CN107382685A - A kind of pipeline mixes oxygen formula formaldehyde preparation method - Google Patents
A kind of pipeline mixes oxygen formula formaldehyde preparation method Download PDFInfo
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- CN107382685A CN107382685A CN201710564103.4A CN201710564103A CN107382685A CN 107382685 A CN107382685 A CN 107382685A CN 201710564103 A CN201710564103 A CN 201710564103A CN 107382685 A CN107382685 A CN 107382685A
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C45/00—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds
- C07C45/27—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by oxidation
- C07C45/32—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by oxidation with molecular oxygen
- C07C45/37—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by oxidation with molecular oxygen of >C—O—functional groups to >C=O groups
- C07C45/38—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by oxidation with molecular oxygen of >C—O—functional groups to >C=O groups being a primary hydroxyl group
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C45/00—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds
- C07C45/78—Separation; Purification; Stabilisation; Use of additives
- C07C45/783—Separation; Purification; Stabilisation; Use of additives by gas-liquid treatment, e.g. by gas-liquid absorption
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Abstract
The invention discloses a kind of pipeline to mix oxygen formula formaldehyde preparation method, belongs to Formaldehyde Production field.The formaldehyde preparation method of the present invention, including S1：Methanol, tail gas, vapor are mixed in a mixer, the air of air heater discharge is mixed with the gas that blender exports in pipeline, and fire-retardant filtering is carried out subsequently into filter；S2：After material mixed gas enter oxidator, oxidation, the dehydrogenation reaction of methanol are carried out in the presence of catalyst for electrolytic silver, into formaldehyde and part accessory substance；S3：Formaldehyde gaseous mixture is absorbed by process water, carries out aldehyde, alcohol separation, and the formaldehyde after separation is discharged as finished product folding and unfolding, residual formaldehyde gas by the tower top on 1# absorption towers, continues resorption into 2# absorption towers, residual gas is handled as tail gas.The present invention is mainly mixed air with methanol gaseous mixture in transfer pipeline, is mutually mixed evenly, and reaction is more abundant, and impurity and soda acid content are low, avoid existing risk of explosion.
Description
Technical field
The present invention relates to Formaldehyde Production technical field, and oxygen formula formaldehyde preparation method is mixed more specifically to a kind of pipeline.
Background technology
At present, China silver method prepares formaldehyde tool and has been subjected to half a century, achieves huge achievement, formaldehyde in every respect
Production is developed into the production that becomes more meticulous by extensive style, by professional development, larger warp simply has been put into technique and operation
Always study and how to improve conversion.
Domestic Formaldehyde Production mainly uses two kinds of process routes, and traditional handicraft and circulation of tail gas method technique, traditional handicraft are adopted
Formaldehyde is produced with ternary blender oxidation reaction, circulation of tail gas method technique is to produce formaldehyde using quaternary gas oxidation reaction, instead
Answer absorption mechanism essentially identical, simply the configuration of reaction member apparatus is different.Circulation of tail gas method technique increases exhaust system, uses
Tail gas removes reaction heat instead of part dispensing vapor, can accomplish 50% or so concentration Formaldehyde Production.
Above two preparation method is all that methanol and air are transported into oxidator after wherein mixing is mixed, due to mixing
Body product is larger, and obstructed gas enters orientation difference, can only be mixed in the process of circulation, then be easy to local air amount occur
The problem of higher and some other part methanol contents are higher, mixing is not abundant enough, uneven.In this case, subsequently
Reaction may also be difficult to fully carry out, and cause that prepared formaldehyde impurity contained in composite gas content is higher, and conversion ratio is relatively low；In addition,
If methanol meets certain proportion with air content, it is easy to explosive event occur.
