CN1023395C - Praparation of hydrocarbons from hydrocarbons containing at least four carbon actoms by hydrogenation and isomerisation - Google Patents

Abstract

The present invention relates to a chemical process involving a processing step which is sensitive to the presence of at least one component contained within the stream to be processed and to an economical and efficient method of temporarily removing such deleterious component from the stream so as to have the deleterious component by-pass the step which is sensitive to this component using an adsorbent for such removal wherein the adsorbent is regenerated by the product effluent stream leaving the sensitive processing step.

Description

Praparation of hydrocarbons from hydrocarbons containing at least four carbon actoms by hydrogenation and isomerisation

This application is the subsequent application of the No.022136 application case of application on March 5th, 1987, therefore the content of original application can be combined reference.

The present invention relates to the chemical technology field, especially relate to a kind of chemical technology method, it comprises one to the highstrung operation steps of at least a component in the processed materials flow, and relate to the method for from materials flow, temporarily removing this unwanted component, even unwanted component is walked around the step to this component sensitivity.

In many chemical technologies, having an operation steps at least is responsive at least a component that contains in the feedstream, or is responsive to a component that results from responsive step upstream.Generally say, the existence of this step need with unwanted component before introducing the sensitive operation step all or major part remove.

The operation steps of this sensitivity can comprise all unit operations in the chemical engineering practice basically.Therefore, many chemical technologies do not allow specific components to be present in the feedstream.For example, use film separation of methane from the Sweet natural gas that contains condensable pentane, hexane a kind of technology that comes to this, pentane and hexane are deleterious to film.Equally, use in the chemical reaction of catalyzer at those, catalyzer generally is responsive to different chemical compositions, and this sensitive catalyst for example comprises the ferric oxide catalyst that is used for synthetic ammonia, and it is responsive especially to carbon oxides.Do not remove these unwanted components from reaction zone, these catalyzer will be poisoned, and reaction just can not be carried out, or carry out bad, perhaps produce complete unwanted pair of reaction.

Chemical reaction is not that some component exists the unique occasion that causes harmful result.For example, when making spent ion exchange resin, before materials flow enters ion-exchanger, often need from processed materials flow, remove some component.Some component is serious interfering ion exchange process in the feedstream, or its use of completely destroy.More particularly, for example, in the ion exchange method water treatment, replace calcium ion with potassium ion, the sodium ion that exists in the current is deleterious to ion exchange process, sodium ion need be removed in the upstream of technical process.

Even in some distilation steps, particularly when component distillation, some component is deleterious for separation and azeotropic solution successfully in the processed fluid.Therefore, require before distilation steps, these components to be removed.This is effective equally for other unit operation, as the unidirectional absorption that utilizes the material of zinc oxide one class to carry out.

No matter relate to any sensitive operation step, obviously all must and adopt some steps, before entering responsive step, materials flow removes unwanted component wherein.

Yet in some cases, unwanted component is unharmful fully to the finished product.Because at least one responsive step is arranged, must adopt some devices to remove this component in technical process, will spend a large amount of funds to purchase required separating device usually, the entire operation expense has also increased simultaneously.

In addition, no matter adopt which device to remove unwanted component in the processed materials flow, all need to handle in the tripping device this and remove component.Therefore, typical in sulfide when the solid adsorbent that utilizes oxide type is removed unwanted component, such sorbent material also is not easy regeneration.Therefore, need change sorbent material frequently, and handle the final waste material of oxide compound that carries full sulfide with sizable expense.

When utilizing fluid to remove unwanted component, these fluids also will be regenerated with other fluid in order to continue to use.This not only increases the expense of whole flow process, but also must supply with this regenerative fluid sufficiently.When utilizing reproducing adsorbent such as molecular sieve, be exactly this situation,, must be provided at the purge gas under the suitable regeneration temperature sufficiently for desorb unwanted component from sorbent material.In some specific factory, this is not to accomplish.Equally, in case sorbent material was regenerated with purgative gas, also must handle the purgative gas that is full of unwanted component.This purgative gas that burns is always unfeasible or meet the requirements.

A kind of special common toxic component is sulphur and compound thereof.In many industrial flows, all produce sulphur.For various reasons must be removed desulfuration or sulfocompound from process fluid constantly.For example, when process fluid acts as a fuel burning, desulfuration must be removed, from fluid to prevent the pollution of the environment.On the other hand, if use the catalyst treatment process fluid, usually need sulphur is removed, to prevent poisoning of catalyst to sulfur sensitive.

There are a variety of methods to be applicable to and from process fluid, remove desulfuration.Most of sulfur removal technology are that air-flow is handled.This technology comprises uses alkaline reagents or amine aqueous solution to remove desulfuration or sulfocompound from this air-flow.On the other hand, can use molecular sieve or other sorbent material, particulate state oxide compound, hydrous oxide or oxyhydroxide as aluminium, zinc, iron, nickel, cobalt etc. can use separately, the use that also can be mixed with each other is perhaps used with other additive such as alkali or alkaline earth metal oxide etc.This has described the processing method of using this oxide compound US3492038.And for example, in US3024868, patents such as 4358297 and 4533529, all discussed and made desulfuration adsorbent with molecular sieve.

Yet the oxide type solid adsorbent is difficult for the original pattern of regeneration usually, when their complete cures, must all abandon.

When using molecular sieve, regenerate with making it, must clean these molecular sieves with hot gas for desorb sulphur content.In many cases, this regenerated feasibility is subjected to the gas quantitative limitation that factories and miness can be used as warm wash gas.

Need remove a kind of concrete industrial flow of sulfur-bearing and nitrogen compound from feedstream owing to used sulfur sensitive and nitrogen sensitive materials in the flow process, be the isomerization of hydro carbons (especially light straight run vapour axle or the light naphthalene) feedstream that contains at least 5 carbon atoms.This feedstream contains sulfocompound and about 0-10ppm of the 200ppm sulphur of having an appointment, the nitrogenous compound of nitrogen substantially.Terminology used here " sulphur " means and comprises sulphur and sulfocompound, and term " nitrogen " means equally and comprises nitrogen and nitrogenous compound.The sulphur of this content and/or nitrogen generally all have adverse influence to the performance and the life-span of isomerization catalyst.Therefore, this feedstream is handled by the sulphur and the nitrogen that adopt hydrodesulfurisationstep step to remove in the materials flow in the upstream of isomerization steps usually.

This hydrodesulfurisationstep step generally comprises the stove formula well heater of an evaporation feedstream; A hydrogenator that sulphur in the materials flow and nitrogen is catalytically converted into hydrogen sulfide and ammonia; The condenser that a gas vulcanization hydrogen and ammonia condensing 30～40% gets off, remaining hydrogen sulfide and ammonia are left away from cat head with feedstream; With one be used for removing the hydrogen sulfide of condensation in the feedstream and the steam stripped tower of ammonia.Generation in the steam stripped tower, also can use hydrogen sulfide and ammonia adsorption bed, this must make materials flow be cooled to suitable temperature before entering adsorber.

