CN105777476B - A kind of ethylene selection hydrofinishing process - Google Patents
A kind of ethylene selection hydrofinishing process Download PDFInfo
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- CN105777476B CN105777476B CN201410806522.0A CN201410806522A CN105777476B CN 105777476 B CN105777476 B CN 105777476B CN 201410806522 A CN201410806522 A CN 201410806522A CN 105777476 B CN105777476 B CN 105777476B
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Abstract
The present invention relates to a kind of methods that ethylene selects hydrofinishing, for adding the adiabatic reactor reactor of hydrogen to be located at after ethylene rectifying column, before ethylene polymerization device, Pd Pb series catalysts are housed in fixed bed reactors, carrier is alumina series carrier；The catalyst is combined in preparation process, by alumina series carrier with hydroxyl dipyridyl derivatives, and the hydroxyl dipyridyl derivatives being incorporated on carrier form metal complex with active component；Method of hydrotreating using the present invention, the activity and selectivity of hydrogenation reaction are significantly better than traditional method of hydrotreating, and Ethylene purity improves, so as to improve the performance of polymer grade ethylene product very well.The reduction of green oil simultaneously so that the activated centre of catalyst is not covered by by-product, and catalyst activity and selectivity are kept well, and catalyst service life extends；When containing a certain amount of C-4-fraction in hydrogenating materials, catalyst also has excellent Hydrogenation.
Description
Technical field
The present invention relates to a kind of selection method of hydrotreating, especially a kind of method of ethylene selection hydrofinishing.
Background technology
Polymer grade ethylene production is the tap of petrochemical industry, and polymer grade ethylene and propylene are the most bases of downstream polymerisation device
This raw material.The selection of wherein acetylene adds hydrogen to have extremely important influence to ethylene processing industry, in addition to ensureing going out for hydrogenation reactor
Mouth acetylene content is up to standard outer, and the selectivity of catalyst is excellent, can make the generation ethane that ethylene is as few as possible, to improving entire work
It is significant to improve device economic benefit for the yield of ethene of skill process.
Cracking C-2-fraction contains the acetylene that molar fraction is 0.5%-2.5%, when producing polyethylene, lacking in ethylene
Amount acetylene can reduce the activity of polymerization catalyst, and make the deterioration in physical properties of polymer, so must be by the acetylene in ethylene
Content drops to certain limit, could be as the monomer of synthetic high polymer.Therefore acetylene separation and conversion are in ethylene unit flow
One of important process.
Catalysis selective hydrogenation includes front-end hydrogenation and back end hydrogenation in ethylene unit, and ethylene front-end hydrogenation and back end hydrogenation refer to that acetylene adds
For domethanizing column position, hydrogenation reactor is located at before domethanizing column for front-end hydrogenation, hydrogenation reactor hydrogen reactor
It is back end hydrogenation after domethanizing column.It is more and more using two front-end hydrogenation of carbon in current C-2-fraction acetylene hydrogenation
The characteristics of process, the process is hydrogenation reactor before domethanizing column.Front-end hydrogenation is divided into as predepropanization with before
Two kinds of techniques of deethanization.Front-end deethanization hydrogenation technique is that hydrogenation reactor is located at after dethanizer, before domethanizing column.It is preceding de-
Propane hydrogenation technique is that hydrogenation reactor is located at after depropanizing tower, before domethanizing column.The difference of flow brings two kinds plus hydrogen
The difference of material composition.Contain methane, hydrogen, carbon monoxide, C-2-fraction (acetylene, ethylene, second in front-end deethanization hydrogenation material
Alkane)；It is evaporated containing methane, hydrogen, carbon monoxide, C-2-fraction (acetylene, ethylene, ethane), carbon three in predepropanization hydrogenation material
Divide (propine, allene, propylene, propane).
Material in ethylene unit is after Acetylene converter, then again through ethylene distillation, still contains 1 in material
The acetylene of~10ppm, micro CO, the requirement due to polymer grade ethylene product to raw material is higher and higher, adds these impurity
Presence influence whether the performance of ethylene rolymerization catalyst, therefore, it is necessary to by way of selection plus hydrogen, before vinyl polymerization
By the selection hydrogenation and removing acetylene of trace acetylene in smart ethylene feed, its content is made to be reduced to 1ppm or less.
At present in ethylene unit, in smart ethylene feed the selection of trace acetylene add hydrogen mainly use single hop reactor process.
Reactor inlet material forms：Ethylene >=99.99% (Φ), acetylene 1~10ppm of 1~10ppm, CO, hydrogen is using distribution
Mode, H2/C2H2=2~20.1.5~2.5MPa of reaction pressure, 2000~10000h of air speed-1, 25 DEG C~40 DEG C of inlet temperature.