Chinese patent (CN105294414A) discloses a kind of Formaldehyde Production system, and it is included in methanol feedstock tank, methanol
Between tank, methanol filter, methanol reboiler, methanol evaporator, quaternary blender, methanol evaporator, air heater, steam mistake
Filter, heater exhaust gas, filter, oxidator, the first absorption tower, second absorption tower, exhaust gas treating device, heater exhaust gas, first
Aldehyde pans；System completes following process：Evaporate, gas process processed, the quaternary mixed gas for meeting procedure technology requirement is made；Oxygen
Chemical industry sequence：Oxidation, the dehydrogenation reaction of methanol are carried out in the presence of catalyst for electrolytic silver, formaldehyde is converted into by methanol and is produced few
The accessory substance of amount；Absorb process：Using water and formalin as absorbent in packed absorber, absorbed through continuous flow upstream and work is made
Industry formalin.
Above-mentioned reaction is used circulation of tail gas method preparation system, but its conversion of quaternary blender to W-response
Rate reaches certain bottleneck, and by exploring, its reason is likely to the uneven influence to W-response of internal mix, therefore,
How the uniformity of gas mixing is preferably improved, and the raising to reaction transformation efficiency is significant.
The content of the invention
1. invention technical problems to be solved
It is an object of the invention to overcome the shortcomings of that methanol is difficult to be well mixed in a mixer with air in the prior art,
Provide a kind of pipeline and mix oxygen formula formaldehyde preparation method, the present invention mainly enters air and methanol gaseous mixture in transfer pipeline
Row mixing, is mutually mixed evenly, and reaction is more abundant, and impurity and soda acid content are low, avoid existing risk of explosion.
2. technical scheme
To reach above-mentioned purpose, technical scheme provided by the invention is：
A kind of pipeline of the present invention mixes oxygen formula formaldehyde preparation method, uses the drainage conduit and filter of the blender of system
It is connected, and mixed material is delivered to oxidator, the blast pipe of air heater is connected with the drainage conduit of the blender；Its
Preparation process is：
S1：Prepare methanol, tail gas, vapor, the conveying of air and the preparation of gaseous mixture, methanol, tail gas, vapor are existed
Mixed in blender, the air of air heater discharge mixes with the gas that blender exports in pipeline, subsequently into filtering
Device carries out fire-retardant filtering；
S2：After material mixed gas enter oxidator, oxidation, the dehydrogenation that methanol is carried out in the presence of catalyst for electrolytic silver are anti-
Should, reaction temperature is controlled at 590~630 DEG C, generates formaldehyde and part accessory substance；
S3：Formaldehyde gaseous mixture is absorbed by process water, carries out aldehyde, alcohol separation, and the formaldehyde after separation is received as finished product
Put, residual formaldehyde gas is discharged by the tower top on 1# absorption towers, continues resorption into 2# absorption towers, residual gas enters as tail gas
Row processing.
As further improvement of the present invention, angle is between the drainage conduit of the blender and the blast pipe of oxidator
70~82 °, and junction is not less than 1m apart from filter port.
As further improvement of the present invention, the oxidized tail gas of the oxidator is delivered to 1# absorption towers, 2# suctions successively
Tower is received, the tail gas part that the 2# absorption towers are discharged is delivered to blender after being heated, and another part is filtered by liquid seal trough
Exhaust gas treating device is delivered to after absorbing.
As further improvement of the present invention, the liquid seal trough includes tank body and the explosion stack at the top of tank body, should
It is connected with control valve on explosion stack, the connection position of explosion stack and tank body is provided with pressure sensor, when pressure sensor detects
When pressure exceedes the limiting value of setting in tank body, control valve automatically opens up, and is exhausted by explosion stack.
As further improvement of the present invention, buffer is additionally provided with the top of the tank body, the import on the buffer
Pipeline is connected with absorption tower, and tail gas flow velocity is reduced by buffer.
As further improvement of the present invention, the buffer is mainly made up of annular chamber and buffering connecting leg, the ring
Shape chamber upper end is connected with inlet pipeline, and the buffering connecting leg of annular chamber lower end is passed through tank base；Ring lumen diameter is more than inlet tube
Road, the diameter for buffering connecting leg.
As further improvement of the present invention, screen cloth is provided with the annular chamber, its entrance positioned at buffering connecting leg
Place.
As further improvement of the present invention, screen cloth is provided with the annular chamber, it is located in the middle part of annular chamber, is sieving
Online side is provided with buffering filler.