No matter be to adopt steam stripped tower or adsorber to remove hydrogen sulfide and ammonia, necessary preheating all except that the hydrocarbon flow of desulfuration and nitrogen, is vaporized it so that enter isomerization reactor basically before again.

This hydrogenating desulfurization technology of removing desulfuration and nitrogen is a kind of effective means for handling the sulphur and the nitrogen that exist, but it is quite expensive.In fact, in common practice, hydrogenating desulfurization unit (also being referred to as hydrogenation) separates independent operation with respect to isomerization unit, and it has increased the complicacy and the total cost of technical process obviously.Equally, because need repeatedly to the feedstream heating and cooling material to be undergone phase transition to adapt to different technical process, this economical efficiency to whole process flow also has adverse influence.

This only is an example.Obviously have a kind of demand in this embodiment, exactly must be cost-effectively be to remove this at least a unwanted component the industrial flow feedstream of responsive step at least a component from containing one.

The applicant has developed a kind of to remove the processing method of unwanted component in the fluid cost-effectively, even unwanted component is walked around the step to this component sensitivity, has eliminated above-mentioned all shortcomings basically.

More particularly, applicant's processing method relates to a kind of unique method of brand-new use sorbent material, in the method, the processed fluid that contains a kind of unwanted component is at first by an adsorption zone that contains solid adsorbent, and this sorbent material can adsorb unwanted component selectively from each component of materials flow under adsorption conditions.The fluid that contains low dense unwanted component enters later processing step again, at last by the operation steps to the unwanted component sensitivity, to produce the product materials flow.This product materials flow at least a portion (opposite with any waste streams of leaving the sensitive operation step) is used as the purgative gas of regeneration adsorption bed.This adsorption bed has carried has expired unwanted component, obtains a kind of product fluid of high density unwanted component under desorption condition.

Therefore, according to the present invention, can realize a kind of chemical technology method that contains the operation steps of specific components sensitivity in cost-effective mode.Therefore, as long as there is a kind of sorbent material that can from materials flow, remove one or more components selectively just passable, utilize this sorbent material in the method for the invention, need not provide washing fluid from the outside, the waste fluid that also is not limited to use the adsorbent reactivation process to produce carries out the regeneration of this sorbent material, the sufficient supplies of the regenerative fluid of this purpose of just having avoided being used to regenerating and the difficulty of processing.Processing method of the present invention provides good solution, be actually after carrying out the responsive step of this technology under the condition that does not have unwanted component to exist, utilize the product materials flow itself to make washing fluid again, under this unwanted component of needs was present in situation in the product fluid, this was particularly advantageous.

To there is the very favorable special case of unwanted component in the product materials flow is the acrylic acid technical process of preparation.Such technical process always is included in the reaction to propylene and oxygen under the catalyzer existence of sulfur sensitive.Because the boiling point of propylene and the boiling point of sulfocompound (as hydrogen sulfide, carbonyl sulfide etc.) are very approaching, so it is always quite difficult and costliness to remove deleterious sulfide.Yet,, make the feedstream that contains propylene and sulfide by to sulphur (with respect to propylene) sorbent material selectively according to the present invention.Then, there are not the propylene of sulfide and oxygen reaction to form the acrylic products fluid basically.After this remove sulfocompound on reproducing adsorbent and the desorb sorbent material with this product fluid again.Here be not that propylene and sulfide are mixed, but vinylformic acid and sulfide mix.Because about 110 ℃ of the boiling-point difference of vinylformic acid and sulfocompound, so two kinds of components are easy to separately, the present invention is feasible.

In addition, the present invention also has an advantage.Because the responsive step in the technology always relates to pyritous and uses, in case when no longer there is unwanted component in fluid by this operation steps, desired temperature when the fluid of Pai Chuing is in the sorbent material desorb basically thus.Therefore, when discharging fluid when returning adsorption bed again and being used as the regenerated washing fluid, do not need to increase this fluidic expense of heating usually, the result has further saved funds again.

As a kind of practice mode, for the continuity of adsorption step is provided, to adopt two adsorption zones at least, have at least district's adsorption plane to have another district's desorb at least.These zones in use change every now and then or by turns, have so just prevented to be adsorbed penetrating of unwanted component.By this way, the feedstream that contains one or more unwanted components flows to adsorption zone continuously, and the fluid of discharging from adsorption zone flows through at least one responsive step the technical process continuously, and at least a portion is passed through desorption zone continuously.In the suitable moment, promptly adsorption zone carries full unwanted component substantially and before unwanted component penetrates, changes adsorption zone, makes it become desorption zone, and changes desorption zone, makes it become adsorption zone, together with the corresponding conversion of feedstream streamline.

It must be understood that the susceptibility step is passed through in the materials flow that does not need in the present invention to leave adsorption step immediately, also need after the susceptibility step, not use the fluid of this processing immediately, whole or in part as desorb or cleaning medium.In fact, discharge fluid in absorption and can finish one or more processing steps before entering the susceptibility step of technical process, and/or the material of discharging from the susceptibility step also can be finished one or more processing steps before using as desorb or cleaning medium whole or in part.

After the desorb, if desired, contain the product fluid of unwanted component again, can adopt common unit to handle, so that remove unwanted component.

As the 3rd advantage of the present invention, be used as cleaning medium owing to the cycle characteristics of adsorption bed with feedstream, the applicant finds and can use sorbent material under adsorption conditions.Because sorbent material adsorptive power under this condition is very low, this is considered to irrealizable fully in the past.

More precisely, most of sorbent materials are to be used for absorption at low temperatures, at high temperature regenerate.According to the present invention, carry out the adsorption/desorption operation with the circulation of enough frequent timed interval and penetrate preventing, even be generally used for to operate adsorption bed under the regenerated high temperature.Owing to can under high temperature or low temperature, use sorbent material, also provide additional unit and increase expense to the optimum temps that is suitable for the sorbent material stalling characteristic with regard to being no longer necessary for the temperature that reduces feedstream.

Therefore, the most widely in the embodiment, feature of the present invention is as follows at its great majority:

A kind of method that the fluid that comprises a kind of component is at least handled, the product that obtains contain said at least a component or its chemical derivative, and described fluid contains at least a other deleterious component at least one operation steps, and this method comprises:

A) under adsorption conditions, fluid is contacted with sorbent material, adsorb at least a other component (with respect to this at least a component) selectively, obtain a kind of absorption phase that has reduced at least a other concentration of component and discharge fluid;

B) ejecta of use absorption phase at least one operation obtains product fluid; With

C) under desorption condition, at least a portion product fluid contacts with the sorbent material with at least a other component that is adsorbed, and with reproducing adsorbent, obtains containing the desorption phase ejecta of at least a other component of high density.

