Method for manufacturing rich reverse type first chrysanthemic acid
A manufacturing method and technology of chrysanthemic acid, which is applied in the field of producing the first trans-rich chrysanthemic acid by melting crystallization method, can solve problems such as differences in insecticidal efficacy, and achieve the effects of low production cost, high yield and clean process
Active Publication Date: 2009-12-30
DALIAN CHEMPHY CHEM
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Abstract
The invention provides a method for manufacturing a rich reverse type first chrysanthemic acid. The method is characterized by comprising the following steps: using a racemization (+/-) first chrysanthemic acid with a purity of 93-99 percent and a forward inverse ratio between 3/97 and 20/80 as the material; crystallizing by means of melt crystallization at a temperature of 39.7-51 DEG C to obtain a rich reverse type first chrysanthemic acid with a forward inverse ratio of 1.5/98.5-9/91; and sweating, filtering and crystallizing the rich reverse type first chrysanthemic acid to obtain the rich reverse type first chrysanthemic acid with high purity, wherein the sweating temperature is 1-3 DEG C higher than the crystallizing temperature.
Application Domain
Organic compound preparationCarboxylic compound separation/purification
Technology Topic
ChemistryChrysanthemic acid +2
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