As further improvement of the present invention, the buffering filler is steel wool.
As further improvement of the present invention, the tail gas of 2# absorption towers discharge enters annular chamber by inlet pipeline,
To gas filtering buffering, mixed gas is entered in tank body by buffering connecting leg connect with absorbing liquid again for steel wool in annular chamber
Touch, be finally discharged into exhaust gas treating device bottom by outlet conduit.
3. beneficial effect
Using technical scheme provided by the invention, compared with prior art, have the advantages that：
(1) a kind of pipeline of the invention mixes oxygen formula formaldehyde preparation method, and methanol and air are mixed on transfer pipeline
Close, there is bigger disturbance in the duct using both gas shocks, mixing is more uniform, is advantageous to improve the conversion of reaction
Rate, and the risk of explosion because of caused by air skewness is avoided, securely and reliably.
(2) a kind of pipeline of the invention mixes oxygen formula formaldehyde preparation method, controls the drainage conduit of blender and the row of oxidator
Angular range between tracheae, in the angular range, there is larger shock vibration between each other, both can preferably mix；This
Outside, also limit the distance of its interface distance filter port, ensure that gas has enough incorporation times, it is ensured that mixing it is uniform
Property.
(3) a kind of pipeline of the invention mixes oxygen formula formaldehyde preparation method, is provided between absorption tower and exhaust gas treating device
Liquid seal trough, and explosion stack is provided with above liquid seal trough, when the flame in exhaust gas treating device is back to liquid seal trough, can pass through
The outside discharge gas of explosion stack, pressure in liquid seal trough is reduced, avoids existing risk of explosion.
(4) a kind of pipeline of the invention mixes oxygen formula formaldehyde preparation method, buffer is connected with inlet pipeline, the buffering
Device can slow down air-flow velocity, and the bubble formed after outflow is relatively small, by increasing capacitance it is possible to increase the contact area with liquid, so that
Internal gas is further absorbed, and reduces the imflammable gas amount of discharge, realizes the further absorption cleaning to discharging tail gas.
Brief description of the drawings
Fig. 1 is the schematic diagram of the bypass oxygenation type formaldehyde preparation system of the present invention；
Fig. 2 is the structural representation of the exhaust gas processing device of the present invention；
Fig. 3 is the composition mechanism schematic diagram of liquid seal trough in the present invention；
Fig. 4 is the structural representation of buffer in the present invention；
Fig. 5 is the structural representation of U-shaped control position pipe in the present invention.
Label declaration in schematic diagram：
001st, methanol reboiler；002nd, methanol evaporator；003rd, blender；004th, filter；005th, oxidator；006、1#
Absorption tower；007th, 2# absorption towers；008th, formaldehyde finished pot；009th, vapor filter；
011st, air heater；012nd, drum；013rd, liquid seal trough；014th, exhaust gas treating device；015th, steam distributor；016、
Heater exhaust gas；
11st, tank body；12nd, buffer；121st, annular chamber；122nd, steel wool；123rd, screen cloth；124th, connecting leg is buffered；13rd, import
Pipeline；14th, explosion stack；15th, control valve；16th, outlet conduit；17th, liquid level gauge；18th, outflow valve.
Embodiment
To further appreciate that present disclosure, the present invention is described in detail in conjunction with the accompanying drawings and embodiments.
Embodiment 1
As shown in figure 1, system include methanol reboiler 001, methanol evaporator 002, methanol feedstock tank, methanol pans and
Methanol filter is mainly to provide methanol feedstock not shown in figure, and methanol reboiler 001, methanol evaporator 002 connect successively
Connect, methanol feedstock tank provides methanol for methanol pans, and then methanol is filtered by methanol filter, the first after filtering
The bottom that alcohol is passed through methanol reboiler 001 is heated, methanol heating and gasifying in methanol reboiler 001, the first of gasification
Alcohol is passed through methanol evaporator 002；
Methanol evaporator 002, vapor filter 009, heater exhaust gas 016 are connected with blender 003 respectively, and are mixing
Device 003 provides methanol steam, steam and tail gas successively, and the methanol steam, steam and tail gas are formed in blender 003
Mixed gas；
The one end of filter 004 is connected with blender 003, and the other end of filter 004 is connected with oxidator 005, blender 003
Drainage conduit on be connected with the blast pipe of air heater 011.Blender 003 is by mixed gas with the air after heating in pipeline
Filter 004 is passed through after middle mixing, filter 004 will be passed through oxidator 005 after the filtering of quaternary mixed gas, and the quaternary is mixed
Close gas and contact simultaneously heating response with catalyst in oxidator 005.
