CN108939861B - 2,4-D waste gas treatment method - Google Patents

2,4-D waste gas treatment method Download PDF

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CN108939861B
CN108939861B CN201810852637.1A CN201810852637A CN108939861B CN 108939861 B CN108939861 B CN 108939861B CN 201810852637 A CN201810852637 A CN 201810852637A CN 108939861 B CN108939861 B CN 108939861B
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gas
waste gas
treating
hcl
chlorine
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CN108939861A (en
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王卫星
徐占平
鲁志东
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Changfeng Chemical (Jilin) Co.,Ltd.
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Jiangsu Changfeng Agrochemical Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/68—Halogens or halogen compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
    • B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
    • B01D53/1406—Multiple stage absorption
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
    • B01D53/1456—Removing acid components
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
    • B01D53/1487—Removing organic compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
    • B01D53/18—Absorbing units; Liquid distributors therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/26—Drying gases or vapours
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B1/00—Electrolytic production of inorganic compounds or non-metals
    • C25B1/01—Products
    • C25B1/02—Hydrogen or oxygen
    • C25B1/04—Hydrogen or oxygen by electrolysis of water
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B1/00—Electrolytic production of inorganic compounds or non-metals
    • C25B1/01—Products
    • C25B1/24—Halogens or compounds thereof
    • C25B1/26—Chlorine; Compounds thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
    • B01D2252/10—Inorganic absorbents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
    • B01D2252/10—Inorganic absorbents
    • B01D2252/103—Water
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
    • B01D2253/10—Inorganic adsorbents
    • B01D2253/102—Carbon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2256/00—Main component in the product gas stream after treatment
    • B01D2256/26—Halogens or halogen compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/20—Halogens or halogen compounds
    • B01D2257/202—Single element halogens
    • B01D2257/2025—Chlorine
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/20—Halogens or halogen compounds
    • B01D2257/204—Inorganic halogen compounds
    • B01D2257/2045—Hydrochloric acid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/20—Halogens or halogen compounds
    • B01D2257/206—Organic halogen compounds
    • B01D2257/2064—Chlorine
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
    • B01D2257/702—Hydrocarbons
    • B01D2257/7027—Aromatic hydrocarbons
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/36—Hydrogen production from non-carbon containing sources, e.g. by water electrolysis

Abstract

The invention relates to the technical field of waste gas treatment, in particular to a method for treating 2,4-D waste gas. The method comprises the following steps: collecting HCL gas discharged by chlorination reaction and excessive chlorine gas, then burning hydrogen gas to generate HCL gas, dissolving HCL gas in water to form concentrated hydrochloric acid with the mass fraction of 26-32%, electrolyzing, recovering high-concentration chlorine gas and hydrogen gas generated by electrolysis, collecting chlorine gas, HCL gas, methylbenzene, dichlorophenol and trichlorophenol discharged by a system, then adopting a three-stage water falling film for absorption treatment, treating by a two-stage alkali liquor absorption tower, collecting trichlorophenoxyacetic acid, sodium chloride and HCl gas discharged in a dry mode, then treating by a two-stage alkali liquor absorption tower, mixing the tail gas after pretreatment, introducing into the two-stage alkali liquor absorption tower for treatment, then introducing into a spray tower, absorbing residual pollution factors in the waste gas, and then conveying to a high exhaust pipe through a pipeline for discharge. The invention has the advantages of good waste gas treatment effect, saving and environmental protection.