In embodiment than feature of the present invention, applicant's processing method relates to a kind of method of novel use hydrogen sulfide adsorbent.At first the sulfur catalysis in the hydrocarbon feed stream is transformed into hydrogen sulfide, then, by containing the adsorption zone of sorbent material, adsorption of hydrogen sulfide (with respect to hydrocarbon feed stream) selectively obtains the hydrocarbon feed stream of low levels hydrogen sulfide to whole feedstream with high-temperature gas.And then the hydrocarbon feed stream that makes low levels hydrogen sulfide generally is a catalytic reaction zone by the sulfur sensitive step in the technical process.After this make purgative gas carries full sulphur with regeneration adsorption bed with the hydrocarbon product stream that produces again.

Different with prior art, existing hydrogen sulfide adsorption technology is that the hydrocarbon flow that contains gas or liquid curing thing passes through adsorption zone, general about 15 °-93 ℃ of temperature range under lower temperature.In the present invention, the hydrocarbon feed that contains gaseous state sulfide is at high temperature by adsorption zone, and this temperature is generally 120 °-315 ℃ more than the dew point of feedstream.This temperature is generally used for purge gas desorb hydrogen sulfide from the sorbent material in prior art.

Beyond thought fully is that the applicant finds that raw material still can use hydrogen sulfide adsorbent effectively when high temperature.And the known by everybody fact is that this hydrogen sulfide adsorbent is removed hydrogen sulfide under such high temperature ability is very low in this area.Particularly applicant's invention constantly makes sorbent material adsorb and desorb, especially makes cleaning medium with feedstream, in fact can at high temperature utilize these sorbent materials really.Therefore, in common hydrogen sulfide adsorption step, adsorption bed can be in absorption phase in 8-24 hour.In the present invention, hydrogen sulfide absorption only continues 0.5-6.0 hour before adsorption bed converts the desorb working order to.

One of many advantages of this particular embodiment of the present invention are at high temperature to carry out the desulfurization of feedstream, thereby do not need to have earlier the desired gas compressor of hydrogen sulfide adsorption technology, well heater and water cooler and consequent expense.In this, the present invention makes feedstream pass through adsorption zone after the sulphur in the feedstream is transformed into hydrogen sulfide at once, and then enters the sulfur sensitive reaction zone, and this district is general to use sulphur sensitization perception catalyzer, and needs high temperature usually.Can make feedstream not need condensation from an operation steps to another operation steps, this obviously is useful economically.

And, utilize hydrocarbon product stream to remove hydrogen sulfide on the desorb sorbent material as purgative gas, this discharge fluid has been the desired high temperature of desorb generally.This be since it from the sulfur sensitive reactions steps, this does not just need to provide from the outside and not only heats but also the purgative gas of sufficient supplies.Here, owing to purge gas itself is exactly processed feedstream and often is under the best desorption temperature, so supply is always competent.

And, because outside purge gas no longer is provided in system, thus also bring impurity into and hydrocarbon feed stream is produced the situation of pollution with regard to not existing by exterior washings gas.

Also have,,, what no matter is removed at adsorption zone according to the present invention, all can be not only convenient but also turn back to hydrocarbon fluid effectively again.Desulfurization only be since exist one or more sulfur sensitive operation steps rather than because sulphur to the deleterious occasion of the finished product, this is particularly advantageous.Therefore, can allow sulphur is arranged where in the finished product, this particular embodiment that the present invention temporarily removes desulfuration can satisfy the needs of product, thereby has saved needed extras of permanent desulfurization and expense.

In addition, sulphur is under the deleterious situation in the finished product, has been the sulphur of hydrogen sulfide form, can be easy to and remove from the refrigerative the finished product at an easy rate.

In general, the present invention has the particular embodiment in desulfurization can characterize as follows:

The hydrocarbon that contains hydrogen sulfide transforms in the reaction zone that is suitable for transforming to produce the processing method of hydrocarbon product, this conversion is subjected to the harmful effect of hydrogen sulfide, described processing method is carried out under the condition that is suitable for transforming, comprise and keep hydrocarbon effectively and hydrocarbon product is the gasiform temperature and pressure substantially, this processing method comprises:

(a) be under the gasiform temperature being enough to keep hydrogen sulfide containing hydrocarbon, make it feed at least one but be not whole (at least two) adsorption zones, this district contain to hydrogen sulfide absorption (with hydrocarbon phase relatively) have an optionally solid adsorbent;

(b) contain the hydrocarbon of a small amount of hydrogen sulfide from least one adsorption zone discharge that receives hydrocarbon, and make this hydrocarbon feed reaction zone, have the ejecta of product hydrocarbon with production;

(c) be essentially under the gasiform temperature being enough to keep the materials flow that contains the product hydrocarbon, the ejecta that at least a portion is contained the product hydrocarbon feed at least one other adsorption zone do not receive hydrocarbon but to have adsorbed hydrogen sulfide in step (a) from this at least one other adsorption zone desorb hydrogen sulfide, with this at least one other adsorption zone of regenerating;

(d) at least one other adsorption zone is discharged the ejecta of hydrogen sulfide containing product hydrocarbon from this;

(e) end hydrogen sulfide containing hydrocarbon is fed at least one adsorption zone, and (c) this at least one adsorption zone of regenerating set by step, at least one adsorption zone of regenerating at least one adsorption zone utilized as step (a).

In a preferred embodiment, the isomerization process flow process that a particularly advantageous application of the present invention is above discussion.According to the present invention, can incorporate the hydrodesulfurizationsection section in the technical process into the isomerization section, to obtain a kind of new, simplify, economical and effective processing method.This has just saved effectively when required a lot of equipment during these two workshop section independent operatings in the whole technology.

Therefore, this new, simplify and the isomerization process that merges in, contain the hydrocarbon feed stream that carries the sulphur component and/or carry nitrogen compound and at first add thermosetting steam, and then by the hydrogenation catalyst reactor, change into hydrogen sulfide at this sulphur,, then transform ammonification if nitrogen is arranged.The carburet hydrogen raw material that contains sulphur (with the hydrogen sulfide form) and nitrogen (with the form of ammonia) is leaving hydrogenator under the same temperature when entering basically, if desired, a little after the cooling, feed the adsorption zone that at least one is full of sorbent material again, under the temperature and pressure condition of adsorption zone, this sorbent material is adsorption of hydrogen sulfide and ammonia from feedstream optionally.These hydrogen sulfide/ammonia adsorbents also can be removed the moisture content in the feedstream, and this isomerization steps to the back is good.This is because sulphur/nitrogen sensitive catalyst of here using also is responsive to water on less degree.