Oxidator 005 is connected with 1# absorption towers 006, and 1# absorption towers 006,2# absorption towers 007, exhaust gas treating device 014 are successively
Connection, 1# absorption towers 006 are connected with formaldehyde pans.Caused formaldehyde gas passes sequentially through 1# absorption towers in oxidator 005
006th, 2# absorption towers 007 absorb, and caused tail gas is divided into two-way and is passed through exhaust gas treating device 014 and heater exhaust gas 016, at tail gas
Manage device 014 and exhaust combustion heating water is produced into steam, heater exhaust gas 016 will be passed through blender 003 after tail gas heating, 2# absorbs
Tower 007 is that 1# absorption towers 006 provide dilute formaldehyde by pump, and the formalin for meeting concentration of formaldehyde is pumped into first by 1# absorption towers 006
Aldehyde pans or formaldehyde finished pot 008, formaldehyde finished pot 008 are used to largely store finished product formaldehyde.
As shown in figure 1, methanol reboiler 001, air heater 011, vapor filter 009, heater exhaust gas 016 are distinguished
Heated by steam, the steam is generated by drum 012；Oxidator 005 has a quench zone, by cooling down soft water pair
The quench zone is cooled down, and caused hot water is passed through drum 012, and drum 012 is that exhaust gas treating device 014 provides hot water, tail gas
Steam caused by the hot water that processor 014 is passed through by combustion tail gas heating is passed through drum 012.
Drum 012 is distributed steam to methanol reboiler 001, air heater 011, steam by steam distributor 015
Filter 009, heater exhaust gas 016.
The quaternary mixed gas first passes through spark arrester subsequently into oxidator 005 after purification, at 650 DEG C or so
At a temperature of and silver catalyst contact.Methanol evaporator 002 is passed through blender after the mesh mist eliminator separation drop at the top of it
003。
The key point of the present embodiment is that the drainage conduit of blender 003 is connected with filter 004, and mixed material is conveyed
To oxidator 005, the blast pipe of air heater 011 is connected with the drainage conduit of blender 003.From the description above, utilize
The system carry out formaldehyde preparation process be：
S1：Evaporate, gas process processed；
The process includes methanol, tail gas, vapor, the conveying of air and the preparation of gaseous mixture, and methanol, tail gas and water are steamed
Gas mixes in blender 003, and the air that air heater 011 is discharged mixes with the gas that blender 003 exports in pipeline,
Filtered subsequently into filter 004.
The conveying of methanol is for continuous, stable supply methanol evaporator methanol, as reaction raw materials；Vapor both may be used
So that as heat carrier, and can enough reduces the mixing accounting of methanol.
The conveying of air：The purpose of air conveying is to continuously and stably provide required oxygen to methanol oxidation
Gas, while using components such as the nitrogen in air, remove unnecessary reaction heat；Air is obtained by air blower from air.
Tail gas conveys：The purpose of tail gas conveying has three.First, play heat carrier instead of vapor；Second, add
Partial tail gas reduces the aerial explosive range of methanol, is advantageous to keep the safety in production；3rd because the composition of tail gas is unique, can
Concentrated formaldehyde is produced, suppresses dehydrogenation reaction, reduces oxygen temperature, reduces negative reaction so as to reduce unit consumption.
Methanol is conveyed from methanol pans with methanol pump, and reboiler is entered after governor valve control flow；With evaporator
Connected reboiler makes methanol gasifying after being heated by steam, methanol gas leaves evaporator and enters blender；Air is by air blast
Machine is mixed after being sent into heater heating with methanol gas in pipeline, and oxidator is delivered to after filter.
