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Method for extracting pyrethrin by continuous countercurrent ultra audible sound

A pyrethrin, countercurrent ultrasonic technology, applied in the fields of botanical equipment and methods, animal repellents, biocides, etc., can solve the problems of small processing capacity, difficult processing, high investment cost, and achieve large processing capacity and solvent recovery rate. High and small investment in equipment

Inactive Publication Date: 2010-02-24
红河森菊生物有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the strong penetration of carbon dioxide in the supercritical state, impurities such as waxes, fatty acids, and tannins in pyrethrum pollen are extracted at the same time, which brings difficulties to subsequent processing.
However, the low-temperature extraction of pyrethrins with carbon dioxide has a high extraction rate, but the investment cost is high and the processing capacity is small.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Crush the pyrethrum flowers to 20 meshes, and send the pyrethrum pollen to the material inlet of the ultrasonic extractor with a screw conveyor at normal temperature and pressure. Under the propulsion of the spiral stirring, the pyrethrum pollen forms convection with the solvent petroleum ether injected into the tail. Fully mix and extract, and about 10% of the solvent enters the ultrasonic extractor in sections (the ultrasonic extractor itself is divided into several sections) for stirring and mixing. The mass ratio of pyrethrum pollen and solvent is 1:4, and the ultrasonic frequency is 23.5-28.5 kHz, extraction time 45 minutes. The extracted solution is filtered and concentrated at low temperature to recover the solvent; the extracted residue is recovered by filtration and evaporation. The recovered solvent is reused.

Embodiment 2

[0011] Crush the pyrethrum flowers to 60 mesh, and send the pyrethrum pollen to the material inlet of the ultrasonic extractor with a screw conveyor at normal temperature and pressure. Under the propulsion of the spiral stirring, the pyrethrum pollen forms a convection with the solvent methanol injected into the tail for full extraction. Mixed extraction, and about 10% of the solvent enters the ultrasonic extraction machine in sections (the ultrasonic extraction machine itself is divided into several sections) for stirring and mixing. The mass ratio of pyrethrum pollen to solvent is 1:6, and the frequency of ultrasonic waves is 23.5-28.5kHz , The extraction time is 35 minutes. The extracted solution is filtered and concentrated at low temperature to recover the solvent; the extracted residue is recovered by filtration and evaporation. The recovered solvent is reused.

Embodiment 3

[0013] Crush the pyrethrum flowers to 100 mesh, and send the pyrethrum pollen to the material inlet of the ultrasonic extractor with a screw conveyor at normal temperature and pressure. Under the propulsion of the spiral stirring, the pyrethrum pollen forms a convection flow with the solvent n-hexane injected into the tail. Fully mix and extract, and about 10% of the solvent enters the ultrasonic extractor in sections (the ultrasonic extractor itself is divided into several sections) for stirring and mixing. The mass ratio of pyrethrum pollen to solvent is 1:8, and the frequency of ultrasonic waves is 23.5-28.5 kHz, extraction time 25 minutes. The extracted solution is filtered and concentrated at low temperature to recover the solvent; the extracted residue is recovered by filtration and evaporation. The recovered solvent is reused.

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PUM

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Abstract

The invention relates to a method for extracting pyrethrin by continuous countercurrent formed by materiel and solvent under the reinforcement condition of ultra audible sound. Pulvis flores pyrethriis loaded into a material inlet of an ultraphonic extracting machine (tube) by a worm distributor after pyrethrum flower is crashed into 20 to 100 meshes, and forms the countercurrent with the solventinputted from the end part under the push of spiral agitation for thorough mixing extraction. The other part of the solvent (10%) sectionally enters the ultraphonic extracting machine (tube) to be agitated and mixed. The pulvis flores pyrethri and the solvent are in a certain scale, and the extraction time is from 25 to 50 minutes. The method has high handling capacity for the pulvis flores pyrethri, continuous service, few impurities in the extracted materiel and higher percent recovery of the solvent, and is helpful for the stabilization of the pyrethrin.

Description

technical field [0001] The invention relates to a method for extracting pyrethrins, in particular to a method for continuous countercurrent ultrasonic extraction of pyrethrins. Background technique [0002] The current production techniques for extracting pyrethrins include solvent extraction, supercritical fluid extraction, and carbon dioxide low-temperature extraction of pyrethrins. Petroleum ether, methanol, n-hexane, etc. are used as the extraction solvent. Due to the high price of the solvent, and the low yield of solvent extraction, 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 researched on carbon dioxide supercritical extraction and applied for a patent. After years of experimentation and exploration, the extraction rate of pyrethrins has increased by 20-30% compared with n-hexane extraction, and the extraction rate has i...

Claims

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Application Information

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IPC IPC(8): A01N65/12
Inventor 马红勇唐国平王维维
Owner 红河森菊生物有限责任公司