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Preparation method of refined natural pyrethrosin primary medicine

A technology of natural pyrethrins and pyrethrins, applied in the fields of botanical equipment and methods, biocides, plant growth regulators, etc., can solve the problems of affecting product quality, inconvenient production, time-consuming, etc., to solve the instability of light and heat , easy to operate, good appearance effect

Inactive Publication Date: 2005-01-19
红河森菊生物有限责任公司
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  • Application Information

AI Technical Summary

Problems solved by technology

In order to achieve this goal, the current method needs to be equipped with sedimentation tanks, filters, freezing devices, filters and other equipment to produce high-purity permethrin products, and the freezing process consumes electricity and time, which greatly brings inconvenience to production. And the pyrethrin produced will produce precipitation again after a certain period of time, affecting product quality

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The natural pyrethrum extract produced with carbon dioxide at low temperature is prepared in the following steps to refine the natural pyrethrin technical substance:

[0017] 1) Add solvent petroleum ether to the pyrethrum extract, the amount of petroleum ether is 8 times the weight of the pyrethrum extract, then add stabilizers BHA and BHT at 5‰ of the weight of the pyrethrum extract, and dissolve at a temperature of 40-60°C 1.5 hours;

[0018] 2) Filtrate at a temperature of 30-34°C to obtain a filtrate;

[0019] 3) Concentrate the filtrate at a temperature of 70-80°C and a vacuum of 0.4 to obtain a concentrated solution and recover the solvent;

[0020] 4) The concentrated solution adds 5% anhydrous sodium sulfate of pyrethrum extract weight:

[0021] 5) filter, reclaim sodium sulfate, obtain filtrate:

[0022] 6) Add petroleum ether until the pyrethrin content is 25% to obtain 25% natural pyrethrin technical product.

Embodiment 2

[0024] The natural pyrethrum extract produced with carbon dioxide at low temperature is prepared in the following steps to refine the natural pyrethrin technical substance:

[0025] 1) Add solvent petroleum ether to the pyrethrum extract, the amount of petroleum ether is 10 times the weight of the pyrethrum extract, then add 4‰ of the pyrethrum extract weight of stabilizer tannic acid, and dissolve 1 at 40-60 °C Hour;

[0026] 2) Filtrate at a temperature of 30-34°C to obtain a filtrate;

[0027] 3) Concentrate the filtrate at a temperature of 70-80°C and a vacuum of 0.6 to obtain a concentrated solution and recover the solvent;

[0028] 4) 9% anhydrous magnesium sulfate of pyrethrum extract weight is added to the concentrated solution;

[0029] 5) filter, reclaim magnesium sulfate, obtain filtrate;

[0030] 6) Add petroleum ether until the pyrethrin content is 50% to obtain 50% natural pyrethrin technical product.

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Abstract

A process for preparing raw pyrethrin includes such steps as adding petroleum ether to the extract of pyrethrum, adding stabilizer, dissolving at 40-60 deg.c for 0.5-1.5 hr, filtering at 30-34 deg.C, concentrating at 70-80 deg.C, recovering solvent, adding anhydrous sodium (or magnesium) sulfate, filtering for recovering sodium (or magnesium) sulfate, and adding petroleum ether to the filtrate. Its advantages are simple process, short period, low cost, and high quality of product.

Description

technical field [0001] The invention relates to a preparation method of natural pyrethrin original medicine. Background technique [0002] The production of high-purity pyrethrins usually requires steps such as decolorization, dewaxing, and sediment removal to produce high-purity pyrethrin products. In order to achieve this goal, the current method needs to be equipped with sedimentation tanks, filters, freezing devices, filters and other equipment to produce high-purity permethrin products, and the freezing process consumes electricity and time, which greatly brings inconvenience to production. And the produced pyrethrins will produce precipitation again after a certain period of time, which will affect the product quality. Contents of the invention [0003] The purpose of the present invention is to overcome the existing problems in the prior art and provide a preparation method for producing natural pyrethrins that meet international product quality requirements with t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A01N53/00C07C69/743
Inventor 王怀勇
Owner 红河森菊生物有限责任公司
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