Supercharge Your Innovation With Domain-Expert AI Agents!

Preparation method of phenoxyacetic acid

A technology of phenoxyacetic acid and chloroacetic acid, which is applied in the preparation of carboxylate, the preparation of organic compounds, chemical instruments and methods, etc., can solve the problems of high production cost and low overall yield, so as to solve the problem of processing and improve the yield. rate effect

Pending Publication Date: 2020-07-24
姜林
View PDF4 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of low overall yield and high production cost in the existing phenoxyacetic acid preparation methods, the invention provides a preparation method of phenoxyacetic acid

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
  • Preparation method of phenoxyacetic acid

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0024] see figure 1 As shown, the embodiment of the present invention provides a kind of preparation method of phenoxyacetic acid, comprises the following operation steps:

[0025] Condensation reaction: mixing reaction raw materials including chloroacetic acid, phenol and alkali for condensation reaction to obtain reaction mother liquor;

[0026] Acidification and crystallization: Acidification and crystallization of the reaction mother liquor, separation of phenoxyacetic acid crystals and crystallization mother liquor;

[0027] Resin adsorption treatment: Adsorption resin is used to absorb the organic matter in the crystallization mother liquor, and the permeate contains inorganic salts;

[0028] Analyzing the dope: use lye to analyze the adsorption resin, and the obtained analytic dope is used as the reaction raw material for the condensation reaction.

[0029] According to the preparation method of phenoxyacetic acid provided by the present invention, the crystallization...

Embodiment 1

[0051] This embodiment is used to illustrate the preparation method of the phenoxyacetic acid disclosed in the present invention, comprising the following steps:

[0052] a. Material preparation: Add solid chloroacetic acid with a content of not less than 96% in the material preparation tank A, dissolve it in hot water at 50-60°C to a concentration of 50%, add solid alkali according to the molar ratio of chloroacetic acid:NaOH 1:1, and stir After 15 minutes, vinyl chloride material was obtained, which was kept warm for subsequent use. Add phenol with a content of not less than 98% in the material preparation tank B, replace the air with nitrogen, preheat the phenol to 70°C, add 30% (mass content) sodium hydroxide lye and analytical concentrated solution preheated to 75°C After stirring for 15 minutes, the phenol material was obtained, and the preparation was completed and kept warm. The molar ratio of phenol to sodium hydroxide was 1:1.05.

[0053] b. Condensation reaction: ...

Embodiment 2

[0058] This embodiment is used to illustrate the preparation method of the phenoxyacetic acid disclosed in the present invention, comprising the following steps:

[0059] a. Material preparation: Add solid chloroacetic acid with a content of not less than 96% in the material preparation tank A, and dissolve it with 50-60°C hot water (or material) to a concentration of 50%, according to the molar ratio of chloroacetic acid: liquid ammonia 1 : 1 was added, and after the addition was completed, the vinyl chloride material was obtained after stirring for 30 minutes, which was kept warm for subsequent use. Add phenol with a content of not less than 98% in the material preparation tank B, replace the air with nitrogen, preheat the phenol to 70°C, add potassium hydroxide lye preheated to 75°C and mix to achieve the content of phenol in the concentrated solution Equivalent, add pre-heated to 75 ℃ analytical concentrate. After stirring for 15 minutes, the phenol material was obtained,...

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

PropertyMeasurementUnit
melting pointaaaaaaaaaa
boiling pointaaaaaaaaaa
Login to View More

Abstract

In order to solve the problems of low total yield and high production cost in the existing phenoxyacetic acid preparation method, the invention provides a preparation method of phenoxyacetic acid, which comprises the following operation steps: carrying out condensation reaction, namely, mixing reaction raw materials comprising chloroacetic acid, phenol and alkali, and carrying out condensation reaction to obtain a reaction mother liquor; acidifying and crystallizing, namely, acidifying and crystallizing the reaction mother liquor, and separating to obtain phenoxyacetic acid crystals and a crystallization mother liquor; carrying out resin adsorption treatment, namely, adsorbing organic matters in the crystallization mother liquor by adopting adsorption resin, wherein permeate liquid contains inorganic salt; and desorbing the concentrated solution, namely desorbing the adsorption resin by adopting alkali liquor, wherein the obtained desorbed concentrated solution is used as a reaction raw material for condensation reaction. The preparation method of phenoxyacetic acid provided by the invention can effectively improve the yield of phenoxyacetic acid and reduce the wastewater treatmentcost.

Description

technical field [0001] The invention belongs to the technical field of chemical product preparation, and in particular relates to a preparation method of phenoxyacetic acid. Background technique [0002] Phenoxyacetic acid, white needle-like crystals, melting point 98-99 ° C, boiling point 285 ° C, slightly soluble in water, widely used in the production of plant growth hormone and 2.4-dichlorophenoxyacetic acid herbicide (also known as 2.4-D acid ), and phenoxyacetic acid series products are widely used in the pharmaceutical and dye industries. In the synthetic pharmaceutical industry, there are only a dozen kinds of lipid-lowering drugs in the phenoxyacetic acid series. The raw materials of phenoxyacetic acid used in the pesticide and pharmaceutical industries require high quality, especially the free phenol content is required to be below 5mg / kg, and the main content must reach more than 99%. The domestic demand is tens of thousands of tons per year. Production by tradit...

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): C07C51/367C07C51/42C07C59/60
CPCC07C51/367C07C51/42C07C59/60
Inventor 姜林刘长飞
Owner 姜林
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

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

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com