S2：Oxidation operation；
After material mixed gas enter oxidator, oxidation, the dehydrogenation reaction of methanol are carried out in the presence of catalyst for electrolytic silver,
Reaction temperature is controlled at 590~630 DEG C, generates formaldehyde and part accessory substance.
S3：Absorb process；
Formaldehyde gaseous mixture is absorbed by process water, carries out aldehyde, alcohol separation, formaldehyde after separation as finished product folding and unfolding,
Residual formaldehyde gas is discharged by the tower top on 1# absorption towers 006, continues resorption into 2# absorption towers 007, residual gas is as tail
Gas is handled.
The remaining tower top tail containing the gas such as trace formaldehyde, methanol, CO, CO2, CH4 and N2, H2 after fully absorbing
Gas part, which is sent into exhaust gas treating device, burns, and the gas high-altitude after burning is discharged into air, and liberated heat is used to produce water under high pressure
Steam, partial tail gas heat laggard blender by heater and recycled；Air water separates in drum, absorbs required technique
Soft water is sent into by outer tube and added after spinner flowmeter measures by two-level absorption tower tower top, and by adjusting amount of water control
Finished product concentration；The absorbing liquid on 1# absorption towers and 2# absorption towers is got with circulating pump, is carried out after plate type heat exchanger cools down in tower
Continuous circulated sprinkling absorbs, and 1# absorption towers product section is then sent into formaldehyde medial launder through branch road and finally deposited in formaldehyde finished pot
Storage.
Traditional blender is mostly quaternary blender, methanol gas and air, steam and tail gas is mixed together, so
Reacted afterwards by filter, oxidator, because blender volume is larger, it is different that obstructed gas enters orientation, can only be
Mixed in the process of circulation, then be easy to occur local air amount is higher and the problem of some other part methanol contents are higher, mix
Conjunction is not abundant enough, uneven.In this case, follow-up reaction may also be difficult to fully carry out, and cause prepared formaldehyde
Impurity contained in composite gas content is higher, and conversion ratio is relatively low；In addition, if methanol meets certain proportion with air content, it is easy to
There is explosive event.
And the present embodiment mixes methanol and air on transfer pipeline, using both gas shocks in the duct
There is bigger disturbance, mixing is more uniform, is advantageous to improve the conversion ratio of reaction, and avoids causing because of air skewness
Risk of explosion, securely and reliably.
Embodiment 2
The formaldehyde preparation method of the present embodiment, its difference are：The drainage conduit and oxidator of used blender 003
Angle is 80 ° between 005 blast pipe, and in the angle, air and preliminary gaseous mixture can flow to same direction, and tie
Mixed at conjunction, due to mutual impact, two kinds of gases are mutually mixed and blended, and can be sufficiently mixed.Further, also
Can junction set pipeline expansion chamber, the expansion chamber circulation caliber be slightly larger than mixed gas flow pipe diameter, then when
When air-flow enters mixed gas pipeline, because circulation area diminishes, certain vortex can be formed, so that gas mixing is more
Uniformly.In addition, control junction is not less than 1m apart from the port of filter 004, specific length can arrange feelings according to specific pipeline
Condition is set, and the main purpose of the structure is to ensure that methanol gas and air have enough times of contact, and gas mutually mixes
Conjunction reaches stable state
Embodiment 3
The preparation method of the present embodiment, its difference are：The oxidized tail gas of the oxidator 005 of the present embodiment is defeated successively
1# absorption towers 006,2# absorption towers 007 are delivered to, the tail gas part that 2# absorption towers 007 are discharged is delivered to blender after being heated
003, another part is delivered to exhaust gas treating device 014 after being filtered absorption of by liquid seal trough 013, such as Fig. 2.