Basically there is not the hydrocarbon feed of hydrogen sulfide and ammonia to feed isomerization reactor subsequently.If necessary, after the heating, hydrocarbon is by isomerization slightly.Then with the adsorption bed that carries full hydrogen sulfide and/or ammonia in the isomerized product hydrocarbon ejecta desorb adsorption process in front.Because the pressure in the isomerization reactor descends and temperature rises, and has improved the efficient of isomerization hydrocarbon as purge gas.Yet must be pointed out that the present invention does not need isomerization steps to be right after behind adsorption step, same, do not need desorption procedure to be right after behind isomerization steps yet.Between absorption and isomerization steps and/or isomerization and desorption procedure, can carry out the operation steps of any amount to the hydrocarbon ejecta.

The isomerization product ejecta of hydrocarbon contains now by the hydrogen sulfide of desorb and/or ammonia, if necessary, can carry out condensation to remove excessive hydrogen from circulation, carries out flash distillation or stabilization treatment then to remove hydrogen sulfide and/or ammonia.

Just as previously pointed out, adsorption/desorption step of the present invention is actually round-robin.When an adsorber is uploaded full hydrogen sulfide and ammonia substantially, begin to enter the desorb operational stage, and a bed of just having regenerated enters adsorption operations simultaneously, this will change the flow direction of hydrocarbon flow by means of a series of valves.

Because the cycling time of adsorption/desorption is shorter, desired sorbent material volume is little more a lot of than the volume of isomerization reactor in these.Owing to saved the expensive device in common hydrogenating desulfurization/isomerization process flow process, as stove formula well heater, steam stripped device and relative parts, recycle compressor or the like, the savings of acquisition is considerably beyond setting up the expense of smaller hydrogen sulfide/ammonia adsorption bed.

Needs in preferable embodiment of the present invention, have been eliminated to common hydrodesulfurizationsystem system, and the while has been simplified whole isomerization process flow process greatly, economic benefit is improved, and has not only reduced the fund consumption to equipment, and has reduced the working cost of whole technology.This mainly is owing to reduced equipment and reduced the required heating and cooling amount of ordinary skill.

The processing method of the preferable embodiment of the present invention characterizes as follows:

A kind of feedstream that makes the hydrocarbon that contains four carbon atom at least and contain sulphur and/or nitrogen component at least carries out hydrogenating desulfurization and isomerized processing method, comprising:

(a) provide the hydrocarbon feed fluid with certain temperature, contain that enough molecular hydrogens become hydrogen sulfide with the contained whole sulphur components of catalyzed conversion and contained whole nitrogen components become ammonia, said temperature is enough to guarantee that hydrocarbon feed stream is essentially steam state;

(b) hydrocarbon feed stream with step (a) heating feeds the catalytic reaction zone that contains the significant quantity catalyzer, under the condition that forms hydrogen sulfide and ammonia, sulphur in the hydrocarbon feed stream and nitrogen all form hydrogen sulfide and ammonia, produce the hydrocarbon feed fluid that contains hydrogen sulfide and/or ammonia thus;

(c) temperature of keeping the hydrocarbon feed stream of sulfide hydrogen and/or ammonia is enough at least guarantee that this materials flow is in steam state, and with at least one adsorption zone at least two adsorption zone groups of this fluid feeding, wherein each adsorption zone adsorbs and desorb subsequently in turn, and each adsorption zone all contains the solid adsorbent of alternative adsorption of hydrogen sulfide and ammonia, thereby obtains containing the hydrocarbon feed fluid of low concentration hydrogen sulphide and/or ammonia;

(d) contain the hydrocarbon feed stream of low concentration hydrogen sulphide and/or ammonia from least one adsorption zone discharge, and make its feed the isomerization reaction zone that contains the q.s isomerization catalyst, under isomerisation conditions, produce the ejecta that contains isomer;

(e) discharge from isomerization reaction zone and contain the ejecta of isomer, and make it be passed into another adsorption zone being enough to keep under the temperature that this materials flow is a steam state, with desorb hydrogen sulfide and/or ammonia, the ejecta that obtains containing hydrogen sulfide and/or ammonia and contain isomer;

(f) discharge the ejecta that contains hydrogen sulfide and/or ammonia and contain isomer from another adsorption zone of step (e).

The invention provides a kind of fabulous, simple and exquisite method of temporarily removing unwanted component from fluid, make unwanted component walk around operation steps to this component sensitivity, this is most economical and efficient manner.

Fig. 1 is the system flowchart of the most extensive embodiment of the present invention, the processing step of two adsorbers and a convection cell component sensitivity shown in the figure, and comprise a valve control system, it can make the adsorption bed circulation.

Fig. 2 is the system flowchart of the preferred embodiment of the invention, and hydrocarbon feed stream is through isomerization steps.

Fig. 3 is the system diagram of another embodiment of the invention, and wherein adsorption zone and catalytic reaction zone are combined in the container.

With reference to Fig. 1, it has described simple form of the present invention.The part of the chemical technology of only having drawn here, it contains a processing step to one or more component sensitivities in the processed fluid, contain in the raw material the deleterious at least a component of at least one step in the technical process and at least a other component that must in responsive processing step, handle, this raw material enters pipeline 200, it can be the raw material of whole chemical technology, and contained unwanted component, it also can be the central fluid of whole technology, handle at one or more processing step, wherein produced unwanted component.In both cases, this fluid all must be handled before entering responsive step, to remove one or more unwanted components.

After entering pipeline 200, this feedstream enters valve combination device 500 again.In valve combination device 500, valve 510 and 514 is opened, and valve 512 and 516 cuts out.The materials flow that contains unwanted component enters adsorption bed 518 by driving valve 510.

Adsorption bed 518 contains a kind of sorbent material, and this sorbent material is selectively (to compare with remaining ingredient in the materials flow) to one or more unwanted components in the materials flow.Be liquid or gas and be what unwanted component according to materials flow, selected adsorbent.The also temperature of feed fluid with due regard to.The temperature that enters the feedstream of sorbent material should be the temperature that meets the requirements most, promptly in the temperature of aspect the easy and selectivity of sorbent material selectivity being removed unwanted component the best.Yet, described as beginning, because characteristic of the present invention is used sorbent material under the non-optimum temps that can cause in the rapid circulation owing to adsorption/desorption.

