CN210145804U - Tail gas purification treatment system for dichlorophenol production - Google Patents
Tail gas purification treatment system for dichlorophenol production Download PDFInfo
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- CN210145804U CN210145804U CN201920967988.7U CN201920967988U CN210145804U CN 210145804 U CN210145804 U CN 210145804U CN 201920967988 U CN201920967988 U CN 201920967988U CN 210145804 U CN210145804 U CN 210145804U
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- absorption tower
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
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Abstract
The tail gas purification treatment system for dichlorophenol production comprises a hydrogen chloride recovery system and a tail gas absorption system, wherein the tail gas absorption system is connected to the downstream of the hydrogen chloride recovery system, the hydrogen chloride recovery system comprises a purification tower, a graphite falling film absorber and a hydrochloric acid absorption tank, a graphite condenser is arranged on an upstream pipeline of the purification tower, the graphite falling film absorber is connected with an exhaust pipeline of the purification tower and leads to the hydrochloric acid absorption tank and the tail gas absorption system, the tail gas absorption system comprises a primary absorption tower, a secondary absorption tower and a tertiary absorption tower which are connected in series, wherein the primary absorption tower is connected with pure water, the tertiary absorption tower is connected with alkali liquor, and the top of the tertiary absorption tower is connected to an emptying chimney through a fan. The utility model discloses the design is novel, and design benefit has both avoided the waste of resource, has retrieved hydrochloric acid as the by-product, and the further process of having simplified tail gas treatment has again reduced manpower and materials consumption, the effectual polluted environment that avoids, and environmental protection and energy saving are effectual.
Description
Technical Field
The utility model relates to a chemical process field specifically is to tail gas purification's equipment in dichlorophenol technology is produced to cyclohexanone.
Background
Diclofenac is the free acid of diclofenac. Diclofenac sodium is a third-generation non-steroidal potent anti-inflammatory analgesic, is marketed in China in the middle of the 80 th century, and is clinically used for various rheumatic arthritis, lupus erythematosus, neuritis, cancer, pain caused after operation, fever caused by various reasons and the like. The existing diclofenac sodium is prepared by the following steps: the method comprises the steps of preparing dichlorophenol by taking cyclohexanone as a raw material, preparing diphenylamine by taking dichlorophenol as a raw material and preparing diclofenac sodium by taking diphenylamine as a raw material, wherein the preparation of dichlorophenol by taking cyclohexanone as a raw material is an important ring.
The preparation of dichlorophenol by taking cyclohexanone as a raw material mostly adopts the steps of introducing chlorine into the cyclohexanone in a chlorination reaction kettle to produce tetrachloro cyclic ketone, and then heating and decomposing the tetrachloro cyclic ketone into 2, 6-dichlorophenol in a dehydrochlorination reaction kettle, wherein more acidic waste gas can be generated in the process, the acidic waste gas cannot be directly discharged into the air, the environment can be seriously polluted, and the serious waste of resources can be caused. In order to save resources and avoid environmental pollution, people try to improve the process and the device for purifying and recovering the tail gas by various methods to more effectively meet various requirements.
SUMMERY OF THE UTILITY MODEL
In order to solve the defects of the prior art, the utility model provides a tail gas purification treatment system for dichlorophenol production, which can effectively recover the effective components in the tail gas and purify and absorb the tail gas, thereby achieving the purposes of saving and environmental protection.
The to-be-solved technical problem of the utility model is realized through following technical scheme:
a tail gas purification treatment system for dichlorophenol production comprises a hydrogen chloride recovery system and a tail gas absorption system, wherein the hydrogen chloride recovery system is connected to a chlorination reaction kettle and a dehydrochlorination kettle in the dichlorophenol production process, the tail gas absorption system is connected to the downstream of the hydrogen chloride recovery system, the hydrogen chloride recovery system comprises a purification tower, a graphite falling film absorber and a hydrochloric acid absorption tank which are arranged in series, a graphite condenser is arranged on an upstream pipeline of the purification tower, the graphite falling film absorber is connected with an exhaust pipeline of the purification tower, and leads to a hydrochloric acid absorption tank and a tail gas absorption system, wherein the tail gas absorption system comprises a first-stage absorption tower, a second-stage absorption tower and a third-stage absorption tower which are arranged in series, wherein the lower part of the first-stage absorption tower is connected with pure water, the lower part of the second-stage absorption tower is connected with the third-stage absorption tower, the lower part of the third-stage absorption tower is connected with alkali liquor, and the top of the third-stage absorption tower is connected to an emptying chimney through a fan.