Alkynes and diolefin hydrogenate catalyst are by the way that noble metal such as palladium is supported on porous Inorganic material carrier
On obtained (US4762956).In order to increase the selectivity of catalyst, the green oil that oligomerization generates when reducing by adding hydrogen is led
The catalyst inactivation of cause, the prior art use the method for adding that such as group ib element is co-catalysis component in the catalyst：
Pd-Au (US4490481), Pd-Ag (US4404124), Pd-Pb (US3912789), or alkali or alkaline earth metal is added
(US5488024) etc., carrier used has aluminium oxide, silica (US5856262), loyal green stone of honeycomb (CN1176291) etc.
Deng.
US5856262 is reported using the modified silica of potassium hydroxide (or hydroxide of barium, strontium, rubidium etc.) as carrier,
The method for preparing low in acidity palladium catalyst, in air speed 3000h-1, 35 DEG C of inlet temperature, entrance acetylene molar fraction 0.71%, hydrogen
Under conditions of alkynes molar ratio 1.43, outlet acetylene molar fraction is less than 0.1 μ L/L, and ethylene selectivity is up to 56%.Patent
Using aluminium oxide as carrier, addition co-catalyst silver acts on US4404124 with palladium, is prepared for the C2 hydrogenation catalysis of function admirable
Agent.The catalyst, which has, reduces ethane production quantity, inhibits the acetylene being adsorbed on catalyst surface to carry out partial hydrogenation dimerization anti-
It answers, 1,3-butadiene is inhibited to generate, reduce the characteristics of green oil generates, improves ethylene selectivity, reduce oxygenatedchemicals production quantity,
It is applied widely in ethylene industry.However, above-mentioned catalyst is prepared using infusion process, limited by preparation method
System, metal dispersity is only 30% or so, and there is also many deficiencies for catalyst performance, still there is further improved necessity.
CN101745389A discloses a kind of egg-shell catalyst for preparation of ethylene through selective hydrogenation of acetylene, belongs to oil
(natural gas) chemical products synthesize and new catalytic material technical field, be related to it is a kind of to preparation of ethylene through selective hydrogenation of acetylene have it is excellent
The egg-shell catalyst of good catalytic performance.It is characterized in that with aluminium oxide (Al2O3) bead be carrier, using infusion process prepare activity
Component palladium is in the loaded catalyst of eggshell type distribution, and using Ag to eggshell type Pd/Al2O3Catalyst is modified.Pd is loaded
It is 1~5 that amount, which is 0.01~0.1wt%, Ag and Pd atomic ratio,.The invention has the advantages that the one kind provided is used for second
Alkynes selects the egg-shell catalyst of Hydrogenation ethylene, can be under the conditions of high conversion of alkyne, especially in the acetylene close to 100%
When conversion ratio, high ethylene selectivity is realized.
Traditional Pd-Ag bimetallics selective hydrogenation catalyst is prepared using aqueous solution infusion process.Using sub-dip method
When, a kind of group of branch it is more be enriched in carrier surface, and another component is enriched in outer surface, only part metals atom phase
Mutually infiltration, forms alloy structure.When using total immersion method, due to the interaction of the presoma and carrier of two metal ion species
Difference, surface tension and solvation are hardly formed the uniform load of two kinds of components, also can only partly form alloy structure.
It is often selectively preferable in initial reaction stage when this catalyst is applied to C 2 fraction selective hydrogenation, with the extension of run time,
Selectivity constantly declines, and generally runs 3~6 months and just needs to regenerate, economic loss is larger.
CN201110086174.0 on carrier by adsorbing specific high-molecular compound, in carrier surface certain thickness
Macromolecule wrapped layer is formed, with compound and high molecular weight reactive with functional base, with can be complexed with active component
Function base, complex reaction is occurred on carrier surface function base by active component, ensures active component orderly and height point
It dissipates.Using the patented method, the specific high-molecular compound of carrier adsorption carries out chemistry by the hydroxyl of aluminium oxide with macromolecule
Absorption, the amount of carrier adsorption high-molecular compound will be limited by the hydroxyl quantity of aluminium oxide；By the macromolecule of functionalization
Not strong with the complexing of Pd, activity component load quantity does not reach requirement sometimes, and residual fraction active component is gone back in maceration extract, is made
It is improved at catalyst cost；Preparing C2 hydrogenation catalyst using this method, there is also the disadvantages of technological process complexity.
Invention content
The purpose of the present invention is to provide a kind of methods that ethylene selects hydrofinishing, by selecting active component height point
It dissipates, the Pd-Pb catalyst with height alloy structure, improves hydrogenation activity and selectivity, improve device operation stability
With the performance of polymer grade ethylene product.
The inventors discovered that when the catalyst prepared using the specific method of present invention institute, the Pd in catalyst is divided by Pb
Every so that the spacing in activated centre widens, and two acetylene molecules occur hydrodimerized probability when adding hydrogen and are greatly reduced.1,3- fourths
The production quantity of diene significantly declines, and therefore the surface coking rate of catalyst is greatly reduced, catalyst on-stream cycle time extends,
Economic benefit is apparent.