Description

2,4-D waste gas treatment method
Technical Field
The invention relates to the technical field of waste gas treatment, in particular to a method for treating 2,4-D waste gas.
Background
2,4-D is similar to auxin or other plant growth regulators, stimulates the growth, rejuvenates cells, can be absorbed by the roots and leaves of plants, influences the plant metabolism by stimulating the synthesis of nucleic acid and protein, and the like, belongs to a low-toxicity plant growth regulator, shows polar transportation in plants, and has an irreplaceable position in the biological field due to the special physiological action of 2, 4-D.
The 2,4-D also has certain toxicity, has certain harm to human and environment, can stimulate eyes and skin after being ingested or absorbed through skin, has damage effect on liver and heart after being repeatedly contacted, and can cause convulsion. Different amounts of 2,4-D applied to a certain target range can be distributed throughout the environment within hours or days by movement of air, water and soil. Vapor drift of the more volatile 2,4-D esters can lead to air pollution and crop damage, and these products are replaced by the less volatile 2,4-D derivatives. The use of 2,4-D to control aquatic weeds can cause contamination of irrigation and drinking water sources, and improper disposal techniques can also cause environmental contamination.
Therefore, the treatment of 2,4-D waste gas is important, and the waste gas generated in the 2,4-D production process mainly comprises HCl generated in the process of degassing by nitrogen after chlorination reaction and excessive Cl2The organic liquid phase is discharged into a rectifying still to generate dichlorophenol and trichlorophenol in the negative pressure rectifying process, the waste gas generated in the acidification and extraction processes of the alkaline high-salt mother liquor is mainly toluene, HCl and the like, and the common waste gas treatment method does not correspondingly absorb the waste gas generated at different parts and does not well solve the problem of effective gas recovery.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a method for treating 2,4-D waste gas. The invention has the advantages of good waste gas treatment effect, saving and environmental protection.
The purpose of the invention is realized by the following technical scheme:
a method for treating 2,4-D waste gas comprises pretreatment and centralized treatment, wherein the pretreatment comprises the following steps:
s1, collecting HCL gas discharged by chlorination reaction and excessive chlorine, drying and purifying the HCL gas, and combusting the HCL gas and hydrogen to generate HCL gas, wherein the HCL gas is dissolved in water to form concentrated hydrochloric acid with the mass fraction of 26-32%, the obtained concentrated hydrochloric acid is electrolyzed after passing through a cooler and an active carbon filter, and high-concentration chlorine and hydrogen generated by electrolysis are recovered;
s2, collecting chlorine, HCL gas, toluene, dichlorophenol and trichlorophenol discharged by the system, absorbing the chlorine, HCL gas, toluene, dichlorophenol and trichlorophenol by using a three-stage water falling film, and treating the chlorine, HCL gas, toluene, dichlorophenol and trichlorophenol by using a two-stage alkali liquor absorption tower;
s3, collecting the triclosan, sodium chloride and HCl gas discharged by drying, and treating the collected gas by a secondary alkali liquor absorption tower;
the centralized processing comprises the following steps:
t1, mixing the tail gas pretreated in the S2 and S3 steps, introducing the mixture into a secondary alkali liquor absorption tower for treatment, and introducing the treated mixture into a spray tower to ensure that the waste gas is fully contacted with the atomized water drops sprayed in the tower to absorb the residual pollution factors in the waste gas;
and T2, conveying the waste gas discharged from the spray tower to a high exhaust funnel through a pipeline for discharging.
Further, the step S1 is to perform the following purification processes: the collected waste gas is firstly adsorbed by a packed tower filled with active carbon, and then the treated waste gas is dedusted by a belt type deduster, so that the purified waste gas is obtained.
Further, the electrolysis site in step S1 is a hydrochloric acid electrolysis bath.
Furthermore, a water washing section is arranged at the upper part of the secondary alkali liquor absorption tower to remove alkali liquor carried by waste gas.
Further, the height of the high exhaust funnel in the step T2 is greater than 21 m.
The invention has the beneficial effects that:
