Process of high purity pyrethrins

A technology of pyrethrin and a production method, which is applied in the production field of high-purity pyrethrin, can solve the problems of unseen industrialized production, impossible industrialized production, and high production cost, and achieves enhanced market competitiveness, standardized production method, and short production time. Effect

Inactive Publication Date: 2004-06-02
中植生物科技开发有限责任公司
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  • Claims
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Problems solved by technology

At present, there are only a few companies in the United States, Kenya and other countries that can produce this product, and the process is complicated, and the oil yield is low, so it cannot be industrialized. Between 59%: Japan’s Takasago Spice Company uses centrifugal molecular distillation to purify, but the content of permethrin in the product does not exceed 50%, and the production cost is too high to be industrialized: Australia has developed this industry since the 1980s, but its processing

Method used

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  • Process of high purity pyrethrins
  • Process of high purity pyrethrins
  • Process of high purity pyrethrins

Examples

Experimental program
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Example Embodiment

[0018] Example 1:

[0019] 1. Preparation of crude pyrethroid extract:

[0020]

[0021] 2. Add 2% antioxidant BHT by weight to the crude pyrethroid extract;

[0022] 3. Dissolution of crude pyrethroid extract: Take 228 kg of crude pyrethroid extract (the content of pyrethroid is about 29%, see figure 1 ), add 5 times ethanol and stir, dissolve at 30°C for 1.5 hours, filter to remove insoluble matter, and prepare ethanol solution;

[0023] 4. Freeze the ethanol solution. Cool the ethanol solution prepared in 2 from room temperature to -20°C, and filter to remove the frozen precipitates to obtain ethanol freezing solution;

[0024] 5. Decolorization of ethanol freezing solution: Pass the ethanol freezing solution through a decolorizing device filled with 20 kilograms of activated carbon, and then wash the activated carbon with 50 kilograms of ethanol, and the eluate is merged into the ethanol freezing solution;

[0025] 6. Recovery of solvent ethanol: at -0.060Mpa to -0.075Mpa n...

Example Embodiment

[0028] Example 2:

[0029] 1. Preparation of crude pyrethroid extract: the same as in Example 1;

[0030] 2. Add 3% antioxidant BHT by weight to the crude pyrethroid extract,

[0031] 3. Dissolution of crude pyrethroid extract: Take 260.34 kg of crude pyrethroid extract (the content of pyrethroid is about 20.0%, see image 3 ), add 6 times methanol and stir, dissolve at 35°C for 1.5 hours, filter to remove insoluble materials, and prepare methanol solution;

[0032] 4. Freeze the methanol solution. Cool the methanol solution prepared in 2 from room temperature to -20°C, filter and remove the frozen precipitates to obtain methanol freezing solution;

[0033] 5. Decolorization of methanol freezing liquid: the methanol freezing liquid is passed through a decolorizing device filled with 20 kg of activated carbon, and then 50 kg of methanol is used to wash the activated carbon, and the eluent is merged into the methanol freezing liquid;

[0034] 6. Recovery of solvent methanol: at -0.0...

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Abstract

The production process of high-purity pyrethrin includes adding into the coarse pyrethrin extractive antioxidant BHT in the amount of 2-3 % weight of coarse pyrethrin extractive; dissolving in ethanol or methanol solvent in 5-7 times weight of coarse pyrethrin extractive at 25-30 deg.c for 1-1.5 hr before filtering to eliminate insoluble matter; freezing the solution at temperature below -20 deg.c; decolorizing the frozen liquid and concentrating to obtain ethanol or methanol concentrate while recovering ethanol or methanol; dissolving in petroleum ether solvent in 7-8 times weight of ethanol or methanol concentrate at 30-40 deg.c for 1-1.5 hr before filtering to eliminate insoluble matter; and concentrating to obtain high-purity pyrethrin while recovering petroleum ether solvent. The said process raises the content of pyrethrin in the product, reduces pollution and raises the safety of using the product.

Description

Technical field [0001] The invention relates to the technical field of natural insecticides, in particular to a method for producing high-purity pyrethrins. Background technique [0002] Pyrethrin refers to the total name of six effective insecticidal components in natural pyrethrum chrysanthemum. High-purity pyrethrin refers to yellow-brown oil containing more than 50% of pyrethrin in pyrethrum extract, which is a refined product. At present, only a few companies in the United States, Kenya and other countries can produce this product, and the process is complex, the oil yield is low, and it cannot be industrially produced. For example, the commercial pyrethrin (pyrethrin) produced by the U.S. company only contains 20~ Between 59%: Japan’s Takasago Perfume Company uses centrifugal molecular distillation to purify, but the content of pyrethroid in the product does not exceed 50%, and the production cost is high, which cannot be industrialized: Australia has developed the industry...

Claims

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Application Information

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IPC IPC(8): A01N53/02
Inventor 郝正喜张泽华陈建民易云贵
Owner 中植生物科技开发有限责任公司
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