The technician in adsorption technology field knows, be by the specific sorbent material of concrete application choice.In general, can optionally adsorb in the feedstream one or more unwanted components and can all can be used as sorbent material in the present invention by any sorbent material of usefulness fluid medium regenerated.All be applicable to the present invention as sorbent materials such as molecular sieve, silica gel, gac, activated aluminas.With reference to Donald W.Breck " zeolite molecular sieve " (John Wiley ﹠amp; Sons 1974) book, this book has been described the application and the selection of zeolite adsorbents, here can be for referencial use.

For example, the ammonia in the hydrocarbon fluid after the available 3A type zeolite adsorbents absorption hydrodenitrification, this technology comprises the step to nitrogen and derivative sensitivity thereof, as resurfacing operation.Equally, 5A type zeolite adsorbents can be used to carbon monoxide or the carbonic acid gas that absorption resembles light gas (Light gas) operation in synthetic ammonia and the urea production, CO/CO ₂Existence be deleterious to the catalyzer of synthetic ammonia or urea.And for example, gac can be used for removing the condensable components in the Sweet natural gas, and when utilizing film from these gases during separation of methane, these condensable components are deleterious to film.

According to different technology and the responsive step that comprises thereof, the contained enough quantity of sorbent of design adsorption bed are to remove at least a unwanted component basically.Equally, can what allow, determine the unwanted component amount of penetrating of being permitted according to responsive step.

Certainly, be to be understood that, if the unwanted component in the feedstream does not have a kind of sorbent material it all optionally can be removed, can use mixed adsorbent, this mixture can be in an adsorption bed, also can be individually in a plurality of beds, the combined effect of these sorbent materials is whole unwanted components can be removed.

The unwanted component that contains lower concentration from the adsorption stage ejecta of adsorption bed 518 discharges.This fluid enters pipeline 220, then by 520 represented susceptibility processing steps among Fig. 1.

This sensitivity step can comprise with or without the chemical reaction step of sensitive catalyst; Distilation steps; Ion-exchange; Non-regeneration sorbing agent or sorbent material; Film separation unit etc.

The discharge fluid of absorption phase obtains the product ejecta through behind the responsive processing step.Wherein a part enters pipeline 230, and remainder enters pipeline 250.The product ejecta that enters pipeline 230 is abundant, so that be used as cleaning medium regeneration adsorption bed 522 effectively, this bed is in desorption phase, and carrying in last absorption phase has expired unwanted component.

Though not shown among Fig. 1, responsive step also can produce second kind or refuse and discharge fluid, their generation is not the purpose of whole process flow, and purpose is to produce the product ejecta, and it contains former exist and through the component of responsive step process in feedstream.This component can exist with more purified form, also can be used as reactor product.Therefore, in resurfacing operation, it is exactly reformate that product is discharged fluid.According to the present invention, this fluid is used as the cleaning medium of inefficacy adsorption bed.For example, at distilling period, the fluid that is used as cleaning medium can be the product of purifying.Equally, in isomerization reactor, isomerization product also can be used as the regenerating medium of inefficacy sorbent material.Therefore, just as used herein, the product ejecta contains the original component that exists and crossed in responsive step process in the feedstream, perhaps contains the reactor product of this component, and its production is the purpose of whole process flow.In technical process of the present invention, this just product ejecta is used as the desorb medium of inefficacy adsorption bed whole or in part.

Remove on guaranteeing effectively with sorbent material under the desorption condition of unwanted component and carry out desorb, reproducing adsorbent uses so that continue.Say generally, contact with wanting the regenerated sorbent material at once that normally to guarantee suitable desorption temperature, this is because responsive processing step will carry out to fluid temperature (F.T.) under the condition that improves temperature as the fruit product ejecta.Yet,, on the other hand,, can use the heating unit (not shown) that the temperature of product ejecta is brought up to suitable desorption temperature if temperature is not too high if between 520 responsive step and adsorption bed 522, inserting step is arranged.

The technician of adsorbing domain knows the optimum operation condition of absorption and desorb, and is easy to determine.

After adsorption bed 522 regeneration, the stripping stage discharge fluid that contains high dense unwanted component leaves this bed by pipeline 240, and enters valve member 500, enters pipeline 300 again by valve 514, perhaps, perhaps in whole chemical technology, proceed to handle as product.

After operation for some time, adsorption bed 518 will carry full unwanted component, and adsorption bed 522 has obtained regeneration simultaneously.At this moment, the valve of regulated valve subassembly 500, shut-off valve 510 and 514 is opened valve 512 and 516.Therefore, feedstream 200 flows through pipeline 240 and enters adsorption bed 522 absorption unwanted components oppositely by this system, then enters responsive step 520, enters Regenerative beds 518 subsequently, leaves system by valve 512 and pipeline 300 at last.

Adsorption bed is converted to stripping stage or stripping stage is become capacity and the adsorption conditions that the time length that continues before the adsorption stage depends on concrete sorbent material, unwanted component, sorbent material, and they all correspondingly change.Generally speaking, the time cycle that adsorption bed is remained on adsorption stage is less than the time that unwanted component penetrates, and for those skilled in the art, this is easy to determine.

The preferred embodiments of the invention shown in Figure 2 are described below.As mentioned above, be understood that the present invention never is limited to such embodiment.

With reference to Fig. 2, the liquid starting material hydrocarbon that contains sulphur, sulfocompound, nitrogen and/or nitrogenous compound arrives pump 102 by pipeline 10, sends into heat exchanger 104 by pump earlier by pipeline 12.

In this isomerization process flow process, hydrocarbon feed stream contains at least 5 carbon atoms usually, mainly be that light straight run divides gasoline, light naphthalene, natural gasoline, lightweight hydrocracking thing or lightweight reformate, they generally contain 0-400ppm sulphur and 0-100ppm, be generally the nitrogenous compound of 0-10ppm.Yet in general, the formation of feedstream is unimportant among the present invention, as long as sorbent material can optionally be removed hydrogen sulfide and/or ammonia from the component of hydrocarbon feed stream.

In heat exchanger 104, feedstream generally is heated to 93 °-260 ℃, is preferably 150-230 ℃, and then sends into well heater 106 by pipeline 14.

Well heater 106 is heated to phase transformation with material flow becomes vapour phase, to satisfy the requirement of back processing step.Say that generally the temperature of leaving the unstripped gas of well heater 106 is 260 °-315 ℃, be preferably 290 °-315 ℃, pressure is 14-50 kilogram/square centimeter.Well heater 106 is well-known types, is used in hydrogenating desulfurization/isomerization process usually.

