Low temperature CO2 pyrethrin extracting process

A carbon dioxide and pyrethrin technology, applied in the fields of botanical equipment and methods, animal repellents, biocides, etc., can solve problems such as processing difficulties, and achieve the effects of improving extraction efficiency, reducing production costs, and reducing impurities

Inactive Publication Date: 2003-06-04
YUNNAN CHUANGSEN IND CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, due to the strong penetration of carbon dioxide in the supercritical state, impurities such as waxes, tannins, and fatty acids in pyrethrum pollen are extracted at the same time, which brings difficulties to subsequent processing.

Method used

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  • Low temperature CO2 pyrethrin extracting process

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Embodiment Construction

[0009] specific implementation plan

[0010] Crush pyrethrum flowers to 20-100 meshes, 20 meshes account for 20%, 40 meshes account for 30%, 60 meshes account for 30%, 80 meshes account for 20%, weigh 251-320 kg and put them into the extraction tank, add a total of 6- 12 tons of carbon dioxide liquid extraction for 2 hours, the temperature is 5-20°C, the extraction pressure is 5-15MPa, then the pressure is reduced to 3-13MPa, and the temperature is raised to 5-40°C for secondary analysis of pyrethrins, and carbon dioxide is recovered for reuse.

[0011] Loading quantity

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Abstract

The low temperature CO2 pyrethrin extracting process includes crushing pyrethrum to 20-100 mesh, extraction in CO2 liquid for 1.5-2.5 hr first at 0-25 deg.c and 5-15 MPa and then at 5-40 deg.c and 3-13 MPa, and recovering CO2 for reuse. The process of the present invention has high extractive purity, low production cost and high extraction efficiency in despite of its total yield lower than that of supercritical extraction process.

Description

technical field [0001] The invention relates to a method for extracting pyrethrins, in particular to a method for extracting pyrethrins at low temperature with carbon dioxide. Background technique [0002] At present, the production techniques for extracting pyrethrins are mainly solvent extraction and supercritical fluid extraction. The extraction solvent adopts n-hexane and petroleum ether. Due to the high price of the solvent, the production cost is high, and the solvent extraction yield is low and the color is poor. Therefore, Germany, Australia and other countries use supercritical extraction technology for the production of pyrethrins. At the same time, the Kunming Institute of Botany has started research on carbon dioxide supercritical extraction of pyrethrum and applied for a patent. After years of experiments, the extraction rate of pyrethrins has increased by 20-30% compared with n-hexane extraction, and the extraction rate has increased by 0.2-0.3%. However, due...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01N53/00
Inventor 王怀勇
Owner YUNNAN CHUANGSEN IND CO LTD
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