The present invention provides a kind of methods that ethylene selects hydrofinishing, for adding the adiabatic reactor reactor of hydrogen to be located at ethylene
After rectifying column, before ethylene polymerization device.By the smart ethylene feed of ethylene distillation column overhead, after matching hydrogen, into thermal insulation
Bed reactor carries out selection plus hydrogen, it is characterised in that：Pd-Pb series catalysts are housed, carrier is aluminium oxide in adiabatic reactor reactor
It is carrier, is in terms of 100% by the quality of catalyst, wherein Pd contents 0.025~0.055%, Pb contents are 0.15~1.0%,
The specific surface area of catalyst is 20~60m2/ g, pore volume are 0.15~0.70mL/g；The catalyst passes through in preparation process
Carrier is combined with hydroxyl-bipyridyl, and hydroxyl dipyridyl derivatives form metal complex with active component；Reaction condition
For：25 DEG C~40 DEG C of adiabatic reactor reactor inlet temperature, 1.5~2.5MPa of reaction pressure, 2000~10000h of gas space velocity-1。
The characteristics of Pd-Pb series catalysts used in the present invention is：The catalyst is PdPb- hydroxyls-using the present invention
Bipyridyl/Al2O3Prepared by the method for precursor.
The catalyst preparation process of recommendation, includes at least：Hydroxyl dipyridyl derivatives are loaded into alumina support
On, then pass through the extra hydroxyl of hydroxyl dipyridyl derivatives and/or the cation formation complex ion of nitrogen base and Pd, Pb.
The hydroxyl dipyridyl derivatives of the present invention, preferably hydroxyl 2,2, it is-dipyridyl derivatives, hydroxyl
3,3 ,-dipyridyl derivatives, preferably hydroxyl 2,2 ,-dipyridyl derivatives, because it is combined rear extra hydroxyl with aluminium oxide
With Pd, Pb preferable complex reaction can occur for base and two nitrogen bases at ortho position.
The present invention is a kind of method that ethylene selects hydrofinishing, and it is mainly ethylene to be formed in entrance raw material, and reactor enters
Mouth material composition：Ethylene >=99.99% (Φ), acetylene 1~10ppm of 5~100ppm, CO, hydrogen is by the way of distribution, H2/
C2H2Generally 2~20.1.5~2.5MPa of reaction pressure, 2000~10000h of gas volume air speed-1, 25 DEG C of inlet temperature~
40℃。
The catalyst type used is defined in the present invention, such catalyst choice has larger area with traditional catalyst
Not.
The principle of the present invention is：In selective hydrogenation reaction, closed as used catalyst activity component Pd, Pb is formed
The quantity of gold, the hydrogen that caltalyst phase is adsorbed is greatly reduced, and the trend that deep hydrogenation occurs for acetylene substantially reduces, catalyst
Selectivity significantly improves.
The acquisition of the catalyst preferably includes following steps：With the organic solution of hydroxyl dipyridyl derivatives, dipping
Al2O3It is carrier, obtains hydroxyl-bipyridyl/Al after drying2O3Precursor prepares the mixed-cation solution dipping of Pd, Pb
Hydroxyl-bipyridyl/Al2O3Precursor, it is dry at 60 DEG C~150 DEG C, obtain PdPb- hydroxyls-bipyridyl/Al2O3Precursor.
In 300~600 DEG C of 2~12h of roasting temperature, required catalyst is obtained.
Al of the present invention2O3Be carrier it is preferably aluminium oxide, or mainly contains Al2O3, wherein also doped with other oxides
Mixture, other oxides are silica, titanium oxide, magnesia and/or calcium oxide.The aluminium oxide is γ, δ, θ, alpha-crystal form
Or in which several mixing crystal forms, preferably θ, α or its mix crystal form.
Carrier can be spherical in the present invention, cylindrical, circular ring shape, bar shaped, cloverleaf pattern, bunge bedstraw herb shape etc..
Following procedure may be used to implement in catalyst preparation of the present invention, which can be divided into the progress of 3 steps.
A. hydroxyl-bipyridyl/Al2O3The preparation of precursor
The organic solution of hydroxyl dipyridyl derivatives is mixed with carrier, solution is made to be absorbed, at 20 DEG C~60 DEG C
At a temperature of reaction 2~for 24 hours, take out solid particle, it is dry at 60 DEG C~150 DEG C, obtain hydroxyl-bipyridyl/Al2O3Precursor；
The molal quantity of hydroxyl-bipyridyl/(Pd+Pb) is preferably 20~120；The volume of organic solution is preferably equal to or greater than carrier total volume
80%.
B.PdPb- hydroxyls-bipyridyl/Al2O3The preparation of precursor
Prepare Pd, Pb mixed-cation solution, at a temperature of 30 DEG C~100 DEG C with hydroxyl-bipyridyl obtained by step A/
Al2O3Precursor reaction 2~for 24 hours, takes out solid particle, dry at 60 DEG C~150 DEG C, obtain PdPb- hydroxyls-bipyridyl/
Al2O3Precursor.
