Production method for extracting pyrethrin from pyrethrum flower

A technology of pyrethrum and pyrethrin, which is applied in the field of pyrethrin preparation, can solve the problems of low product activity, high solvent consumption, and high production cost, and achieve huge economic and social benefits, no environmental pollution, and low production cost.

Active Publication Date: 2013-07-17
安徽嘉旗粮油工程技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the production method of extracting pyrethrins from pyrethrum flowers basically uses subcritical liquid butane solvent extraction, and a few also use supercritical CO 2 Extraction, but the disadvantages of these two production processes are high equipment pressure and large equipment investment; small output, intermittent production, and cannot achieve large-scale and continuous production; high solvent consumption and high production costs
[0004] CN102342304A discloses a production method for extracting pyrethrins from pyrethrum. This method uses n-hexane as a solvent extraction production process, but it still has disadvantages: (1) Large solvent ratio and large energy consumption: the solid-liquid ratio is 1:7 ~8, so there are more solvents that n

Method used

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  • Production method for extracting pyrethrin from pyrethrum flower

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Experimental program
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Effect test

Embodiment 1

[0047] (a) Drying, crushing and breaking the pyrethrum flowers through the flow: send the pyrethrum flowers into the through-flow belt type continuous dryer, hot air and cold air alternately pass through the pyrethrum flower material layer, the temperature of the hot air is 65 ° C, and the temperature of the cold air is 28°C, temperature of pyrethrum flowers is 42°C; grind the receptacles and pistils of the dried pyrethrum flowers into 10-20 mesh powders with a pulverizer; roll the pyrethrum powder into 0.3-0.5mm thick Embryo sheet;

[0048] (b) Multi-stage countercurrent pulse extraction: Pyrethrum flower embryo slices are transported to the extractor by a material sealing conveyor, and at 50°C, firstly, they are sprayed, soaked and extracted by n-hexane extraction solvent containing pyrethrins with a mass concentration of 2.0%, and then drained. dry, and then successively seven-stage spraying, soaking, and draining of extraction solvents containing pyrethrins with a mass con...

Embodiment 2

[0053] (a) Drying, crushing and breaking the pyrethrum flowers through the flow: send the pyrethrum flowers into the through-flow belt type continuous dryer, hot air and cold air alternately pass through the pyrethrum flower material layer, the temperature of the hot air is 70°C, and the temperature of the cold air is 30°C, the temperature of pyrethrum flowers is 45°C; the receptacles and stamens of the dried pyrethrum flowers are crushed into 10-20 mesh powders with a pulverizer; Embryo sheet;

[0054] (b) Multi-stage countercurrent pulse extraction: Pyrethrum flower embryos are transported to the extractor by the sealing conveyor, and at 45-50°C, they are first sprayed and soaked by n-hexane extraction solvent containing pyrethrins with a mass concentration of 1.5%. , drained, and then successively seven-stage spraying, soaking, and draining of extraction solvents containing pyrethrins with a mass concentration of 1.2%, 1.0%, 0.8%, 0.5%, 0.2%, and 0.1%, and repeated cycle ex...

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PUM

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Abstract

The invention relates to a production method for extracting pyrethrin from a pyrethrum flower. The production process comprises the following steps of: (a) carrying out draining drying, smashing and wall breaking on the pyrethrum flower; (b) carrying out multistage reflux pulse extraction; (c) carrying out reflux film evaporation at negative pressure; (d) adsorbing, filtering and separating at negative pressure; and (e) rectifying and purifying at negative pressure. The production method disclosed by the invention greatly increases the yield of the pyrethrin, realizes the large-scale, industrialized and continuous production of the pyrethrin and has the advantages of no environmental pollution, low production cost and enormous economic benefit and social benefit.

Description

technical field [0001] The invention relates to a preparation method of pyrethrins, in particular to a production method of extracting pyrethrins from pyrethrum flowers. Background technique [0002] Pyrethrins are a class of broad-spectrum insecticides that can control a variety of pests, and their insecticidal toxicity is 10-100 times higher than that of older generation insecticides such as organochlorines, organophosphorus, and carbamates. Pyrethroids have a strong contact effect on insects, and some species have stomach poisoning or fumigating effects, but none of them have systemic effects. Its mechanism of action is to disrupt the normal physiology of insect nerves, causing them to die from excitement, convulsions, and paralysis. Pyrethroids are safe for humans and animals because of their small dosage and low concentration, and they have little pollution to the environment. [0003] Pyrethrum flowers are a major source of pyrethrins. At present, the production met...

Claims

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Application Information

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IPC IPC(8): C07C69/747C07C67/48A01N65/12A01P7/04
Inventor 王晓平
Owner 安徽嘉旗粮油工程技术有限公司
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