The vapour phase raw material that comes out from well heater 106 is transported to hydrogenator 108 by pipeline 16.Here, in the feedstream contained sulphur and sulfocompound, nitrogen and nitrogenous compound in the presence of the catalyzer that is fit to H-H reaction, generation hydrogen sulfide and ammonia.This hydrogenation reaction also is well known to those skilled in the art, and normally used typical hydrogenation/isomerization process is for example discussed in US4533529.Say that generally the hydrogenation of sulphur and nitrogen compound carries out under 260-345 ℃ in reactor 108, this depends on the source of selected condition and hydrogen.Used catalyzer is to contain the metal of V B, VI B, VIII, family in the Mendeleev chart and the catalyzer of rare earth element, sees " periodic table of elements " of " chemical engineering handbook " the 5th edition announcement, perry and Chilton.Catalyzer can have carrier, also can be without carrier, but be preferred with the catalyzer of refractory inorganic oxide such as silica, aluminium stone or silicon-aluminium masonry carrier.These preferred catalyzer contain one or more metals as metal oxide or sulfide adding, as cobalt, molybdenum, iron, chromium, vanadium, thorium, nickel, tungsten and uranium.Typical hydrogenation catalyst comprises: shell 344Co/Mo(shell chemical company, Houston, Texas), C20-5, C20-6, C20-7, C20-8Co/Mo hydrogenation catalyst (united catalyst company limited, Louisville, Kentucky) or the like.

After sulphur in hydrocarbon feed stream and/or nitrogen convert hydrogen sulfide and ammonia respectively to, the materials flow in the reactor 108 under identical with when inlet basically temperature by pipeline 18 and enter at least one hydrogen sulfide/ammonia adsorption zone by valve assembly 110 at once usually.Yet if desired, in order to improve adsorption efficiency, it may be favourable cooling off before the hydrocarbon feed fluid that will contain hydrogen sulfide/ammonia is sent into adsorption zone.

To the requirement of valve assembly 110, be that it can suitably control the hydrocarbon feed fluid that flows into adsorption bed 118 and 120, by its be forward or reverse flow cross adsorption bed, make a bed absorption or a desorb.

Though should be noted that accompanying drawing two beds (118 and 120) that only drawn, can use a bed arbitrarily for the adsorption/desorption of this technology.

General hypothesis adsorption bed 118 has just been regenerated, and existing preparation is adsorbed again, indicates the glide path of hydrocarbon feed stream in the accompanying drawing with " A " arrow.Valve 114 and 117 in the valve assembly is shown in an open position, and valve 112 and 116 is in the closed position.The hydrocarbon feed stream that contains hydrogen sulfide and/or ammonia enters pipeline 20 by valve 114, arrives adsorption bed 118 then, and at this, it forward flows through, and sorbent material is optionally removed hydrogen sulfide and/or the ammonia in the feedstream.Basically the hydrocarbon flow of having removed the processing of all hydrogen sulfide and ammonia arrives isomerization reactor 122 by pipeline 22 again.There, in order to obtain the discharge fluid that high-octane gasoline and formation contain the product hydrocarbon, n-carbon is varied to its corresponding isomer, more precisely, becomes a kind of isomer.To adsorption bed 120, this bed carries at last adsorption cycle has expired hydrogen sulfide and/or ammonia to this isomer, now uses the reverse feeding of product hydrocarbon ejecta with Regenerative beds 120, and obtains the hydrogen sulfide and/or the ammonia of whole original bulies again by pipeline 24.The product hydrocarbon ejecta that is loaded with hydrogen sulfide and/or ammonia enters valve assembly 110 once more by pipeline 26, and enters pipeline 28 through valve 117.

As pointing out already, processing method of the present invention does not need the absorption ejecta is sent into responsive step (in this embodiment for isomerization reaction) at once, and the discharge fluid that does not also need to leave responsive step is used for the desorb adsorption bed at once.Therefore, in the embodiment of Fig. 2, can require from the absorption of adsorption bed 118 discharge fluid before entering isomerization reactor at first by containing the guard bed (not shown) of zinc oxide, to remove the trace hydrogen sulfide that may still exist in the fluid.Equally, after leaving isomerization reactor and enter adsorption bed 120 and carry out before the desorb, also can make isomer pass through a separator (not shown) earlier as distillation tower, adsorbent of molecular sieve etc., isomer and not isomerized hydrocarbon fluid are separated, and then utilize the isomer fluid adsorption bed 120 that goes to regenerate, and looping back isomerization reactor again, further handles hydrocarbon fluid.

After finishing adsorption cycle, generally be before hydrogen sulfide and/or ammonia penetrate adsorption bed, the bed that will carry out adsorption operations is converted to desorb, and the bed that carries out desorb is converted to adsorption operations.As above mentioned, owing to hydrogen sulfide/ammonia adsorbent at high temperature uses, and this temperature only is used for desorb in the past, so the capacity of these sorbent materials is lower.So in order still to use these sorbent materials, loop cycle must be lacked, adsorption bed can be kept general about 0.5-6.0 hour of the time of continuous adsorption operation, is preferably 1.0-2.0 hour.In a single day adsorption cycle is finished, and is exactly the time of bed 118 with desorb, bed 120 beginning adsorption operations, thereby opens valve 112 and 116, simultaneously shut-off valve 114 and 117.The flow circuits of feedstream has promptly been put upside down the direction that flows through adsorption zone and isomerization reactor shown in arrow among the figure " B " at this moment, forward flows through the bed 120 that adsorbs, and the bed 118 that carries out desorb is crossed in reverse flow.

Though in this embodiment, the circulation of adsorption bed makes the fluid reverse flow cross isomerization reactor, should be appreciated that the present invention also comprises a kind of like this embodiment, promptly can make hydrocarbon feed stream cross reactor 122 with a direction Continuous Flow by the additional valve (not shown) of suitable arrangement.

Hydrogen sulfide/ammonia adsorbent of using in the adsorption bed must be optionally hydrogen sulfide and/or ammonia in the adsorbed hydrocarbons materials flow, and can bear temperature and pressure in the adsorption bed.General adsorption temp scope is 93-260 ℃, is preferably 150-232 ℃, and pressure is 14-50 kilogram/square centimeter.

Though the temperature of adsorption zone approaches the temperature in the isomerization reactor substantially, but still may need and will not have the hydrocarbon feed stream of hydrogen sulfide and ammonia to heat before sending into reactor, to satisfy the isomerization reaction temperature that is fit to.

This embodiment can be used any sorbent material, as long as it can optionally remove hydrogen sulfide from the fluid remaining ingredient and/or ammonia is just passable.The sorbent material that is particularly suitable for the technology of the preferable embodiment of the present invention and can removes hydrogen sulfide and/or ammonia well under the high temperature of sorption cycle is 4A type zeolite molecular sieve and clinoptilolite.

Term " zeolite " refers generally to one group of natural and synthetic hydrated metal silicon-aluminate, and wherein many is crystalline structure.Yet, on chemical constitution, crystalline structure and physical property such as X-ray powder diffraction pattern, have tangible different between the various synthetic and natural materials.

