CN211677120U - Cyclohexanecarboxylic acid tail gas recovery device - Google Patents
Cyclohexanecarboxylic acid tail gas recovery device Download PDFInfo
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- CN211677120U CN211677120U CN201922307321.7U CN201922307321U CN211677120U CN 211677120 U CN211677120 U CN 211677120U CN 201922307321 U CN201922307321 U CN 201922307321U CN 211677120 U CN211677120 U CN 211677120U
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- tail gas
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Abstract
A cyclohexanecarboxylic acid tail gas recovery device comprises a catcher (2) communicated with a tail gas discharge device (1); a water jet unit (5) in communication with the trap (2); a fan (6) communicated with the water injection unit (5); the spray tower (7) is communicated with the outlet of the fan (6); and the activated carbon adsorption device (8) is communicated with the outlet of the spray tower (7). The utility model provides a technical scheme retrieves most VOCs through trap (2), and the VOCs that trap (2) retrieved can be used for production system again to the resource has been practiced thrift. The VOCs in the tail gas generated in the production process of the cyclohexanecarboxylic acid prepared by the reaction of the benzoic acid and the hydrogen can be effectively purified by the water injection unit (5) and the secondary NaOH solution adsorption of the spray tower (7) and the adsorption of the activated carbon adsorption device (8), and the discharge concentration of the VOCs is low.
Description
Technical Field
The utility model relates to a tail gas emission reduction device in the cyclohexanecarboxylic acid production process especially relates to a cyclohexanecarboxylic acid tail gas recovery device.
Background
The cyclohexanecarboxylic acid can be used for synthesizing antiprogestational 392 medicines and praziquantel medicines for treating schistosomiasis; it can also be used as vulcanized rubber compatibilizer, petroleum clarifier, pesticide, dye and other organic compounds. The preparation method of the cyclohexanecarboxylic acid is up to more than twenty kinds, wherein a Grignard reagent method, a benzoic acid catalytic hydrogenation method, a cyclohexene carbon monoxide addition method and a method using cyclohexanone as a raw material are preferred. The reaction of benzoic acid and hydrogen in the presence of catalyst to produce cyclohexanecarboxylic acid is an economical production method. The method generates VOCs in a benzoic acid melting kettle, generates tail gas in a hydrogenation reaction kettle and a rectification device, and discharges the tail gas after reaching the standard after treating the waste gas. In some old facilities, sufficient attention has not been paid or the degree of harmless treatment is low.
SUMMERY OF THE UTILITY MODEL
The not enough to prior art, the utility model aims to solve the technical problem that a VOCs tail gas that can effectively purify benzoic acid and hydrogen reaction preparation cyclohexanecarboxylic acid production process and produce is provided to resource in the ability recycle tail gas.
In order to solve the technical problem, the utility model provides a cyclohexanecarboxylic acid tail gas recovery device, which comprises a catcher communicated with a tail gas discharge device; a water jet unit communicated with the catcher; the fan is communicated with the water injection unit; the spray tower is communicated with the outlet of the fan; and the activated carbon adsorption device is communicated with the outlet of the spray tower.
As a further improvement technical scheme, the utility model provides a cyclohexanecarboxylic acid tail gas recovery unit still has the buffer tank between trap and water injection unit.
As a further improvement technical scheme, the utility model provides a cyclohexanecarboxylic acid tail gas recovery device still have with the fan of water injection unit export intercommunication.
As a further improvement technical scheme, the utility model provides a cyclohexanecarboxylic acid tail gas recovery unit, exhaust emission equipment includes at least one of hydrogenation cauldron, rectifier unit or benzoic acid melting cauldron.
As a further improvement technical scheme, the utility model provides a cyclohexanecarboxylic acid tail gas recovery unit still has the condenser between trap and exhaust emission equipment.
The aforementioned improvements can be implemented individually or in combination without conflict.
The utility model provides a technical scheme retrieves most VOCs through the trap, and the VOCs (benzoic acid or cyclohexanecarboxylic acid) that the trap was retrieved can be used back in production system to the resource has been practiced thrift. The VOCs in the tail gas generated in the production process of preparing the cyclohexanecarboxylic acid by reacting benzoic acid with hydrogen can be effectively purified through the water injection unit and the adsorption of the secondary NaOH solution of the spray tower and the adsorption of the activated carbon adsorption device, and the discharge concentration of the VOCs is low.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation to the invention. In the drawings:
FIG. 1 is a schematic diagram of the structural principle of the tail gas recovery device of the embodiment.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
The cyclohexanecarboxylic acid tail gas recovery device shown in fig. 1 comprises a catcher 2 communicated with a tail gas discharge device 1, a water injection unit 5 communicated with the catcher 2, a fan 6 communicated with the water injection unit 5, a spray tower 7 communicated with an outlet of the fan 6, and an activated carbon adsorption device 8 communicated with an outlet of the spray tower 7.