The ratio between the molal quantity of Pb and the molal quantity of Pd are preferably 0.4~11, and it is 1.0~4.0 preferably to adjust pH value；Pd、Pb
The volume of mixed-cation solution be preferably hydroxyl-bipyridyl/Al2O3The 60%~200% of precursor total volume,.
C. the preparation of catalyst
PdPb- hydroxyls-bipyridyl/Al prepared by step B2O3Precursor in 300~600 DEG C of 2~12h of roasting temperature,
Make PdPb- hydroxyls-bipyridyl/Al2O3Precursor is changed into corresponding metal composite oxide, obtains catalyst.
In catalyst in use, can H be used catalyst made from above method in the reactor2Reduction treatment is carried out,
Obtain reduction-state catalyst.
In step, the hydroxyl dipyridyl derivatives, preferably hydroxyl 2,2 ,-dipyridyl derivatives,
Hydroxyl 3,3 ,-dipyridyl derivatives, preferably hydroxyl 2,2 ,-dipyridyl derivatives.It may insure Al2O3It is produced
While raw extensive chemical absorption, the extra hydroxyl two nitrogen bases adjacent with bipyridyl are combined with active component Pd, Pb.With
The molal quantity of molal quantity meter, hydroxyl-bipyridyl/(Pd+Pb) is 20~120.
Solvent is added in step in order to make hydroxyl dipyridyl derivatives be completely dissolved, is existed with being conducive to macromolecule
Absorption on carrier, solvent can be ethyl alcohol and ether.How much is the addition of solvent, and mainly to control institute's solubilizer can make height
Molecule is completely dissolved.
In stepb, the solution of palladium-lead can be the soluble salt solutions of palladium, lead, such as can be Pd (NO3)2、Pb
(NO3)2Mixed solution.Palladium, lead salt dosage are can make Pd, Pb content of final catalyst in the mixed solution.
In step C, what roasting preferably carried out in having oxygen atmosphere, calcination temperature of the present invention is preferably 350 DEG C~500
℃。
In catalyst in use, can H be used catalyst made from above method in the reactor2Reduction treatment is carried out,
Obtain reduction-state catalyst.
The present inventors have additionally discovered that when carrying out selective hydrogenation reaction using this method, activity, the selectivity of catalyst reaction
It is significantly improved, catalyst stability enhancing.
Description of the drawings
Fig. 1 is a kind of device ethylene rectification flow figure using back end hydrogenation technological process using the present invention.
Fig. 2 is a kind of device ethylene rectification flow figure using front-end deethanization technological process using the present invention.
Fig. 3 is a kind of device ethylene rectification flow figure using predepropanization technological process using the present invention.
In figure：
1-oil scrubber；2-water scrubbers；3-caustic wash towers；4-driers；5-domethanizing columns；6-dethanizers；7-carbon
Two hydrogenation reactors；8, ethylene rectifying column；9, ethylene finishing reactor；10-compressors；11-front-end deethanization towers；12, preceding de-
Propane tower.
Specific implementation mode
Embodiment 1
Weigh Φ 4.2mm, specific surface area 21.0m2/ g, hole hold 0.35mL/g, the spherical α-of heap density 0.88g/ml
Al2O3Carrier 500g.
By 265.18g 4,4- dihydroxy -2,2- bipyridyls are dissolved in 700mL ethanol solutions, by above-mentioned carrier impregnation above-mentioned
In solution, after after standing 2h dihydroxy -2,2- bipyridyl being loaded on alumina support completely, 80 DEG C of dry 6h are obtained
Hydroxyl-bipyridyl/Al2O3Precursor.
Weigh 0.49g Pd (NO3)2、2.94g Pb(NO3)2600mL deionized waters are dissolved in, 10mL concentrated nitric acids are slowly added to
To being completely dissolved, it is 2.1 to adjust pH value, is configured to mixed solution.By above-mentioned hydroxyl-bipyridyl/Al2O3Precursor, which is added to, has matched
The solution of system stirs 10min, stands 2.5h, pours out raffinate, obtain Pd Pb- hydroxyls-bipyridyl/Al2O3Precursor (hydroxyl-connection
Pyridine molal quantity：(Pd+Pb)=80).2h is roasted in air atmosphere at a temperature of 550 DEG C after 120 DEG C of dry 4h, obtains (Pd-
Pb)/Al2O3Catalyst.It is positioned in fixed-bed reactor before use, is 99.9% with hydrogen purity, air speed 200h-1's
Gas obtains load type palladium-lead catalyst S-1 at a temperature of 120 DEG C.It is that 0.040%, Pb contains to measure catalyst Pd contents
Amount is 0.63%.
Comparative example 1
Weigh Φ 4.2mm, specific surface area 21.0m2/ g, hole hold 0.35mL/g, the spherical α-of heap density 0.88g/ml
Al2O3Carrier 500g.
