Absorption method of tail gas produced in production of trichloroacetyl chloride by means of chlorination process

A technology for trichloroacetyl chloride and tail gas absorption, which is applied to chemical instruments and methods, separation methods, chlorine/hydrogen chloride, etc., and can solve problems such as blockage of tubes, low product quality, and impact on the output of trichloroacetyl chloride

Pending Publication Date: 2015-12-16
山东谦诚工贸科技有限公司
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the treatment method of some production enterprises is to directly absorb the tail gas with liquid caustic soda to obtain high-salt wastewater, which is diluted with a large amount of clean water and then undergoes biochemical treatment. This will not only fail to effectively recover the by-products in the production process of trichloroacetyl chloride, and produce a lot of waste water
In order to reclaim the by-products in the production process of trichloroacetyl chloride, some enterprises only adopt the method of adding absorption tanks to reclaim the mixed acid chlorides and part of sulfur monochloride in the tail gas, and then absorb hydrogen chloride to produce hydrochloric acid through the three-stage membrane absorption tower, but Since the tail gas entering the membrane absorption tower also contains a certain amount of sulfur monochloride, after entering the membrane absorption tower, the tail gas containing sulfur monochloride will react with water to precipitate sulfur and gradually block the tubes in the absorption tower, sometimes When the situation is serious, the three-effect membrane absorption tower will be stopped for maintenance every other week or so, so that the production cannot be continued, which seriously affects the output of trichloroacetyl chloride; in addition, due to the removal of hydrogen chloride, a Sulfur chloride also contains sulfur dioxide and other gases, resulting in the production of hydrochloric acid is a mixed acid, the product quality is not high, can not be well applied

Method used

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  • Absorption method of tail gas produced in production of trichloroacetyl chloride by means of chlorination process

Examples

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Embodiment 1

[0016] The technological process of this embodiment sees figure 1 .

[0017] (1) The main and auxiliary chlorination reactors are connected in series, so that the positive and auxiliary tanks are cross-chlorinated, and the chlorine gas enters the main tank (or auxiliary tank) first, and the tail gas after the reaction includes chlorine, sulfur dioxide, sulfur dichloride, a Sulfur chloride, mixed acid chloride, hydrogen chloride, etc. enter the auxiliary tank (or main tank), and the chlorine and sulfur dichloride in the tail gas are absorbed by the auxiliary tank or participate in the reaction;

[0018] (2) The tail gas purified in step (1) includes sulfur dioxide, sulfur monochloride, mixed acid chloride, hydrogen chloride, etc., and the mixed acid chloride and part of the monochloride in the tail gas are absorbed by using the cooked mother liquor (that is, the solution of distilled water from the mother liquor of chloroacetic acid) Sulfur;

[0019] (3) After the tail gas pu...

Embodiment 2

[0024] The technological process of this embodiment sees figure 1 .

[0025] (1) The main and auxiliary chlorination reactors are connected in series, and the positive and auxiliary tanks are cross-chlorinated, and the chlorine gas enters the main tank (or auxiliary tank) first, and the tail gas after the reaction includes chlorine, sulfur dioxide, sulfur dichloride, Sulfur monochloride, mixed acid chloride, hydrogen chloride, etc. enter the auxiliary tank (or main tank), and the chlorine and sulfur dichloride in the tail gas are absorbed by the auxiliary tank or participate in the reaction;

[0026] (2) The tail gas purified in step (1) includes sulfur dioxide, sulfur monochloride, mixed acid chloride, hydrogen chloride, etc., and the mixed acid chloride and part of the monochloride in the tail gas are absorbed by using the cooked mother liquor (that is, the solution of distilled water from the mother liquor of chloroacetic acid) Sulfur;

[0027] (3) After the tail gas puri...

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Abstract

The invention relates to an absorption method of tail gas produced in production of trichloroacetyl chloride by means of chlorination process. By means of the method, separation and recycling of hydrogen chloride, sulfur dioxide, disulfur dichloride, chlorine and the like which are generated in the generation process of trichloroacetyl chloride can be achieved, the process is safe and easy to control, damage is not caused to the environment, and over 30% of hydrochloric acid and sodium bisulfite solutions are obtained as byproducts. The invention belongs to the technical field of environmental protection.

Description

technical field [0001] The invention relates to a tail gas absorption method for producing trichloroacetyl chloride by a chlorination method, through which hydrogen chloride, sulfur dioxide, disulfur dichloride, chlorine gas, etc. generated in the production process of trichloroacetyl chloride can be separated and recovered, and by-products Obtaining hydrochloric acid and sodium bisulfite sodium solution with more than 30% content belongs to the technical field of environmental protection. Background technique [0002] Trichloroacetyl chloride is an important intermediate in the production of clopyridinate sodium and chlorpyrifos. The preparation steps of the chlorination method are: (1) chloroacetic acid waste liquid (mother liquor) reacts with chlorine gas in the presence of sulfur to generate mixed acid chlorides; (2) mixes Acyl chloride reacts with chlorine gas in the presence of pyridine to form trichloroacetyl chloride. The tail gas produced during the chlorination pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/50B01D53/68B01D53/48C01B7/01C01D5/14
Inventor 袁加利刘洪昌
Owner 山东谦诚工贸科技有限公司
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