Novel method for absorbing tail gas from trichloro-acetic chloride production through chlorination process

A technology for trichloroacetyl chloride and tail gas absorption, applied in chemical instruments and methods, separation methods, organic chemistry, etc. product and other issues

Inactive Publication Date: 2012-11-07
SHANXI SANWEI FENGHAI CHEM
View PDF1 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Novel method for absorbing tail gas from trichloro-acetic chloride production through chlorination process

Examples

Experimental program
Comparison scheme
Effect test

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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The present invention relates to a novel method for absorbing tail gas from trichloro-acetic chloride production through a chlorination process. The method can realize separation and recovery of hydrogen chloride, sulfur dioxide, sulfur, disulfur dichloride, and chlorine generated in the production process of trichloro-acetic chloride; the method is safe and easily controlled, has no harm to the environment, and generates by-products containing hydrochloric acid with concentration higher than 30% and a sodium bisulfite solution. The invention belongs to the technical field of environmental protection.

Description

technical field [0001] The invention relates to a new method for absorbing tail gas produced by a chlorination method to produce trichloroacetyl chloride, through which hydrogen chloride, sulfur dioxide, disulfur dichloride, chlorine gas, etc. generated during the production of trichloroacetyl chloride can be separated and recovered, and the side effects The hydrochloric acid and sodium bisulfite sodium solution of more than 30% can be produced, which 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 durin...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/75B01D53/68B01D53/50C07C53/48C07C51/60C01C1/22
Inventor 薛振海
Owner SHANXI SANWEI FENGHAI CHEM
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap