Leaching and refining process for pyrethrum dry flower

A technology for pyrethrum and dried flowers, which is applied in the field of plant extraction, can solve the problems of low flash point of pyrethrin essential oil, high equipment cost, large solvent loss, etc., and achieves the effects of good pyrethrin quality, reduced production cost and easy operation.

Inactive Publication Date: 2006-08-23
红河森菊生物有限责任公司
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AI Technical Summary

Problems solved by technology

Wherein each kind of method of producing pyrethrins all has certain shortcoming, common shortcoming is that the refinement of pyrethrum extract all uses solvent treatment, and the flash point of gained pyrethrin essential oil is low, brings certain difficulty to transportation, increases transportation cost
The solvent extraction method extracts pyrethrum, the loss of solvent is large, the single batch processing time is long, the recovery rate of pyrethrin is low, and the waste of pyrethrum is large; the subcritical extraction method extracts pyrethrum, although the recovery rate of pyrethrin is improved, the single batch processing time is somewhat Shorten, but the processing quantity is limited and the batch processing time is longer; CO 2 Pyrethrins are extracted by supercritical extraction, and the time for single-batch processing of pyrethrum is short, but the quantity of single-batch processing of pyrethrum is small, and the cost of one-time investment in equipment is high

Method used

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Examples

Experimental program
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Effect test

Embodiment

[0007] Crush the dried pyrethrum flowers to 40-80 meshes, put the crushed dried pyrethrum flowers into an extraction container with microwave (ultrasonic wave) (the container is equipped with a stirrer and a two-way temperature adjustment device for lifting and lowering, and the pressure resistance is medium and low pressure), and add 4 ~8 times the dry flower weight of n-butane or hexane or petroleum ether or gasoline or water or methanol and other solvents, emit microwaves (ultrasonic waves) to the solvent in intervals, and stir in intervals, under medium and low pressure (within 2.5 MPa) conditions Pyrethrum is extracted twice, the cumulative extraction times are 2 to 4 times, each extraction is 2 to 60 minutes, and the cumulative extraction time is 10 to 120 minutes, then filtered, combined extracts, concentrated extracts under reduced pressure or heated, vaporized, compressed and recovered for extraction liquid to obtain the pyrethrum extract, and use n-butane or ethane to...

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Abstract

The dry pyrethrum flower leaching and product refining process includes crushing pyrethrum flower to 40-80 mesh; extracting crushed pyrethrum flower with solvent, such as butane, hexane, petroleum ether, etc. inside a extracting container with microwave unit under intermittent microwave action, intermittent stirring and medium or low pressure condition for 2-4 times of 10-120 altogether; filtering, merging filtrate, decompression concentrating to obtain pyrethrum extract while recovering solvent; supercritical separating the extract with butane or ethane to obtain refined avermectin oil. The present invention has low production cost, high avermectin recovering rate, high product quality and other advantages.

Description

technical field [0001] The invention relates to the technical field of plant extraction, in particular to the leaching and refining process of dried pyrethrum flowers. Background technique [0002] The existing pyrethrum dry flower processing technology is: first extract the pyrethrum dry flower with solvent, subcritical extraction and CO 2 Supercritical extraction, and then select a suitable solvent and refine the extract to obtain pyrethrin essential oil. Each of the methods for producing pyrethrins has certain disadvantages. The common disadvantage is that the refining of pyrethrum extracts is treated with solvents, and the obtained pyrethrin essential oil has a low flash point, which brings certain difficulties to transportation and increases transportation costs. The solvent extraction method extracts pyrethrum, the loss of solvent is large, the single batch processing time is long, the recovery rate of pyrethrin is low, and the waste of pyrethrum is large; the subcrit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C11B9/00
Inventor 王怀勇唐国平彭幸辉
Owner 红河森菊生物有限责任公司
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