The structure of crystal zeolite molecular sieve can be described a kind of SiO of unlimited three-dimensional framework ₄And AlO ₄Tetrahedron, this tetrahedron is crosslinked by shared Sauerstoffatom, thus the ratio of Sauerstoffatom and aluminium Siliciumatom sum is 2.Contain the tetrahedral load valency of aluminium and come balance by the foreign material in the negatively charged ion crystal, as basic metal and alkaline-earth metal ions, as if sodium, potassium, calcium and magnesium ion adopt ion exchange technique, a kind of positively charged ion can change another kind into.

With the combination water in the zeolite all remove can make it the activation.The space that stays in the crystal of activation back is suitable for the absorption of adsorbate molecules.This space only is suitable for size, shape and energy and allows adsorbate molecules to enter the absorption of the molecule in the molecule sieve aperture.

The 4A zeolite is the A type zeolite of sodium cation type, and its aperture is about 4A.Its preparation method and its physicochemical property have been made detailed description in US2882243, can be used as reference here.

Other sorbent material that also is applicable to this preferred embodiment of the present invention comprises that the aperture is at least 3.6

Those sorbent materials of (the kinetic energy diameter of hydrogen sulfide).These sorbent materials comprise 5A zeolite, 13X zeolite, gac or the like.These sorbent materials are well-known, generally are used for the absorption of hydrogen sulfide/ammonia, and just used temperature is lower in the preferred embodiment of the invention.

As preventive measure, as mentioned above, after adsorption zone and before the isomerization reactor, also can require additional little, easy zinc oxide guard bed (not shown), to guarantee not exist the possibility that remaining any hydrogen sulfide penetrates or system is not normal.

Isomerization reactor 122 is well-known in the art general isomerization reactors, contains the isomerization catalyst of catalytically effective amount, to improve the isomer concentration of hydrocarbon discharging current.Isomerization reaction is generally carried out under 250-282 ℃.The fluid temperature (F.T.) of leaving reactor is generally a little more than the temperature that enters reactor, and is high approximately 3-23 ℃.Because reactor temperature rises and pressure descends, discharge the efficient of fluid as purge gas thereby improved.

Though in this preferred embodiment, be the catalyzer of isomerization reactor to the processing step of sulphur and nitrogen sensitivity, the present invention also is applicable to any other processing step to sulphur and/or nitrogen sensitivity, wherein utilize above-described particular cycle adsorption system absorption sulphur.

The product that contains hydrogen sulfide and/or ammonia is discharged fluid by pipeline 28, is cooled in heat exchanger 104, and then feeds separator 124 by pipeline 30.In separator 124, produce overhead fraction and a kind of liquid hydrocarbon isomer phlegma of excess molecular hydrogen.Hydrogen leaves separator 124 by pipeline 32, is divided into two fluid streams by pipeline 34 and 36 then.

Pipeline 34 is recycled in the feeding line 12 hydrogen, and reacting for the formation of hydrogen sulfide and ammonia provides excessive molecular hydrogen.Add the hydrogen that replenishes by pipeline 52.

As another embodiment of the present invention, pipeline 36 provides hydrogen, by pipeline 38 or 40, it is mixed with isomer respectively, to strengthen the desorption procedure of back.Generally discharge and add the 0-50%(mole in the fluid to hydrocarbon) hydrogen.

The product hydrocarbon isomer that leaves the condensation of separator 124 enters stabilizer 126 by pipeline 42.In stabilizer 126, flash distillation hydrocarbon isomer is to remove contained whole hydrogen sulfide and/or ammonia and C ₁-C ₄The lightweight final product that gas is such makes it as overhead fraction, leaves stabilizer by pipeline 44.Part overhead fraction returns material feeding tube 12 through pipeline 46 recirculation, and remaining discharges from system through pipeline 48.Final isomer product is discharged from stabilizer 126 by pipeline 50.

Replace and separately use adsorber and the such catalyticreactor of isomerization reactor,, also can make these process combination in the technical process in a container, as shown in Figure 3 as another embodiment of the present invention.Here, sorbent material is placed 11 and 19 districts of container 23, and the catalyzer that carries out the responsive processing step of sulphur and nitrogen is placed on 15 districts of container.Feedstream is entered by pipeline 3, is perhaps entered by pipeline 5, and flow circuits is respectively with shown in arrow A or the B, and this depends on adsorbent zone and is in adsorption operations or desorb operation.

Embodiment

Example 1

Treat that isomerized hydrocarbon feed stream contains 70ppmw sulphur (in various sulfocompounds) and 3ppmw nitrogen (in various nitrogenous compounds).The charging of per minute 40CC (density is 0.65g/CC, is equivalent to 26g/min) is sent in the hydrogenation bed that 300 gram C20-8Co/Mo hydrogenation catalysts are housed, and the weight hourly space velocity of hydrogenation reaction (WHSV) is 5.2.

The fluid that has now contained hydrogen sulfide and ammonia is sent into 400 gram 4A type zeolite (apertures about 4 is housed

) adsorber in.Utilize highly sensitive gas-chromatography (can differentiate the sulphur that is lower than 0.1ppmw) to come the track of sulphur in the Monitoring systems.Thief hole is located at the entrance and exit place of adsorption bed.

After being heated to 260 ℃, fluid sends into isomerization reactor.This isomerization reactor be equipped with 945 gram HS-10 isomerization catalysts (CT), the weight hourly space velocity of generation is heavy hour of 1.65[feed weight/catalyzer for Union Carbide Corporation, Danbury].The isomer that leaves reactor under 260 ℃ of temperature enters the desorb bed subsequently.

In this embodiment, adopt the temperature transition of appropriateness to improve absorption property.System parameter is as follows:

25 kilograms/square centimeter of system pressures (gauge pressure)

302 ℃ of hydrogenation temperatures

177 ℃ of adsorption temps

260 ℃ of desorption temperatures

H ₂/ hydrocarbon (mole) 1.0

Total cycle time (absorption+desorb) 2 hours

In the hydrotreater ejecta in the measurement of sulphur and the nitrogen content proof raw material all sulphur all become hydrogen sulfide and all nitrogen has all become ammonia.Between the round-robin adsorption cycle, no longer can measure sulphur (hydrogen sulfide) or nitrogen (ammonia) in the adsorber discharge fluid.

Circulation is transferred to after the desorb, measure hydrogen sulfide and ammonia content in the desorb discharging current again.To absorption charging and desorb ejecta, carry out sulphur and nitrogen content integration to the time.Prove that relatively whole sulphur and the nitrogen brought into the absorption charging all leave with the desorb ejecta, can determine not have non-steady phenomenon to take place.