With reference to Fig. 3, liquid seal trough 013 includes tank body 11 and the explosion stack 14 positioned at the top of tank body 11, connects on the explosion stack 14
Control valve 15 is connected to, for controlling the break-make of the pipeline of explosion stack 14.The connection position of explosion stack 14 and tank body 11 is provided with pressure
After sensor, i.e. control valve 15 are closed, one section of the lower section of explosion stack 14 connects with the inside of tank body 11, sets and presses in the connected component
Force snesor, for detecting the pressure of tank interior.When pressure sensor detects that pressure is more than the limit of setting in tank body 11
During value, control valve 15 automatically opens up, and is exhausted by explosion stack 14.Also liquid level gauge 17 can be set in the side wall of tank body 11, be used for
The liquid level observed in tank body.Outflow valve 18 can be equipped with simultaneously, for adjusting liquid level.
In course of normal operation, the inlet pipeline 13 being connected with 2# absorption towers 007 extend into the bottom of tank body 11, exports quilt
Liquid-immersed, within the specific limits, then the gas discharged is located at the top in tank body to Liquid level, and defeated by outlet conduit 16
Deliver to exhaust gas treating device bottom to be burnt, described exhaust gas treating device is combustion furnace.
If exhaust gas treating device has certain failure, or to there is failure in other parts cause the gas lighted from outlet
Road 16 is entered in tank body 11, it will and pressure in tank body 11 is increased sharply, and also it is this dangerous due in closed state, very
Difficulty is found, if can not effectively solve, may make fire spreading to other parts, or even that tank body 11 can occur is quick-fried
It is fried.And the present embodiment is due to being provided with pressure sensor, when pressure sensor detects that pressure in tank body 11 exceedes the pole of setting
During limit value, processor can be transmitted signals to, processor promotes control valve 15 to open, then can be arranged by explosion stack 14
Gas, although gas may burn away in the explosion stack mouth of pipe, it will not affect greatly in a short time.Can in this period
Fire extinguishing processing is carried out by effective manner, can be returned to normal production in the short time, avoids the deterioration of accident, and can have
Effect reduces loss.
Embodiment 4
The formaldehyde preparation method of the present embodiment, its difference are：The top of tank body 11 is additionally provided with buffer 12, and this is slow
The inlet pipeline 13 rushed on device 12 is connected with absorption tower 2, and tail gas flow velocity is reduced by buffer 12.
With reference to Fig. 4, buffer 12 is mainly made up of annular chamber 121 and buffering connecting leg 124, the upper end of annular chamber 121 and import
Pipeline 13 is connected, and the lower end of annular chamber 121 connection buffering connecting leg 124, the buffering connecting leg 124 is passed through the bottom of tank body 11.Annular chamber 121
Diameter is more than inlet pipeline 13, buffers the diameter of connecting leg 124, and diameter mentioned here refers to internal diameter, in the equal situation of wall thickness
Under, external diameter can form cylindrical protrusions.
Because the internal diameter of annular chamber 121 is larger, after the air-flow of inlet pipeline 13 is entered in annular chamber 121, flow velocity drop
Low, because the internal diameter for buffering connecting leg 124 is less than the internal diameter of annular chamber 121, air-flow can form certain vortex, into buffering connecting leg
124 air-flow velocity reduces.
Because flow velocity reduces, after air-flow is entered in liquid from buffering connecting leg 124 bottom, the bubble formed is relatively
It is small, the increase of its specific surface area contacted with liquid, help to absorb the pernicious gas in gas.If set in addition, not buffering
Put, air-flow directly impacts the bottom of tank body 11, there is certain infringement to tank body 11, and passes through after buffering, can reduce this damage
Evil, extend the service life of tank body.
According to the characteristics of the system, when carrying out vent gas treatment, its process is：The tail gas that 2# absorption towers 007 are discharged passes through
Inlet pipeline 13 enters annular chamber 121, and the steel wool 122 in annular chamber 121 passes through again to gas filtering buffering, mixed gas
Buffering connecting leg 124 is entered in tank body 11 to be contacted with absorbing liquid, is finally discharged into the bottom of exhaust gas treating device 014 by outlet conduit 16
Portion.
Embodiment 5
The formaldehyde preparation method of the present embodiment, its difference are：Tank body 11 and water circulation system phase in the present embodiment
Even, it is circulation aqueous in tank body 11, then unsaturated state can be at by recirculated water, there is stronger adsorption capacity,
Improve assimilation effect.