the invention firstly pretreats the waste gas generated by different production parts respectively, treats different types of waste gas according to local conditions, concentrates the pretreated waste gas for uniform secondary treatment and finally discharges the waste gas uniformly. During pretreatment, a large amount of HCL and chlorine gas are generated in the chlorine reaction, and if the chlorine gas is absorbed by alkali liquor, a large amount of alkali liquor is consumed, so that the cost is increased, HCL gas generated after chlorination reaction and excessive chlorine gas are adsorbed by an activated carbon adsorption tower, dust is removed by a belt type dust remover, some impurity particles are removed, the chlorine gas with higher purity is obtained, the combustion reaction of the chlorine gas and hydrogen gas is promoted, concentrated hydrochloric acid is electrolyzed in a hydrochloric acid electrolytic tank, and the generated high-concentration chlorine gas and hydrogen gas respectively enter respective treatment units from a cathode stage and an anode stage, so that the chlorine gas and the hydrogen gas can be recycled infinitely, the waste gas is treated, the environment is protected, and the cost for treating the waste gas is saved; the invention adopts the structure that the water washing section is arranged at the upper part of the secondary alkali liquor absorption tower and is used for removing alkali liquor carried in waste gas and reducing unnecessary impurities.
Detailed Description
The technical solution of the present invention is further described in detail with reference to the following specific examples, but the scope of the present invention is not limited to the following.
Example 1
A method for treating 2,4-D waste gas comprises pretreatment and centralized treatment, wherein the pretreatment comprises the following steps:
s1, collecting HCL gas discharged by chlorination reaction and excessive chlorine, drying, adsorbing by a packed tower filled with activated carbon, dedusting the treated waste gas by a belt type deduster, combusting the purified waste gas and hydrogen to generate HCL gas, dissolving the HCL gas in water to form concentrated hydrochloric acid with the mass fraction of 26-32%, electrolyzing the obtained concentrated hydrochloric acid in a hydrochloric acid electrolytic tank after passing through a cooler and an activated carbon filter, and recovering high-concentration chlorine and hydrogen generated by electrolysis;
s2, collecting chlorine, HCL gas, toluene, dichlorophenol and trichlorophenol discharged by the system, absorbing the chlorine, HCL gas, toluene, dichlorophenol and trichlorophenol by using a three-stage water falling film, and treating the chlorine, HCL gas, toluene, dichlorophenol and trichlorophenol by using a two-stage alkali liquor absorption tower;
s3, collecting the triclosan, sodium chloride and HCl gas discharged by drying, and treating the collected gas by a secondary alkali liquor absorption tower;
the centralized processing comprises the following steps:
t1, mixing the tail gas pretreated in the S2 and S3 steps, introducing the mixture into a secondary alkali liquor absorption tower for treatment, and introducing the treated mixture into a spray tower to ensure that the waste gas is fully contacted with the atomized water drops sprayed in the tower to absorb the residual pollution factors in the waste gas;
and T2, conveying the waste gas discharged from the spray tower to a high exhaust funnel through a pipeline for discharging.
The step S1 includes: the collected waste gas is firstly adsorbed by a packed tower filled with active carbon, and then the treated waste gas is dedusted by a belt type deduster, so that the purified waste gas is obtained.
Specifically, the upper part of the secondary alkali liquor absorption tower is provided with a water washing section for removing alkali liquor carried by waste gas.
Specifically, the height of the high exhaust funnel in the step T2 is greater than 21 m.
Example 2
A method for treating 2,4-D waste gas comprises pretreatment and centralized treatment, wherein the pretreatment comprises the following steps:
s1, collecting HCL gas discharged by chlorination reaction and excessive chlorine, drying, adsorbing by a packed tower filled with activated carbon, dedusting the treated waste gas by a belt type deduster, combusting the purified waste gas and hydrogen to generate HCL gas, dissolving the HCL gas in water to form concentrated hydrochloric acid with the mass fraction of 26-32%, electrolyzing the obtained concentrated hydrochloric acid in a hydrochloric acid electrolytic tank after passing through a cooler and an activated carbon filter, and recovering high-concentration chlorine and hydrogen generated by electrolysis;