Example 2

The hydrocarbon feed that contains 410ppmw sulphur (in various sulfocompounds) is carried out resurfacing operation.The raw material of 40CC/min (density is 0.65g/CC, is equivalent to 26g/min) is sent in the hydrogenation bed that the 300gC20-8Co/Mo hydrogenation catalyst is housed, and the weight hourly space velocity of hydrogenation reaction is 5.2.

The fluid that will contain hydrogen sulfide is sent into 400g4A zeolite (aperture about 4 is housed ) adsorber in.Track with sulphur in highly sensitive gas-chromatography (can differentiate the sulphur that the is lower than 0.1ppmv) Monitoring systems.Thief hole is located at the entrance and exit place of adsorption bed.

After fluid is heated to 480 ℃, enter reformer, still under this temperature, leave reformer.

In this embodiment, utilize spontaneous temperature to improve absorption property.System parameter is as follows:

25 kilograms/square centimeter of system pressures (gauge pressure)

302 ℃ of hydrogenation temperatures

302 ℃ of adsorption temps

480 ℃ of desorption temperatures

H ₂/ hydrocarbon (mol ratio) 1.0

Total cycle time (absorption+desorb) 2 hours

The mensuration of sulphur content proves that all sulphur all is converted into hydrogen sulfide in the raw material in the hydrotreater ejecta.Between the round-robin adsorption cycle, can not monitor out has sulphur to have (hydrogen sulfide) in the adsorber discharging current.

With cyclic transformation is after the desorb, the hydrogen sulfide content of monitoring desorb ejecta.The integration of sulphur content to the time carried out in absorption charging and desorb ejecta.Prove that relatively whole sulphur of bringing into the absorption charging all leave with the desorb ejecta, determine not have non-steady phenomenon to take place.

Example 3

Per hour making, one pound ammonia synthesis gas reaction forms ammonia.The component of synthetic gas is as follows:

N ₂The 24.9%(mole)

H ₂The 74.9%(mole)

CO 500ppmv

CO ₂500ppmv

Utilization contains the adsorber of 450 gram 5A type molecular sieves.Make it to remain on 38 ℃, this is a large amount of CO before ammonia synthesis ₂The temperature out in removal stage.Under this condition, the capacity of 5A type molecular sieve adsorption oxycarbide is a 0.1%(weight).The total flux that oxycarbide flows into bed is 1.95 Grams Per Hours.Therefore, this bed per hour circulates 5 times, has the carbon oxide feed that enough capacity are handled this content.After oxycarbide was saturated, this cleaned with the ammonia product of sending to storage with also uncolled down at 150 ℃.

Claims (9)

1, a kind of hydrogenation and isomerization process method of the raw material hydrocarbon of four carbon atom at least of containing, this raw material contains sulphur and/or nitrogen component at least, and this method comprises:

(a) provide the raw material hydrocarbon of certain temperature and be enough to contained each sulphur component almost all is catalytically conveted to the molecular hydrogen that hydrogen sulfide and each nitrogen component almost all are catalytically conveted to ammonia, this temperature can guarantee effectively that at least raw material hydrocarbon is a vapour phase;

(b) the raw material hydrocarbon mixture of step (a) is sent into the catalyst reaction district of containing the significant quantity catalyzer, under the condition that forms hydrogen sulfide and/or ammonia, almost whole each sulphur component in the raw material hydrocarbon mixture transform into hydrogen sulfide, almost whole each ammonia components in the raw material hydrocarbon mixture transform into ammonia, thereby obtain containing the hydrocarbon gas fluid of hydrogen sulfide and/or ammonia;

(c) hydrocarbon fluid that will contain hydrogen sulfide and/or ammonia maintains 120 ℃-260 ℃ (250 °F-500 °F), the hydrocarbon fluid that this temperature can be enough to keep this sulfide hydrogen and/or ammonia at least is a vapour phase, and it is fed one group of at least one adsorption zone in (at least two) adsorption zone, wherein each adsorption zone all alternately adsorbs with desorb and operates, and each adsorption zone all is equipped with the solid adsorbent of selective adsorption hydrogen sulfide and ammonia (with respect to hydrocarbon feed), thereby obtain the hydrocarbon fluid that hydrogen sulfide and ammonia content have reduced, sorbent material must regeneration behind 0.5-6.0 hour the adsorption cycle;

(d) discharge from least one adsorption zone and contain the hydrocarbon fluid that hydrogen sulfide and/or ammonia content have reduced, and under isomerisation conditions, its feeding is contained the isomerization reaction zone of the isomerization catalyst that is subjected to hydrogen sulfide and/or ammonia disadvantageous effect of catalytically effective amount, obtain containing the ejecta of isomer;

(e) discharge the ejecta that contains isomer from isomery from reaction zone, contain under the temperature that the isomer fluid is essentially vapour phase being enough to keep, this fluid of near small part is passed into another adsorption zone at least, with desorb hydrogen sulfide and/or ammonia, obtain containing the ejecta that contains isomer of hydrogen sulfide and/or ammonia; With

(f) from another adsorption zone at least of step (e) discharge contain hydrogen sulfide and/or ammonia contain the isomer ejecta.

2, according to the method for claim 1, wherein hydrocarbon feed stream contains above hydrogen sulfide and/or ammonia formation reaction and the stoichiometric molecular hydrogen of isomerization, therefore the isomer ejecta that contains that contains hydrogen sulfide and/or ammonia also contains molecular hydrogen, it is characterized in that, handled from the sulfide hydrogen of step (f) and/or the isomer ejecta that contains of ammonia, nearly all hydrocarbon condensation, obtain containing the overhead fraction of excess molecular hydrogen, at least a portion overhead fraction circulation also converges with hydrocarbon feed stream in the step (a).

According to the method for claim 2, it is characterized in that 3, at least a portion overhead fraction converges with the discharge fluid that contains isomer, and is used to the desorb of adsorption zone.

4, according to the method for claim 2, it is characterized in that, the processing that the isomer ejecta removes hydrogen and/or ammonia that contains of the hydrogen sulfide that contains condensation and/or ammonia.

According to the method for claim 1, it is characterized in that 5, the temperature range of sorbent material is 150 ℃-230 ℃ (300 °-450 °F) during absorption.

According to the method for claim 1, it is characterized in that 6, adsorption zone is equipped with 4A type zeolite molecular sieve as sorbent material.

According to the method for claim 1, it is characterized in that 7, adsorption zone is equipped with clinoptilolite as sorbent material.

According to the method for claim 1, it is characterized in that 8, adsorption zone is equipped with 5A type zeolite as sorbent material.

According to the method for claim 1, it is characterized in that 9, adsorption zone must be regenerated behind the 1.0-2.0 hour adsorption cycle.