A, functionalized poly vinyl chloride (PVC)/Al2O3Preparation
PVC 8.9g are dissolved completely in 800mlTHF (tetrahydrofuran), by above-mentioned carrier impregnation to above-mentioned solution,
PVC is set to be adsorbed in Al after standing 2h2O3Surface, drying for standby.Obtain PVC/Al2O3。
119.28g dicyandiamides and 4.0gNa is added2CO3, above-mentioned PVC/Al is added2O3Flow back 1h, is cooled to room temperature, spends
Ion water washing to neutrality, drying for standby obtains functionalization PVC/Al2O3。
B、Pd-Pb-polymer/Al2O3The preparation of presoma
Weigh 0.49g Pd (NO3)2、2.94g Pb(NO3)22400mL deionized waters are dissolved in, 10mL concentrated nitric acids are slowly added to
To being completely dissolved, it is 2.1 to adjust pH value, is made into mixed solution, takes the functionalization-PVC/Al prepared2O3Presoma is added into
To Pd (NO3)2、Pb(NO3)2Mixed solution in, stir 30min, pour out raffinate, by above-mentioned product be washed with deionized to
Neutrality obtains (Pd-Pb)-PVC/Al at 120 DEG C after dry 4h2O3Presoma.
C, the preparation of catalyst
By the presoma of above-mentioned preparation, 550 DEG C of roasting 2h, obtain oxidation state (Pd-Pb)/Al in air atmosphere2O3Catalysis
Agent.It is positioned in fixed-bed reactor before use, is 99.9% with hydrogen purity, air speed 200h-1Gas, at 120 DEG C
At a temperature of, obtain load type palladium-lead catalyst D-1.It is 0.63% that measure catalyst Pd contents, which be 0.040%, Pb contents,.
The method for selecting hydrofinishing using ethylene, process flow chart is as shown in Fig. 1, raw material composition and working condition
It is shown in Table 1.
1 micro anti-evaluation parameter of table
2 catalyst 200h performance average values of table
| Catalyst | Inlet temperature DEG C | Temperature liter DEG C | C2H2Residual volume (μ L/L) | Hydrogenation selectivity, % | Green oil amount (g) |
| S-1 | 33 | 6 | 0 | 76 | 0.9 |
| D-1 | 35 | 8 | 1.4 | 34 | 2.0 |
Embodiment 2
Weigh Φ 3.5mm, high 3.5mm, specific surface area 58.0m2/ g, Kong Rongwei 0.66ml/g, heap density are 0.67g/
Cylindrical δ-the Al of ml2O3Carrier 500g.
By 39.4g 4,4- dihydroxy -2,2- bipyridyls are dissolved in 650mL ethanol solutions, by above-mentioned carrier impregnation above-mentioned molten
In liquid, after after standing 8h dihydroxy -2,2- bipyridyl being loaded on alumina support completely, 90 DEG C of dry 8h obtain hydroxyl
Base-bipyridyl/Al2O3Precursor.
Weigh 0.73gPd (NO3)2、1.47g Pb(NO3)2600mL deionized waters are dissolved in, are slowly added to 1mL concentrated nitric acids extremely
It is completely dissolved, it is 2.5 to adjust pH value, mixed solution is made into, by above-mentioned hydroxyl-bipyridyl/Al2O3Precursor, which is added to, have been prepared
Solution stirs 60min, stands 8h, pours out raffinate, obtain Pd Pb- hydroxyls-bipyridyl/Al2O3(hydroxyl-bipyridyl rubs precursor
That number：(Pd+Pb)=20).
By the presoma of above-mentioned preparation, 500 DEG C of roasting 4h in air atmosphere.Fixed-bed reactor is positioned over before use
In, it is 99.9% with hydrogen purity, air speed 200h-1Gas obtain load type palladium-lead catalyst S- at a temperature of 120 DEG C
2.It is 0.32% that measure catalyst Pd contents, which be 0.055%, Pb contents,.
Comparative example 2
Weigh Φ 3.5mm, high 3.5mm, specific surface area 58.0m2/ g, Kong Rongwei 0.66ml/g, heap density are 0.67g/
Cylindrical δ-the Al of ml2O3Carrier 500g.
Weigh 0.49gPd (NO3)2、0.43g Pb(NO3)2500mL deionized waters are dissolved in, concentrated nitric acid is slowly added to, are stirred
It is completely dissolved to solid, it is 2.5 to adjust pH value, is configured to mixed solution, stirs 60min, on even application to load weighted carrier,
Still aging 5h, 100 DEG C of dry 4h.500 DEG C of roasting 4h in air atmosphere.It is positioned in fixed-bed reactor before use,
It is 99.9% with hydrogen purity, air speed 300h-1Gas, restore 4h at a temperature of 100 DEG C, obtain the catalysis of load type palladium-lead
Agent D-2.It is 0.32% that measure catalyst Pd contents, which be 0.055%, Pb contents,.
The method for selecting hydrofinishing using ethylene, process flow chart is as shown in Fig. 2, raw material composition and working condition
It is shown in Table 3.