s2, collecting chlorine, HCL gas, toluene, dichlorophenol and trichlorophenol discharged by the system, absorbing the chlorine, HCL gas, toluene, dichlorophenol and trichlorophenol by using a three-stage water falling film, and treating the chlorine, HCL gas, toluene, dichlorophenol and trichlorophenol by using a two-stage alkali liquor absorption tower;
s3, collecting the triclosan, sodium chloride and HCl gas discharged by drying, and treating the collected gas by a secondary alkali liquor absorption tower;
the centralized processing comprises the following steps:
t1, mixing the tail gas pretreated in the S2 and S3 steps, introducing the mixture into a secondary alkali liquor absorption tower for treatment, and introducing the treated mixture into a spray tower to ensure that the waste gas is fully contacted with the atomized water drops sprayed in the tower to absorb the residual pollution factors in the waste gas;
and T2, conveying the waste gas discharged from the spray tower to a high exhaust funnel through a pipeline for discharging.
The step S1 includes: the collected waste gas is firstly adsorbed by a packed tower filled with active carbon, and then the treated waste gas is dedusted by a belt type deduster, so that the purified waste gas is obtained.
Specifically, the upper part of the secondary alkali liquor absorption tower is provided with a water washing section for removing alkali liquor carried by waste gas.
Specifically, the height of the high exhaust funnel in the step T2 is greater than 21 m.
Example 3
A method for treating 2,4-D waste gas comprises pretreatment and centralized treatment, wherein the pretreatment comprises the following steps:
s1, collecting HCL gas discharged by chlorination reaction and excessive chlorine, drying, adsorbing by a packed tower filled with activated carbon, dedusting the treated waste gas by a belt type deduster, combusting the purified waste gas and hydrogen to generate HCL gas, dissolving the HCL gas in water to form concentrated hydrochloric acid with the mass fraction of 26-32%, electrolyzing the obtained concentrated hydrochloric acid in a hydrochloric acid electrolytic tank after passing through a cooler and an activated carbon filter, and recovering high-concentration chlorine and hydrogen generated by electrolysis;
s2, collecting chlorine, HCL gas, toluene, dichlorophenol and trichlorophenol discharged by the system, absorbing the chlorine, HCL gas, toluene, dichlorophenol and trichlorophenol by using a three-stage water falling film, and treating the chlorine, HCL gas, toluene, dichlorophenol and trichlorophenol by using a two-stage alkali liquor absorption tower;
s3, collecting the triclosan, sodium chloride and HCl gas discharged by drying, and treating the collected gas by a secondary alkali liquor absorption tower;
the centralized processing comprises the following steps:
t1, mixing the tail gas pretreated in the S2 and S3 steps, introducing the mixture into a secondary alkali liquor absorption tower for treatment, and introducing the treated mixture into a spray tower to ensure that the waste gas is fully contacted with the atomized water drops sprayed in the tower to absorb the residual pollution factors in the waste gas;
and T2, conveying the waste gas discharged from the spray tower to a high exhaust funnel through a pipeline for discharging.
The step S1 includes: the collected waste gas is firstly adsorbed by a packed tower filled with active carbon, and then the treated waste gas is dedusted by a belt type deduster, so that the purified waste gas is obtained.
Specifically, the upper part of the secondary alkali liquor absorption tower is provided with a water washing section for removing alkali liquor carried by waste gas.
Specifically, the height of the high exhaust funnel in the step T2 is greater than 21 m.
By monitoring the composition of the exhaust gas discharged from examples 1 to 3, the results are shown in table 1 below:
the monitoring method of the exhaust gas components comprises the following steps: GB16297-1996 Integrated emission Standard for air pollutants
Item Example 1 Example 2 Example 3
Hydrogen chloride (mg/m)3) 21.8 21.4 22.1
Chlorine gas (mg/m)3) 0.42 0.37 0.39
Toluene (mg/m)3) 0.075 0.071 0.072
Phenols (mg/m)3) 24.2 23.4 23.6
TABLE 1
The above table 1 shows that the detection results of example 2 are the most optimal examples.
The foregoing is illustrative of the preferred embodiments of this invention, and it is to be understood that the invention is not limited to the precise form disclosed herein and that various other combinations, modifications, and environments may be resorted to, falling within the scope of the concept as disclosed herein, either as described above or as apparent to those skilled in the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (5)