Further, in order to improve buffering effect, screen cloth 123 is provided with annular chamber 121, it is positioned at buffering connecting leg
124 porch.Screen cloth 123 has certain barrier effect to air-flow.In addition, the gas of discharge is gas liquid mixture, pass through institute
Screen cloth is set to be filtered to air-flow.
Embodiment 6
The formaldehyde preparation method of the present embodiment, its difference are：Screen cloth 123 is provided with annular chamber 121, it is located at
The middle part of annular chamber 121, as shown in figure 4, being provided with buffering filler above screen cloth 123, the buffering filler is steel wool 122.
What deserves to be explained is steel wool 122 is finer and closely woven relative to screen cloth, there is more preferable choked flow effect, buffering can be improved
Effect.But if steel wool is arranged on the porch of buffering connecting leg 124, the pressure of air-flow can make its have it is certain pile up, hold
The buffering entrance of connecting leg 124 is easily blocked, then air-flow is difficult to enter in buffering connecting leg 124.And screen cloth 123 is arranged on ring by the present embodiment
The middle part of shape chamber 121, its downside still have larger circulation area, while row buffering is entered, will not cause Airflow obstruction, tied
Structure sets reasonable.
Embodiment 7
The formaldehyde preparation method of the present embodiment, its difference are：With reference to Fig. 5, the side wall of tank body 11 is provided with U-shaped control position
Pipe.U-shaped control position pipe connects with tank interior, it can be arranged on specified altitude assignment as needed, when liquid level amount increase, liquid
Cognition flows outwardly automatically by the U-shaped control position pipe, can be good at controlling liquid level, it is not necessary to manual adjustment.
Schematically the present invention and embodiments thereof are described above, this describes no restricted, institute in accompanying drawing
What is shown is also one of embodiments of the present invention, and actual structure is not limited thereto.So if common skill of this area
Art personnel are enlightened by it, without departing from the spirit of the invention, without designing and the technical scheme for creativeness
Similar frame mode and embodiment, protection scope of the present invention all should be belonged to.
Claims (10)
1. a kind of pipeline mixes oxygen formula formaldehyde preparation method, it is characterised in that：The drainage conduit of the blender (003) of used system with
Filter (004) is connected, and mixed material is delivered into oxidator (005), is connected with the drainage conduit of the blender (003)
The blast pipe of air heater (011)；Its preparation process is：
S1：Prepare methanol, tail gas, vapor, the conveying of air and the preparation of gaseous mixture, methanol, tail gas, vapor are being mixed
Mixed in device (003), the air of air heater (011) discharge mixes with the gas that blender (003) exports in pipeline, so
Enter filter (004) afterwards and carry out fire-retardant filtering；
S2：After material mixed gas enter oxidator (005), oxidation, the dehydrogenation of methanol are carried out in the presence of catalyst for electrolytic silver
Reaction, reaction temperature are controlled at 590~630 DEG C, generate formaldehyde and part accessory substance；
S3：Formaldehyde gaseous mixture is absorbed by process water, carries out aldehyde, alcohol separation, and the formaldehyde after separation remains as finished product folding and unfolding
Remaining formaldehyde gas is discharged by the tower top of 1# absorption towers (006), and resorption, residual gas conduct are continued into 2# absorption towers (007)
Tail gas is handled.
2. a kind of pipeline according to claim 1 mixes oxygen formula formaldehyde preparation method, it is characterised in that：The blender
(003) angle is 70~82 ° between drainage conduit and the blast pipe of oxidator (005), and junction is held apart from filter (004)
Mouth is not less than 1m.
3. a kind of pipeline according to claim 2 mixes oxygen formula formaldehyde preparation method, it is characterised in that：The oxidator
(005) oxidized tail gas is delivered to 1# absorption towers (006), 2# absorption towers (007) successively, 2# absorption towers (007) discharge
A tail gas part is delivered to blender (003) after being heated, another part is delivered to after being filtered absorption of by liquid seal trough (013)
Exhaust gas treating device (014).
