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Preparation method of phenoxypropionic acid

A technology of phenoxypropionic acid and seeds, which is applied in the field of synthesis and preparation of pesticide intermediates, can solve the problems of low total yield, harsh reaction conditions, high production cost, etc., and achieve less pollution, high yield, and few by-products Effect

Inactive Publication Date: 2016-08-24
JINING SCIENLEAD BIOTECH
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  • Summary
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Problems solved by technology

[0003] The existing R-4-hydroxyl-2-phenoxypropionic acid generally adopts the method of chemical synthesis, and the reaction process generates a large number of by-products, which are difficult to remove, seriously affecting the purification and yield of the target product; some methods have a long reaction time , and the total yield is low; there are also some methods that require the use of catalysts, harsh reaction conditions, high production costs, and are not suitable for industrial production

Method used

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Examples

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Embodiment 1

[0012] Take the strain of Pseudomonas-1, insert it into the wort medium, and shake the flask for 8-24 hours at a temperature of 37±1°C to prepare the seed liquid, and insert the cultivated seed liquid into the first-grade seeds The tank was cultivated for 24 hours, and then added to the secondary seed tank for 24 hours. The culture method was conventional yeast culture.

[0013] Take R-2-phenoxypropionic acid to prepare a 25-30% solution, insert 10% of the inoculum into the second-level seed liquid of Trichodina-1, aerobic fermentation at 35-38°C for 3-5 days, and then Add hydrochloric acid to acidify, adjust the pH value to 2.0-3.0, after the purity of R-4-hydroxy-2-phenoxypropionic acid detected by high performance liquid phase is greater than 90%, first filter with ceramic membrane, decolorize with activated carbon, and then filter with bag filter , Macroporous resin adsorption, ammonia desorption, 0.22μm organic membrane precision filtration, concentration and crystallizat...

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Abstract

The invention provides a preparation method of phenoxypropionic acid. The phenoxypropionic acid is prepared from R-2-phenoxypropionic acid through fermentation by virtue of candida-1. The preparation method disclosed by the invention is low in content of by-products and high in yield; and the purity of a finished product (the phenoxypropionic acid) can achieve 99.5% or above.

Description

technical field [0001] The invention relates to a preparation method of R-4-hydroxy-2-phenoxypropionic acid, belonging to the technical field of synthesis and preparation of pesticide intermediates. Background technique [0002] my country is a large agricultural country, and the amount of pesticides is very large. As an important component of the modern agricultural production system, herbicides are the most reliable and economical means of weeding technology in farmland. However, traditional herbicides are gradually being phased out due to their high toxicity, low efficiency, large dosage, and great impact on the environment. Therefore, modern pesticides put forward higher requirements for herbicides: high efficiency and low toxicity. In recent years, a series of herbicides such as diphenyl ethers and phenoxypropionic acids, sulfonylureas and imidazolinones, ureas containing pyridine rings, pyridazines, etc. have been developed successively. Phenoxypropionic acid compoun...

Claims

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Application Information

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IPC IPC(8): C12P7/52
CPCC12P7/42
Inventor 周伟何晔陈彦海周广坤
Owner JINING SCIENLEAD BIOTECH
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