Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Treatment method of chloroacetic acid by-product crystallization mother liquid

A technology of crystallization mother liquor and treatment method, which is applied in the separation/purification of carboxylic acid compounds, organic chemistry, etc., can solve the problems of difficult and high treatment cost of chloroacetic acid mother liquor, and achieve the effect of reducing equipment costs and energy consumption costs

Inactive Publication Date: 2017-04-05
SHANGHAI RES INST OF CHEM IND
View PDF3 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The treatment of chloroacetic acid mother liquor is difficult and costly. How to treat it so as to cause less environmental pollution and produce better economic benefits is a problem that domestic chloroacetic acid production enterprises need to solve

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
  • Treatment method of chloroacetic acid by-product crystallization mother liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] In Example 1, the partitioned rectification tower T1 is 8 meters high, the T2 tower is 22 meters high, and the T1 tower is filled with corrugated plates. The chloroacetic acid crystallization mother liquor raw material is added to the middle part of the partitioned rectification tower T1, and the feed rate is 500kg / h. After the raw material is heated and vaporized in the tower reactor, the steam enters the rectification tower upwards, and the liquid that refluxes with the top condenser in the tower Gas-liquid mass transfer is carried out on the packing surface, the top pressure of T1 tower is 1kPa, water, acetic acid and other low-boiling impurities D1 are extracted from the top of T1 tower, and the extraction rate is 80kg / h, and the material is discharged from the side line at 3m from the bottom of T1 tower The mixture Dm of monochloroacetic acid and dichloroacetic acid is extracted at one point, and the extraction rate is 370kg / h, and the high boiling point impurity W1...

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 invention relates to a treatment method of chloroacetic acid by-product crystallization mother liquid. The treatment method includes the steps of: (1) performing pressure reducing distillation to the crystallization mother liquid obtained from production of chloroacetic acid in a dividing wall rectifying column T1, withdrawing low boiling point impurities from the column top and high boiling point impurities from the column bottom, and withdrawing a monochloroacetic acid and dichloroacetic acid mixture from a side-withdrawing point in the middle of the column; (2) feeding the monochloroacetic acid and dichloroacetic acid mixture withdrawn from the side-withdrawing point of the dividing wall rectifying column T1 to a pressure reducing rectifying column T2 to perform pressure reducing rectification, and obtaining a high-purity monochloroacetic acid product on the top of the column and a high-purity dichloroacetic acid product in the bottom of the column. Compared with the prior art, the rectification is carried out with two sets of rectifying columns, so that effective separation of the chloroacetic acid crystallization mother liquid is achieved. The method greatly reduces equipment cost and energy consumption during separation and can continuously and stably produce the high-purity monochloroacetic acid and dichloroacetic acid products simultaneously. Purities of the products are both more than 99%.

Description

technical field [0001] The invention relates to a method for treating a by-product crystallization mother liquor of chloroacetic acid, in particular to a method for separating high-purity monochloroacetic acid and dichloroacetic acid from the chloroacetic acid crystallization mother liquor. Background technique [0002] Monochloroacetic acid is an important intermediate in organic synthesis, widely used in the fields of pesticides, medicines, dyes, daily chemicals, oil field chemicals, paper chemicals and organic synthesis, known as "industrial vitamins". With the advancement and development of technology, new application fields of chloroacetic acid will be gradually developed, and the production and market prospects of chloroacetic acid are very promising. At present, my country is already the world's largest producer and consumer of chloroacetic acid. [0003] Dichloroacetic acid is also an important basic organic chemical raw material, which is widely used in the product...

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): C07C51/44C07C53/16
CPCC07C51/44C07C53/16
Inventor 许保云翟金国艾波王传昌吴高胜江孝平包春凤
Owner SHANGHAI RES INST OF CHEM IND
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com