3 micro anti-evaluation parameter of table
4 catalyst 200h performance average values of table
| Catalyst | Inlet temperature DEG C | Temperature liter DEG C | C2H2Residual volume (μ L/L) | Hydrogenation selectivity, % | Green oil amount (g) |
| S-2 | 32 | 8 | 0 | 64 | 1.0 |
| D-2 | 32 | 14 | 1.0 | 10 | 5.4 |
Embodiment 3
Weigh Φ 4.3mm, specific surface area 47.0m2/ g, Kong Rongwei 0.19mL/g, heap are more spherical than the tooth for 0.79g/ml
Carrier 500g, wherein θ-Al2O3460g, titanium oxide 40g.
By 64.5g 6,6'- dihydroxy -3,3'- bipyridyls are dissolved in 700mL ethanol solutions, by above-mentioned carrier impregnation above-mentioned
In solution, after after standing 10h 6,6'- dihydroxy -3,3'- bipyridyls being loaded on alumina support completely, 120 DEG C of dryings
4h obtains hydroxyl-bipyridyl/Al2O3Precursor.
Weigh 0.17gPd (NO3)2,0.74g Pb(NO3)2600mL deionized waters are dissolved in, are slowly added to 1mL concentrated nitric acids extremely
It is completely dissolved, it is 3.2 to adjust pH value, mixed solution is made into, by above-mentioned hydroxyl-bipyridyl/Al2O3Precursor, which is added to, have been prepared
Solution stirs 60min, stands 8h, pours out raffinate, remaining solid dry 8h at 100 DEG C, obtain PdPb- hydroxyls-bipyridyl/
Al2O3Precursor (hydroxyl-bipyridyl molal quantity：(Pd+Pb)=60).
By the presoma of above-mentioned preparation, 450 DEG C of roasting 6h in air atmosphere.Fixed-bed reactor is positioned over before use
In, it is 99.9% with hydrogen purity, air speed 200h-1Gas obtain load type palladium-lead catalyst S- at a temperature of 120 DEG C
3.It is 0.16% that measure catalyst Pd contents, which be 0.04%, Pb contents,.
Comparative example 3
Weigh Φ 4.2mm, specific surface area 45.0m2/ g, Kong Rongwei 0.17ml/g, heap are more spherical than the tooth for 0.77g/ml
Carrier 500g, wherein θ-Al2O3460g, titanium oxide 40g.
A, the preparation of functionalization haloflex (CPE)
CPE 16.0g are dissolved completely in 800mlTHF, 480g dicyandiamides and 4.0gNa is added2CO3, CPE reflux is added
It 2 hours, is cooled to room temperature, is washed with deionized to neutrality, it is spare to obtain functionalization CPE.
B, (Pd-Pb)-high-molecular complex/Al2O3The preparation of presoma
Weigh 0.17gPd (NO3)2,0.74g Pb(NO3)2, 1ml nitric acid is measured, above-mentioned functionalization CPE solution is added to
In, 60min is stirred, (Pd-Pb)-CPE is obtained.
By 500g carriers be added mixed solution in, stand 4h after being sufficiently stirred, by above-mentioned product be washed with deionized to
Neutrality, remaining solid dry 8h at 100 DEG C, obtains (Pd-Pb)-high-molecular complex/Al2O3Presoma.
C, the preparation of catalyst
By the presoma of above-mentioned preparation, 450 DEG C of roasting 8h, obtain oxidation state (Pd-Pb)/Al in air atmosphere2O3Catalysis
Agent.It is positioned in fixed-bed reactor before use, is 99.9% with hydrogen purity, air speed 200h-1Gas, at 120 DEG C
At a temperature of, obtain load type palladium-lead catalyst D-3.It is 0.16% that measure catalyst Pd contents, which be 0.04%, Pb contents,.
The method for selecting hydrofinishing using ethylene, process flow chart is as shown in Fig. 3, raw material composition and working condition
It is shown in Table 5.
5 micro anti-evaluation parameter of table
6 catalyst 200h performance average values of table
| Catalyst | Inlet temperature DEG C | Temperature liter DEG C | C2H2Residual volume (μ L/L) | Hydrogenation selectivity, % | Green oil amount (g) |
| S-3 | 35 | 17 | 0 | 64 | 0.9 |
| D-3 | 35 | 20 | 1.5 | 32 | 2.2 |
Embodiment 4
Weigh Φ 3.0mm, high 3.0mm, specific surface area 53.0m2/ g, Kong Rongwei 0.56ml/g, heap density are 0.75g/
Cylindrical δ-the Al of ml2O3Carrier 500g.
By 48.4g 4,4- dihydroxy -2,2- bipyridyls are dissolved in 650mL ethanol solutions, by above-mentioned carrier impregnation above-mentioned molten
In liquid, after after standing 10h dihydroxy -2,2- bipyridyl being loaded on alumina support completely, 100 DEG C of dry 6h are obtained
Hydroxyl-bipyridyl/Al2O3Precursor.