The utility model discloses in, one-level absorption tower, second grade absorption tower and tertiary absorption tower are the spray column, and the admission line setting is in the lower part, and the pipeline of giving vent to anger is located the top, is provided with the shower that sprays the absorption solvent in the spray column.
Further, the first-stage absorption tower, the second-stage absorption tower and the third-stage absorption tower adopt a circulating pump and a circulating pipeline to recycle the absorption solvent, namely the absorption solvent is sent to the top of the first-stage absorption tower from the bottom of the first-stage absorption tower through the circulating pump and the circulating pipeline, and the absorption solvent of the first-stage absorption tower is pure water; the bottom of the third-stage absorption tower sends an absorption solvent to the top of the third-stage absorption tower through a circulating pump and a circulating pipeline, the absorption solvent of the third-stage absorption tower is alkali liquor, the circulating pipeline of the third-stage absorption tower is connected to the lower part of the second-stage absorption tower, and the absorption solvent in the circulating pipeline is sent into the second-stage absorption tower; and the bottom of the second-stage absorption tower sends the absorption solvent to the top of the second-stage absorption tower through a circulating pump and a circulating pipeline, and the absorption solvent of the second-stage absorption tower is a recycling solution of the absorption solvent of the third-stage absorption tower.
Furthermore, the circulating pipelines of the second-stage absorption tower and the third-stage absorption tower are both provided with PP (polypropylene) heat exchangers for absorbing heat released by acid-base neutralization in the second-stage absorption tower and the third-stage absorption tower.
Furthermore, a recycling storage tank is connected to a circulating pipeline of the secondary absorption tower, and the alkali liquor after absorption treatment is recycled and stored for post-treatment.
Furthermore, a circulating pipeline of the primary absorption tower is connected to a hydrochloric acid absorption tank through a vacuum unit, and the absorption solvent absorbed in the primary absorption tower is sent to the hydrochloric acid absorption tank.
Furthermore, a circulation loop is arranged at the vacuum unit and provided with a circulation pump and a graphite heat exchanger for cooling the washing solvent.
The utility model discloses in, the hydrochloric acid absorption tank passes through circulating pump and circulating line and flows back solution to graphite falling film absorber the place ahead for solution fully absorbs hydrogen chloride gas, connects the hydrochloric acid storage tank on the circulating line of hydrochloric acid absorption tank, will absorb complete hydrochloric acid and preserve.
Furthermore, a pure water pipeline is connected outside the hydrochloric acid absorption tank to supplement the hydrogen chloride absorption solution.
The utility model discloses in, tail gas absorption system still connects to other reation kettle in the dichlorophenol production process, and the waste gas that produces is directly absorbed and is handled operations such as mixing, stirring, layering.
The utility model discloses in, the pipeline that hydrogen chloride recovery system and tail gas absorption system adopted is PP (polypropylene) pipeline, avoids corroding.