In the production process of preparing the cyclohexanecarboxylic acid by reacting the benzoic acid with hydrogen, VOCs can be generated in a benzoic acid melting kettle, and tail gas can be generated in a hydrogenation reaction kettle and a rectifying device. The tail gas is collected by the collector 2 to recover most volatile organic compounds, and the recovered organic compounds can be returned to the synthesis system for use. The tail gas enters a water injection unit 5 after passing through a trap 2, VOCs in the tail gas are absorbed by using NaOH solution in the water injection unit 5, the tail gas treated by the water injection unit 5 enters a spray tower 7 after being pressurized by a fan 6, the VOCs in the tail gas are continuously absorbed by using NaOH solution as circulating liquid in the spray tower 7, the tail gas treated by the absorption of a secondary NaOH solution enters an activated carbon adsorption device 8, and other impurities are adsorbed by the activated carbon adsorption device 8 and then are discharged to the atmosphere.
The utility model provides a technical scheme retrieves most VOCs through trap 2, and the VOCs (benzoic acid or cyclohexanecarboxylic acid) that trap 2 retrieved can be used for production system again to the resource has been practiced thrift. Through the adsorption of the water injection unit 5 and the second-stage NaOH solution of the spray tower 7 and the adsorption of the activated carbon adsorption device 8, VOCs in tail gas generated in the production process of preparing the cyclohexanecarboxylic acid by reacting benzoic acid with hydrogen can be effectively purified, and the emission concentration of the VOCs is low.
Optionally, the cyclohexanecarboxylic acid tail gas recovery device is further provided with a buffer tank 3 between the catcher 2 and the water spraying unit 5. The buffer tank 3 plays a role in stabilizing production.
Optionally, the cyclohexanecarboxylic acid tail gas recovery device is further provided with a fan 6 communicated with the outlet of the water spraying unit 5. The pressure of the tail gas entering the spray tower 7 is increased by the pressurization of the fan 6.
Optionally, the tail gas emission device 1 of the cyclohexanecarboxylic acid recovery device at least comprises one of a hydrogenation reactor, a rectification device or a benzoic acid melting kettle.
The tail gas recovery device of the cyclohexanecarboxylic acid is also provided with a condenser (not shown in the figure) between the catcher and the tail gas discharge device. VOCs in the tail gas is condensed by the condenser, so that the tail gas can be collected by the catcher 2 conveniently.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention in any way, and various modifications and variations will be apparent to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. The cyclohexanecarboxylic acid tail gas recovery device is characterized by comprising a catcher (2) communicated with tail gas emission equipment (1); a water jet unit (5) in communication with the trap (2); a fan (6) communicated with the water injection unit (5); the spray tower (7) is communicated with the outlet of the fan (6); and the activated carbon adsorption device (8) is communicated with the outlet of the spray tower (7).
2. The cyclohexanecarboxylic acid tail gas recovery device according to claim 1, wherein a buffer tank (3) is further provided between the trap (2) and the water injection unit (5).
3. The cyclohexanecarboxylic acid tail gas recovery device according to claim 1, further comprising a fan (6) in communication with the outlet of the water injection unit (5).
4. The cyclohexanecarboxylic acid tail gas recovery device according to claim 1, wherein the tail gas discharge equipment (1) comprises at least one of a hydrogenation reactor, a rectification device or a benzoic acid melting kettle.
5. The cyclohexanecarboxylic acid tail gas recovery device according to claim 1, wherein a condenser is further provided between the trap (2) and the tail gas discharge apparatus (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922307321.7U CN211677120U (en) | 2019-12-20 | 2019-12-20 | Cyclohexanecarboxylic acid tail gas recovery device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922307321.7U CN211677120U (en) | 2019-12-20 | 2019-12-20 | Cyclohexanecarboxylic acid tail gas recovery device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211677120U true CN211677120U (en) | 2020-10-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922307321.7U Active CN211677120U (en) | 2019-12-20 | 2019-12-20 | Cyclohexanecarboxylic acid tail gas recovery device |
Country Status (1)
| Country | Link |
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| CN (1) | CN211677120U (en) |
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2019
- 2019-12-20 CN CN201922307321.7U patent/CN211677120U/en active Active
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