Weigh 0.61gPd (NO3)2、4.41g Pb(NO3)2600mL deionized waters are dissolved in, are slowly added to 2mL concentrated nitric acids extremely
It is completely dissolved, it is 3.5 to adjust pH value, mixed solution is made into, by above-mentioned hydroxyl-bipyridyl/Al2O3Precursor, which is added to, have been prepared
Solution stirs 60min, stands 10h, pours out raffinate, and dry 10h obtains PdPb- hydroxyls-bipyridyl/Al at 90 DEG C2O3Precursor
(hydroxyl-bipyridyl molal quantity：(Pd+Pb)=100).
By the presoma of above-mentioned preparation, 600 DEG C of roasting 2h in air atmosphere.Fixed-bed reactor is positioned over before use
In, it is 99.9% with hydrogen purity, air speed 200h-1Gas obtain load type palladium-lead catalyst S- at a temperature of 120 DEG C
4.It is 0.97% that measure catalyst Pd contents, which be 0.050%, Pb contents,.
Comparative example 4
Weigh Φ 3.0mm, high 3.0mm, specific surface area 53.0m2/ g, Kong Rongwei 0.56ml/g, heap density are 0.75g/
Cylindrical δ-the Al of ml2O3Carrier 500g.
By 48.4g 4,4- dihydroxy -2,2- bipyridyls are dissolved in 650mL ethanol solutions, by above-mentioned carrier impregnation above-mentioned molten
In liquid, after after standing 10h dihydroxy -2,2- bipyridyl being loaded on alumina support completely, 100 DEG C of dry 6h are obtained
Hydroxyl-bipyridyl/Al2O3Precursor.
Weigh appropriate Pd (NO3)2、AgNO3600mL deionized waters are dissolved in, 2mL concentrated nitric acids is slowly added to being completely dissolved, adjusts
PH value is 3.5, is made into mixed solution, by above-mentioned hydroxyl-bipyridyl/Al2O3Precursor is added to the solution prepared, stirring
60min stands 10h, pours out raffinate, and dry 10h obtains PdAg- hydroxyls-bipyridyl/Al at 90 DEG C2O3Precursor (hydroxyl-connection pyrrole
Pyridine molal quantity：(Pd+Ag)=100).
By the presoma of above-mentioned preparation, 600 DEG C of roasting 2h in air atmosphere.Fixed-bed reactor is positioned over before use
In, it is 99.9% with hydrogen purity, air speed 200h-1Gas obtain load type palladium-silver catalyst D- at a temperature of 120 DEG C
4.It is 0.44% that measure catalyst Pd contents, which be 0.050%, Ag contents,.
The method for selecting hydrofinishing using ethylene, process flow chart is as shown in Fig. 2, raw material composition and working condition
It is shown in Table 7.
7 micro anti-evaluation parameter of table
8 catalyst 200h performance average values of table
| Catalyst | Inlet temperature DEG C | Temperature liter DEG C | C2H2Residual volume (μ L/L) | Hydrogenation selectivity, % | Green oil amount (g) |
| S-4 | 37 | 14 | 0 | 67 | 0.6 |
| D-4 | 37 | 14 | 1.2 | 30 | 6.1 |
As can be seen that compared with the traditional preparation catalyst of use, simultaneously with use organic polymer grafted functional group
Load on a catalyst support, then by the solution of carrier impregnation activity Pd, Pb obtains the side of organic polymer metal complex
Method prepares catalyst and compares, and uses the method for hydrotreating of the present invention, and the activity of hydrogenation reaction and selectivity are significantly better than traditional
Method of hydrotreating, Ethylene purity improves, so as to improve the performance of polymer grade ethylene product very well.The reduction of green oil simultaneously, makes
The activated centre for obtaining catalyst is not covered by by-product, and catalyst activity and selectivity are kept well, catalyst
Service life extends.
Claims (15)
1. a kind of method of ethylene selection hydrofinishing, for adding the adiabatic reactor reactor of hydrogen to be located at after ethylene rectifying column, second
Before alkene polymer reactor；By the smart ethylene feed of ethylene distillation column overhead, after matching hydrogen, selected into adiabatic reactor reactor
It selects and adds hydrogen, it is characterised in that：Pd-Pb series catalysts are housed, carrier is alumina series carrier, with catalyst in adiabatic reactor reactor
Quality be 100% meter, wherein Pd contents 0.025~0.055%, Pb contents are 0.15~1.0%, the specific surface area of catalyst
For 20~60m2/ g, pore volume are 0.15~0.70mL/g；The catalyst passes through carrier and hydroxyl connection in preparation process
Pyridine derivate combines, and hydroxyl dipyridyl derivatives form metal complex with active component；Reaction condition is：Adiabatic reactor
25~40 DEG C, 1.5~2.5MPa of reaction pressure of reactor inlet temperature, 2000~10000h of gas volume air speed-1。
2. the method for ethylene selection hydrofinishing according to claim 1, it is characterised in that catalyst preparation process, at least
Including：Hydroxyl dipyridyl derivatives are loaded on alumina series carrier, then more by hydroxyl dipyridyl derivatives
The cation of remaining hydroxyl and/or nitrogen base and Pd, Pb forms complex ion.