The utility model discloses in, adopted earlier to retrieve the mode of reprocessing to tail gas, earlier through purifying and retrieving, absorb the hydrochloric acid for can recycling with the hydrogen chloride in the tail gas, absorb the processing to surplus waste gas again, tail gas absorbing technology has adopted one-level, second grade, tertiary absorption tower, utilizes different absorption solution respectively, carries out the gradient processing that the degree is different. The first-level absorption tower absorbs residual hydrogen chloride gas and returns to the hydrochloric acid absorption tank to participate in the recovery of hydrochloric acid, the third-level absorption tower is used as a final absorption tower, the acidity in tail gas needs to be thoroughly neutralized, alkali liquor is used for neutralization, the second-level absorption tower is used as absorption equipment between the first-level absorption tower and the third-level absorption tower, pretreatment needs to be carried out, waste alkali liquor used by the third-level absorption tower is used for primary absorption of waste gas, and finally generated waste alkali liquor is led out for post-treatment. After the purification, recovery and absorption in the process, the acid tail gas produced by the dichlorophenol is treated and can be directly discharged into the atmosphere without influencing the environment.
Compared with the prior art, the utility model discloses the design is novel, and design benefit retrieves and two links are absorbed to tail gas through purifying, carries out effectual recovery and processing with the acid tail gas of dichlorophenol production, has both avoided the waste of resource, has retrieved hydrochloric acid as the byproduct, and the further technology of having simplified tail gas treatment again has reduced manpower and materials consumption, the effectual polluted environment that avoids, and environmental protection and energy saving are effectual.
Drawings
Fig. 1 is a layout diagram of the connection of the devices of the present invention.
In the figure: the device comprises a purification tower 1, a graphite falling film absorber 2, a hydrochloric acid absorption tank 3, a vacuum unit 4, a graphite heat exchanger 5, a circulating pump 6, a primary absorption tower 7, a secondary absorption tower 8, a tertiary absorption tower 9, a PP heat exchanger 10, a fan 11 and a chimney 12.
Detailed Description
The invention will be further described with reference to the drawings and specific preferred embodiments without limiting the scope of the invention.
Referring to fig. 1, the tail gas purification treatment system for dichlorophenol production shown in fig. 1 comprises a hydrogen chloride recovery system and a tail gas absorption system, wherein the hydrogen chloride recovery system is connected to a chlorination reaction kettle and a dehydrochlorination kettle in the dichlorophenol production process and comprises a purification tower 1, a graphite falling film absorber 2 and a hydrochloric acid absorption tank 3, a graphite condenser is arranged on an upstream pipeline of the purification tower 1, and the graphite falling film absorber 2 is connected with an exhaust pipeline of the purification tower 1 and leads to the hydrochloric acid absorption tank 3 and the tail gas absorption system; the hydrochloric acid absorption tank 3 returns the solution to the front of the graphite falling film absorber 2 through the circulating pump 6 and the circulating pipeline, so that the solution can fully absorb hydrogen chloride gas, the circulating pipeline of the hydrochloric acid absorption tank 3 is connected with a hydrochloric acid storage tank, and the hydrochloric acid absorption tank 3 is externally connected with a pure water pipeline.
The tail gas absorption system is connected with the downstream of the hydrogen chloride recovery system, receives tail gas from the hydrogen chloride recovery system and waste gas generated by mixing, stirring, layering and other operations of other reaction kettles in the production process of dichlorophenol, and comprises a first-stage absorption tower 7, a second-stage absorption tower 8 and a third-stage absorption tower 9 which are arranged in series, wherein the first-stage absorption tower 7 is connected with pure water, the third-stage absorption tower 9 is connected with alkali liquor, and the top of the third-stage absorption tower 9 is connected to an emptying chimney 12 through a fan 11.
One-level absorption tower 7, second grade absorption tower and tertiary absorption tower 9 are spray towers, and the admission line sets up in the lower part, and the pipeline of giving vent to anger is located the top, is provided with the shower that sprays the absorption solvent in the spray tower, one-level absorption tower 7, second grade absorption tower 8 and tertiary absorption tower 9 all adopt circulating pump 6 and circulating pipeline to carry out cyclic utilization to the absorption solvent: namely, the bottom of the first-stage absorption tower 7 sends the absorption solvent to the top of the first-stage absorption tower 7 through the circulating pump 6 and the circulating pipeline, and the absorption solvent of the first-stage absorption tower 7 is pure water; the bottom of the third-stage absorption tower 9 sends an absorption solvent to the top of the third-stage absorption tower 9 through a circulating pump 6 and a circulating pipeline, the absorption solvent of the third-stage absorption tower 9 is an alkali liquor, the circulating pipeline of the third-stage absorption tower 9 is connected to the lower part of the second-stage absorption tower 8, and the absorption solvent in the circulating pipeline is sent into the second-stage absorption tower 8; the bottom of the second-stage absorption tower 8 sends the absorption solvent to the top of the second-stage absorption tower 8 through the circulating pump 6 and the circulating pipeline, and the absorption solvent of the second-stage absorption tower 8 is the reuse solution of the absorption solvent of the third-stage absorption tower 9.