1. A method for treating 2,4-D waste gas is characterized by comprising pretreatment and centralized treatment, wherein the pretreatment comprises the following steps:
s1, collecting HCL gas discharged by chlorination reaction and excessive chlorine, drying and purifying the HCL gas, and combusting the HCL gas and hydrogen to generate HCL gas, wherein the HCL gas is dissolved in water to form concentrated hydrochloric acid with the mass fraction of 26-32%, the obtained concentrated hydrochloric acid is electrolyzed after passing through a cooler and an active carbon filter, and high-concentration chlorine and hydrogen generated by electrolysis are recovered;
s2, collecting chlorine, HCL gas, toluene, dichlorophenol and trichlorophenol discharged by the system, absorbing the chlorine, HCL gas, toluene, dichlorophenol and trichlorophenol by using a three-stage water falling film, and treating the chlorine, HCL gas, toluene, dichlorophenol and trichlorophenol by using a two-stage alkali liquor absorption tower;
s3, collecting the triclosan, sodium chloride and HCl gas discharged by drying, and treating the collected gas by a secondary alkali liquor absorption tower;
the centralized processing comprises the following steps:
t1, mixing the tail gas pretreated in the S2 and S3 steps, introducing the mixture into a secondary alkali liquor absorption tower for treatment, and introducing the treated mixture into a spray tower to ensure that the waste gas is fully contacted with the atomized water drops sprayed in the tower to absorb the residual pollution factors in the waste gas;
and T2, conveying the waste gas discharged from the spray tower to a high exhaust funnel through a pipeline for discharging.
2. The method for treating 2,4-D waste gas according to claim 1, wherein the step S1 is a purification treatment comprising: the collected waste gas is firstly adsorbed by a packed tower filled with active carbon, and then the treated waste gas is dedusted by a belt type deduster, so that the purified waste gas is obtained.
3. The method for treating 2,4-D waste gas according to claim 1, wherein the electrolysis site in step S1 is a hydrochloric acid electrolyzer.
4. The method for treating 2,4-D waste gas according to claim 3, wherein the upper part of the secondary lye absorption tower is provided with a water washing section for removing lye carried by the waste gas.
5. A method as claimed in claim 3, wherein said step T2 is performed by using a high exhaust funnel with a height greater than 21 m.
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CN109503331B (en) * 2019-01-23 2021-11-30 淮南师范学院 Method for preparing high-purity hydrogen chloride gas from 2, 4-dichlorophenol byproduct
CN111995518B (en) * 2020-09-11 2023-04-07 三峡大学 Method for producing chlorinated fatty acid methyl ester by resource utilization of byproduct hydrochloric acid

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0001145A1 (en) * 1977-09-05 1979-03-21 SOLVAY & Cie (Société Anonyme) Method for the selective recovery of chlorine and carbon dioxide from a gas mixture
CN103111166A (en) * 2013-03-08 2013-05-22 山东科源化工有限公司 Method for treating 2, 4-D waste gas
CN107540578A (en) * 2016-06-27 2018-01-05 宁夏海诚电化信息科技有限公司 A kind of adjacent trifluoromethoxy benzenesulfonyl isocyanate production technology

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0001145A1 (en) * 1977-09-05 1979-03-21 SOLVAY & Cie (Société Anonyme) Method for the selective recovery of chlorine and carbon dioxide from a gas mixture
CN103111166A (en) * 2013-03-08 2013-05-22 山东科源化工有限公司 Method for treating 2, 4-D waste gas
CN107540578A (en) * 2016-06-27 2018-01-05 宁夏海诚电化信息科技有限公司 A kind of adjacent trifluoromethoxy benzenesulfonyl isocyanate production technology

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