3. the method for ethylene selection hydrofinishing according to claim 2, it is characterised in that hydroxyl bipyridyl derives
Object is hydroxyl 2,2 ,-dipyridyl derivatives or hydroxyl 3,3 ,-dipyridyl derivatives.
4. the method for ethylene selection hydrofinishing according to claim 1, it is characterised in that the acquisition of catalyst includes such as
Lower step：With the organic solution of hydroxyl dipyridyl derivatives, impregnated carrier obtains hydroxyl-bipyridyl/Al after drying2O3
Precursor, the mixed-cation solution for preparing Pd, Pb impregnate hydroxyl-bipyridyl/Al2O3Precursor is done at 60 DEG C~150 DEG C
It is dry, obtain PdPb- hydroxyls-bipyridyl/Al2O3Precursor；In 300~600 DEG C of 2~12h of roasting temperature, required urge is obtained
Agent.
5. the method for ethylene selection hydrofinishing according to claim 1, it is characterised in that carrier is for aluminium oxide or mainly
Contain Al2O3, wherein also doped with other hopcalites, other oxides be silica, titanium oxide, magnesia and/or
Calcium oxide；The aluminium oxide is γ, δ, θ, alpha-crystal form or in which several mixing crystal form Al2O3。
6. the method for ethylene according to claim 5 selection hydrofinishing, it is characterised in that the aluminium oxide be θ, α or
It mixes crystal form Al2O3。
7. the method for ethylene according to claim 1 selection hydrofinishing, it is characterised in that carrier be spherical, cylinder
Shape, circular ring shape, bar shaped, cloverleaf pattern or bunge bedstraw herb shape.
8. selecting hydrofinishing process according to any ethylene in claim 1-7, it is characterised in that the preparation of catalyst
Method includes the following steps：
A. hydroxyl-bipyridyl/Al2O3The preparation of precursor
The organic solution of hydroxyl dipyridyl derivatives is mixed with carrier, at a temperature of 20 DEG C~60 DEG C react 2~for 24 hours,
Solid particle is taken out, it is dry at 60 DEG C~150 DEG C, obtain hydroxyl-bipyridyl/Al2O3Precursor；
B.PdPb- hydroxyls-bipyridyl/Al2O3The preparation of precursor
Prepare Pd, Pb mixed-cation solution, at a temperature of 30 DEG C~100 DEG C with hydroxyl-bipyridyl/Al obtained by step A2O3
Precursor reaction 2~for 24 hours, solid particle is taken out, it is dry at 60 DEG C~150 DEG C, obtain PdPb- hydroxyls-bipyridyl/Al2O3Before
Body；
C. the preparation of catalyst
PdPb- hydroxyls-bipyridyl/Al prepared by step B2O3Precursor is in 300~600 DEG C of 2~12h of roasting temperature so that
PdPb- hydroxyls-bipyridyl/Al2O3Precursor is changed into corresponding metal composite oxide, obtains catalyst.
9. the method for ethylene according to claim 8 selection hydrofinishing, it is characterised in that hydroxyl-bipyridyl in step A/
(Pd+Pb) molal quantity is 20~120：1.
10. the method for ethylene selection hydrofinishing according to claim 8, it is characterised in that in stepb, Pd, Pb's
Mixed-cation solution is the mixed solution of palladium nitrate and plumbi nitras.
11. the method for ethylene selection hydrofinishing according to claim 8, it is characterised in that in stepb, mole of Pb
The ratio between number and the molal quantity of Pd are 0.4~11：1.
12. the method for ethylene selection hydrofinishing according to claim 8, it is characterised in that in stepb, adjusting Pd,
The mixed-cation solution ph of Pb is 1.0~4.0.
13. the method for ethylene according to claim 1 selection hydrofinishing, it is characterised in that hydrogen is with acetylene volume ratio
2~20：1.
14. the method for ethylene selection hydrofinishing according to claim 1, it is characterised in that adiabatic reactor reactor reaction bed
The number of plies is single.
15. the method for ethylene selection hydrofinishing according to claim 1, it is characterised in that can contain in hydrogenating materials gas
C-4-fraction not higher than 100ppm.
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| CN101081366A (en) * | 2007-02-02 | 2007-12-05 | 中国石油天然气股份有限公司长庆石化分公司 | Pd radicel duplex metal selective hydrogenation catalyzer and method for preparing the same and application thereof |
| CN102206130A (en) * | 2011-04-07 | 2011-10-05 | 中国石油天然气股份有限公司 | Selective hydrogenation method of C2 fraction |
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| CN101081366A (en) * | 2007-02-02 | 2007-12-05 | 中国石油天然气股份有限公司长庆石化分公司 | Pd radicel duplex metal selective hydrogenation catalyzer and method for preparing the same and application thereof |
| CN102206130A (en) * | 2011-04-07 | 2011-10-05 | 中国石油天然气股份有限公司 | Selective hydrogenation method of C2 fraction |
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