All be provided with PP heat exchanger 10 on the circulating line of second grade absorption tower 8 and tertiary absorption tower 9, absorb the heat that acid-base neutralization was given off in second grade absorption tower 8 and the tertiary absorption tower 9, be connected with the recovery storage tank on the circulating line of second grade absorption tower 8, retrieve the storage in order to carry out the aftertreatment to the alkali lye after the absorption treatment.
The circulating pipeline of the primary absorption tower 7 is connected to the hydrochloric acid absorption tank 3 through the vacuum unit 4, the absorption solvent absorbed in the primary absorption tower 7 is sent to the hydrochloric acid absorption tank 3, the vacuum unit 4 is provided with a circulating loop, the circulating loop is provided with a circulating pump 6 and a graphite heat exchanger 5, and the washing solvent is cooled.
In the production process of dichlorophenol, cyclohexanone is added into a chlorination reaction kettle to react to generate tetrachloro cyclic ketone and hydrogen chloride gas, a layering kettle and a desolventizing kettle recover a solvent, the tetrachloro cyclic ketone enters a dehydrochlorination kettle to be heated and decomposed, and the dichlorophenol and the hydrogen chloride gas are generated by reaction. And the residual tail gas which is not processed by the graphite falling film absorber 3 is sent into a tail gas absorption system together with the tail gas generated by reaction containers such as a layering kettle, a desolventizing kettle and the like, and is sequentially subjected to gradient neutralization absorption by a primary absorption tower 7, a secondary absorption tower 8 and a tertiary absorption tower 9 to become harmless gas, the harmless gas is pushed by a fan 11 and is discharged by a chimney 12, in the process of absorption neutralization, the primary absorption tower 7 firstly uses pure water as an absorption solvent to absorb the residual hydrogen chloride gas in the tail gas and sends the residual hydrogen chloride gas back to the hydrochloric acid absorption tank 3 through a vacuum unit 4, the secondary absorption tower 8 primarily neutralizes and absorbs the tail gas, the tertiary absorption tower 9 uses alkali liquor as the absorption solvent to completely neutralize and absorb, all acid components in the tail gas are removed, so that the tail gas can reach the standard of being discharged into the atmospheric environment, and the whole tail gas purification treatment process is completed.
Combine above-mentioned equipment arrangement and working process to discover, the utility model discloses the design is novel, and design benefit has both avoided the waste of resource, has retrieved hydrochloric acid as the by-product, and the further technology of having simplified tail gas treatment has again reduced manpower and materials consumption, the effectual polluted environment that avoids, environmental protection and energy saving are effectual.
Claims (9)
1. The tail gas purification treatment system for dichlorophenol production is characterized in that: including hydrogen chloride recovery system and tail gas absorption system, hydrogen chloride recovery system is connected to chlorination reation kettle and the dehydrochlorination cauldron in the dichlorophenol production process, and tail gas absorption system connects the low reaches at hydrogen chloride recovery system, hydrogen chloride recovery system is including the purification tower, graphite falling film absorber and the hydrochloric acid absorption tank that establish ties and set up, is provided with the graphite condenser on the upstream pipeline of purification tower, and the exhaust duct of purification tower is connected to graphite falling film absorber to lead to hydrochloric acid absorption tank and tail gas absorption system, tail gas absorption system is including the one-level absorption tower, second grade absorption tower and the tertiary absorption tower that establish ties and set up, and wherein one-level absorption tower lower part inserts the pure water, and second grade absorption tower lower part is connected with tertiary absorption tower, and tertiary absorption tower lower part inserts alkali lye, and the top of tertiary absorption tower is connected to the chimney of unloading through the fan.
