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Treatment method and system for organic exhaust gas generated from chlorination reaction

A technology of organic waste gas and chlorination reaction, applied in gas treatment, chemical instruments and methods, gaseous effluent wastewater treatment, etc., can solve problems such as pollution, high cost of lye absorption, and a large amount of high-concentration wastewater

Pending Publication Date: 2017-11-07
ZHEJIANG QICAI ECO TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above waste gas treatment device has treated the industrial waste gas containing chlorine gas and hydrogen chloride gas to make the discharged gas meet the standard, if the discharge liquid is not treated, there will still be pollution problems
[0005] The cost of simple lye absorption is high, and a large amount of high-concentration wastewater containing organic matter is produced, causing secondary pollution

Method used

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  • Treatment method and system for organic exhaust gas generated from chlorination reaction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] The 5-chloro-2-aminobenzoic acid used in the synthesis of the important intermediate 2-chloro-3-amino-4-picoline of the anticancer drug nevirapine (nevirapine) is made of aminobenzoic acid as raw material through chlorine gas Chlorinated synthetically.

[0070] A plant of aminobenzoic acid produced a large amount of waste gas containing chlorine, hydrogen chloride, aminobenzoic acid, and chloroaminobenzoic acid through a high-temperature chlorination process. The content of each substance is about: chlorine gas 34000mg / m 3 , hydrogen chloride 56000mg / m 3 , organic matter 8000mg / m 3 . The above waste gas is 500m 3 The flow rate of / h enters the condenser, and the condensation temperature is -5°C;

[0071] The condensed exhaust gas enters the water washing tower, and is absorbed countercurrently with clean water from the top of the tower, and the spray density is 40m 3 / (m 2 h), the waste gas residence time is 5s, and the absorption temperature is 35°C; the chlorin...

Embodiment 2

[0081] 2,6-Dichlorobenzonitrile is an intermediate of various herbicides and insecticides. The intermediate of a 2,6-dichlorobenzonitrile project in a factory produced a large amount of waste gas containing chlorine, hydrogen chloride, and chlorobenzene through the chlorination process. . The content of each substance is about: chlorine gas 12000mg / m 3 , hydrogen chloride 2000mg / m 3 , organic matter 1000mg / m 3 .

[0082] Exhaust gas at 500m 3 The flow rate of / h enters the condenser, and the condensation temperature is -10°C; the washing liquid contains hydrochloric acid, and the hydrochloric acid can be recovered when the hydrochloric acid in the washing liquid reaches 12%;

[0083] The condensed exhaust gas enters the water washing tower, and is absorbed in parallel flow with clean water from the top of the tower, with a spray density of 42m 3 / (m 2 h), the waste gas residence time is 8s, the absorption temperature is 35°C; the chlorine content after absorption is abou...

Embodiment 3

[0091] As an important chemical raw material, p-chlorobenzaldehyde, a dye intermediate, is usually produced by chlorination and hydrolysis of p-chlorotoluene.

[0092] A factory of p-chlorobenzaldehyde produced a large amount of waste gas containing chlorine, hydrogen chloride, chlorobenzene, and benzyl chloride through the chlorination process. The content of each substance is about: chlorine gas 22000mg / m 3 , hydrogen chloride 16000mg / m 3 , organic matter 6000mg / m 3 .

[0093] Exhaust gas at 500m 3 The flow rate of / h enters the condenser, and the condensation temperature is -7°C;

[0094] The washing liquid contains hydrochloric acid, and the hydrochloric acid can be recovered when the hydrochloric acid in the washing liquid reaches 14%;

[0095] The condensed exhaust gas enters the water washing tower, and is absorbed in parallel flow with clean water from the top of the tower, and the spray density is 35m 3 / (m 2 h), the waste gas residence time is 6s, the absorption...

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Abstract

The invention discloses a treatment method and system for an organic exhaust gas generated from a chlorination reaction. The treatment method includes: cooling the organic exhaust gas generated from a chlorination reaction through a condenser; leading the cooled exhaust gas in from the top of a washing tower and spraying and washing the exhaust gas to obtain washed discharged water and washed exhaust gas; leading the washed exhaust gas in from the bottom of an alkaline washing tower for spraying and alkaline washing to obtain alkaline-washed discharged water and alkaline-washed exhaust gas; leading the alkaline-washed exhaust gas in from the middle part of a catalytic oxidation tower, performing spraying and washing, spraying the alkaline-washed discharged water from the top of the catalytic oxidation tower to obtain washed discharged water and treated gas; and allowing the washed discharged water to fall on a catalyst bed layer for oxidation degradation. According to the treatment method, organic matters in an organic exhaust gas generated from a chlorination reaction can be well removed, useful substances in the exhaust gas can be fully used, the object of treating waste with other waste is achieved, and no secondary pollution is caused.

Description

technical field [0001] The invention relates to the technical field of waste gas treatment, in particular to a treatment method and system for chlorination reaction organic waste gas. Background technique [0002] Chlorination reaction is widely used to produce important chemical products in pharmaceutical chemical, pesticide chemical, fine chemical and petrochemical industries, and a large amount of organic waste gases (VOCs) containing chlorine gas and hydrogen chloride will be generated during the production process. These waste gases are more difficult to deal with than ordinary volatile organic compounds, and are more harmful. On the one hand, there are many kinds of substances in this type of organic waste gas and their components are complex; Higher requirements on equipment materials. [0003] At present, the waste gas containing chlorine and hydrogen chloride is often purified by wet lye neutralization absorption method. The lye absorption method is currently the m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/00B01D53/14B01D53/18B01D53/73B01D53/78B01D53/86B01D53/02C02F1/00C02F103/18C02F101/30
CPCB01D53/002B01D53/02B01D53/1406B01D53/1456B01D53/1487B01D53/18B01D53/73B01D53/78B01D53/86C02F1/00C02F2101/30C02F2103/18B01D2257/708B01D2257/2045B01D2257/2025
Inventor 毛兵陈磊吴勇前成一波李翔王培城蒋云峰
Owner ZHEJIANG QICAI ECO TECH CO LTD
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