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Method for purifying piperonyl butoxide synthesized from sassafras oil

A technology of piperonyl butoxide and purification method, which is applied in the direction of organic chemistry, can solve the problems of long operation period, difficult to control polymerization conversion, low yield, etc., and achieve the effect of short operation time, simple operation and high yield

Inactive Publication Date: 2006-05-10
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

The separation and purification methods reported in the two patents of GB857541 and GB1344850 all use high vacuum rectification separation method. Due to the pressure drop of the rectification tower body and the inherent certain liquid holding capacity of the tower kettle, the whole system must reach a high degree of vacuum. It is difficult to ensure that the temperature of the tower kettle is lower than 230°C in actual production
The application of the above separation method has the disadvantages of long operation period, low yield and difficulty in controlling the polymerization conversion.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0007] Add 100g piperonyl butoxide liquid mixture into the feeder of the molecular distillation device (feeder volume 250ml, evaporation area 0.048 square meters, film wiper speed 50~1000rpm), the active ingredient piperonyl butoxide content of the mixture is 46.37 %. Turn on the raw material preheating device, raise the temperature to 85°C, and maintain a constant temperature. Turn on the cooling device, keep the cooling temperature at 20°C, add liquid nitrogen into the cold trap, turn on the rotary vane vacuum pump and the oil diffusion pump, make the operating pressure of the system reach 0.1Pa, turn on the precision constant temperature tank for evaporating materials to conduct heat transfer oil Heating, so that the temperature is stabilized at the required evaporation temperature of 92 ° C, then start feeding, the feed rate is 100g / h, the rotating speed of the wiper is 140rpm, after the distillation process ends, distillate 41.2g, heavy fraction 58.8 g: Distill the heavy...

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Abstract

The invention discloses a method for purifying piperonyl butoxide synthesized from sassafras oil, which belongs to the deep processing and utilization technology of sassafras oil. The method adopts a molecular distillation device, the pressure is 0.01-100Pa, the evaporation temperature is 90-200°C, the cooling temperature is -15-80°C, the temperature difference between the evaporator and the condenser is 30-120°C, and the stirring rate is 10-1000 rpm The operating conditions are two-stage separation to obtain piperonyl butoxide with a purity of over 98%. The invention has the advantages of simple process, short operation time, high yield, no other high boiling substances produced in the process, no polymerization, and no pollution to the environment.

Description

technical field [0001] The invention relates to a method for purifying piperonyl butoxide synthesized from sassafras oil, which belongs to the deep processing and utilization technology of sassafras oil. Background technique [0002] Piperonyl butoxide is a very effective synergist for pyrethrin insecticides. It prevents insects from developing resistance by inhibiting the multifunctional oxidase of insects, thereby increasing the insecticidal effect. Patents such as WO02087337, CN1381181, GB2388778, RU2146090, GB829556, US3920440 (A1), US5883112, GB1415515 and US2904464 report the main application fields of piperonyl butoxide: piperonyl butoxide is added to pyrethrins and is mainly used in food in agriculture Prevention and control of crop pests such as cotton, fruits and vegetables; killing mosquitoes, flies and moths in clothing at home; protecting construction and textile materials by inhibiting moths; widely used in the food industry to kill and prevent production work...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D317/54
Inventor 许松林应安国王淑华向爱双徐世民
Owner TIANJIN UNIV
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