2. The system for purifying and treating the tail gas generated in the production of dichlorophenol according to claim 1, characterized in that: the first-stage absorption tower, the second-stage absorption tower and the third-stage absorption tower are all spray towers, an air inlet pipeline is arranged at the lower part, an air outlet pipeline is positioned at the top part, and spray pipes for spraying absorption solvents are arranged in the spray towers.
3. The system for purifying and treating the tail gas generated in the production of dichlorophenol according to claim 2, characterized in that: the first-stage absorption tower, the second-stage absorption tower and the third-stage absorption tower adopt a circulating pump and a circulating pipeline to recycle the absorption solvent, namely the bottom of the first-stage absorption tower sends the absorption solvent to the top of the first-stage absorption tower through the circulating pump and the circulating pipeline, and the absorption solvent of the first-stage absorption tower is pure water; the bottom of the third-stage absorption tower sends an absorption solvent to the top of the third-stage absorption tower through a circulating pump and a circulating pipeline, the absorption solvent of the third-stage absorption tower is alkali liquor, the circulating pipeline of the third-stage absorption tower is connected to the lower part of the second-stage absorption tower, and the absorption solvent in the circulating pipeline is sent into the second-stage absorption tower; and the bottom of the second-stage absorption tower sends the absorption solvent to the top of the second-stage absorption tower through a circulating pump and a circulating pipeline, and the absorption solvent of the second-stage absorption tower is a recycling solution of the absorption solvent of the third-stage absorption tower.
4. The system for purifying and treating the tail gas generated in the production of dichlorophenol according to claim 3, characterized in that: and PP heat exchangers are arranged on the circulating pipelines of the second-stage absorption tower and the third-stage absorption tower.
5. The system for purifying and treating the tail gas generated in the production of dichlorophenol according to claim 3, characterized in that: and a recycling storage tank is connected to the circulating pipeline of the secondary absorption tower.
6. The system for purifying and treating the tail gas generated in the production of dichlorophenol according to claim 3, characterized in that: and the circulating pipeline of the primary absorption tower is connected to the hydrochloric acid absorption tank through a vacuum unit.
7. The system for purifying and treating the tail gas generated in the production of dichlorophenol according to claim 6, characterized in that: and a circulation loop is arranged at the vacuum unit and provided with a circulation pump and a graphite heat exchanger.
8. The system for purifying and treating the tail gas generated in the production of dichlorophenol according to claim 1, characterized in that: the hydrochloric acid absorption tank returns the solution to the front of the graphite falling film absorber through a circulating pump and a circulating pipeline, and the circulating pipeline of the hydrochloric acid absorption tank is connected with a hydrochloric acid storage tank.
9. The system for purifying and treating the tail gas generated in the production of dichlorophenol according to claim 8, characterized in that: and a pure water pipeline is connected outside the hydrochloric acid absorption tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920967988.7U CN210145804U (en) | 2019-06-26 | 2019-06-26 | Tail gas purification treatment system for dichlorophenol production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920967988.7U CN210145804U (en) | 2019-06-26 | 2019-06-26 | Tail gas purification treatment system for dichlorophenol production |
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| Publication Number | Publication Date |
|---|---|
| CN210145804U true CN210145804U (en) | 2020-03-17 |
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| CN201920967988.7U Expired - Fee Related CN210145804U (en) | 2019-06-26 | 2019-06-26 | Tail gas purification treatment system for dichlorophenol production |
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| CN (1) | CN210145804U (en) |
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- 2019-06-26 CN CN201920967988.7U patent/CN210145804U/en not_active Expired - Fee Related
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Granted publication date: 20200317 Termination date: 20210626 |