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
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[0022] Accurately weigh the first racemic (±) chrysanthemic acid, melt it completely at 60°C, stir and crystallize slowly at the corresponding crystallization temperature for 2 to 7 hours, and keep warm and filter, then heat up the jacket of the filter tank to make the crystal sweat, and put it while it is hot The liquid is extruded, the temperature is lowered and the crystal is transferred to obtain the first chrysanthemic acid rich in trans with a high cis-to-trans ratio, and the filtrate can be further melted and crystallized.
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