4. a kind of pipeline according to claim 3 mixes oxygen formula formaldehyde preparation method, it is characterised in that：The liquid seal trough
(013) include tank body (11) and the explosion stack (14) at the top of tank body (11), control valve is connected with the explosion stack (14)
(15), the connection position of explosion stack (14) and tank body (11) is provided with pressure sensor, when pressure sensor detects tank body
(11) when interior pressure exceedes the limiting value of setting, control valve (15) automatically opens up, and is exhausted by explosion stack (14).
5. a kind of pipeline according to claim 4 mixes oxygen formula formaldehyde preparation method, it is characterised in that：Tank body (11) top
Portion is additionally provided with buffer (12), and the inlet pipeline (13) on the buffer (12) is connected with absorption tower (2), passes through buffer
(12) tail gas flow velocity is reduced.
6. a kind of pipeline according to claim 5 mixes oxygen formula formaldehyde preparation method, it is characterised in that：The buffer (12)
Mainly it is made up of annular chamber (121) and buffering connecting leg (124), annular chamber (121) upper end is connected with inlet pipeline (13), ring
The buffering connecting leg (124) of shape chamber (121) lower end is passed through tank body (11) bottom；Annular chamber (121) diameter be more than inlet pipeline (13),
Buffer the diameter of connecting leg (124).
7. a kind of pipeline according to claim 6 mixes oxygen formula formaldehyde preparation method, it is characterised in that：The annular chamber
(121) screen cloth (123) is provided with, it is positioned at the porch of buffering connecting leg (124).
8. a kind of pipeline according to claim 6 mixes oxygen formula formaldehyde preparation method, it is characterised in that：The annular chamber
(121) screen cloth (123) is provided with, it is located in the middle part of annular chamber (121), and buffering filler is provided with above screen cloth (123).
9. a kind of pipeline according to claim 8 mixes oxygen formula formaldehyde preparation method, it is characterised in that：It is described buffering filler be
Steel wool (122).
10. a kind of pipeline according to claim 9 mixes oxygen formula formaldehyde preparation method, it is characterised in that：2# absorption towers (007)
The tail gas of discharge enters annular chamber (121) by inlet pipeline (13), and the steel wool (122) in annular chamber (121) is to gas
Filtering buffering, mixed gas is entered in tank body (11) by buffering connecting leg (124) contacted with absorbing liquid again, finally by exporting
Pipeline (16) is discharged into exhaust gas treating device (014) bottom.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710564103.4A CN107382685A (en) | 2017-07-12 | 2017-07-12 | A kind of pipeline mixes oxygen formula formaldehyde preparation method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108295786A (en) * | 2018-04-13 | 2018-07-20 | 绿城农科检测技术有限公司 | A kind of thermal desorption ageing device |
| CN110759823A (en) * | 2019-09-23 | 2020-02-07 | 扬州市众鑫化工有限公司 | Preparation method of low-concentration formaldehyde solution for water-based binder |
| CN114643022A (en) * | 2020-12-21 | 2022-06-21 | 浙江国宇塑业有限公司 | Explosion-proof type formaldehyde apparatus for producing |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105294414A (en) * | 2015-11-19 | 2016-02-03 | 安徽中源化工有限公司 | Formaldehyde production system |
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- 2017-07-12 CN CN201710564103.4A patent/CN107382685A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105294414A (en) * | 2015-11-19 | 2016-02-03 | 安徽中源化工有限公司 | Formaldehyde production system |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108295786A (en) * | 2018-04-13 | 2018-07-20 | 绿城农科检测技术有限公司 | A kind of thermal desorption ageing device |
| CN110759823A (en) * | 2019-09-23 | 2020-02-07 | 扬州市众鑫化工有限公司 | Preparation method of low-concentration formaldehyde solution for water-based binder |
| CN114643022A (en) * | 2020-12-21 | 2022-06-21 | 浙江国宇塑业有限公司 | Explosion-proof type formaldehyde apparatus for producing |
| CN114643022B (en) * | 2020-12-21 | 2023-11-28 | 浙江国宇塑业有限公司 | Explosion-proof formaldehyde apparatus for producing |
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