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A kind of method of reclaiming pymetrozine

A pymetrozine and acid technology, which is applied in the field of pymetrozine recovery, can solve the problems of large mixing of pymetrozine, waste of resources, increased pressure on environmental protection and the like

Active Publication Date: 2021-04-20
HEBEI VEYONG BIO CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the existing pymetrozine production process, the pymetrozine adhered to the equipment shell and the ground cannot be effectively recovered due to the mixing of a large amount of dust, rust, enamel debris and other mechanical impurities, resulting in waste of resources, increased environmental protection pressure and production costs problem, the invention provides a method for reclaiming pymetrozine

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Take 10 g of the crude product containing pymetrozine obtained by cleaning up the pymetrozine production equipment, the mass content of pymetrozine is 88.2%, add 40 g of glacial acetic acid, stir and dissolve at 30 ° C, filter to remove insoluble mechanical impurities such as dust and rust, and obtain the filtrate . The filtrate was distilled under reduced pressure, acetic acid was evaporated and recovered, then 40 g of methanol was added to the filtrate, stirred at 30°C, filtered, and the filter retentate was vacuum-dried at 70°C to obtain 8.56g of pymetrozine with a purity of 98.5%. , the yield of pymetrozine reached 95.6%.

[0023] Wherein, the purity of pymetrozine=(the quality of pymetrozine obtained in the former drug of pymetrozine / the quality of the former drug of pymetrozine obtained)×100%; the yield of pymetrozine=(the former product of pymetrozine obtained The mass of pymetrozine in the drug / the mass of pymetrozine in the crude product containing pymetrozine...

Embodiment 2

[0025] Take 10 g of the crude product containing pymetrozine obtained by cleaning the pymetrozine production equipment, the mass content of pymetrozine is 86.9%, add 40 g of formic acid, stir and dissolve at 30 ° C, filter to remove mechanical impurities such as dust and rust, and obtain the filtrate. The filtrate was distilled under reduced pressure, acetic acid was distilled off and recovered, and then 40 g of methanol was added to the filtrate, stirred at 30° C., filtered, and the filter retentate was vacuum-dried at 70° C. to obtain 8.40 g of pymetrozine with a purity of 97.5%. , the yield of pymetrozine reached 94.3%.

Embodiment 3

[0027] Take 10 g of the crude product containing pymetrozine obtained by cleaning the pymetrozine production equipment, the mass content of pymetrozine is 87.2%, add 40 g of butyric acid, stir and dissolve at 30 ° C, filter to remove mechanical impurities such as dust and rust, and obtain the filtrate . The filtrate was distilled under reduced pressure, acetic acid was evaporated and recovered, then 40 g of methanol was added to the filtrate, stirred at 30°C, filtered, and the filter retentate was vacuum-dried at 70°C to obtain 8.47g of pymetrozine with a purity of 97.1%. , the yield of pymetrozine reached 94.3%.

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Abstract

The invention relates to the technical field of pesticide recovery, and specifically discloses a method for recovering pymetrozine. The method for recovering pymetrozine comprises the following process steps: a, dissolving the collected crude pymetrozine in an acidic liquid, and filtering to obtain a filtrate; the acidic liquid is RCOOH or RCOOH aqueous solution; b, distilling off the filtrate Add a solvent to the acidic liquid, filter and dry to obtain pymetrozine; the solvent is one of methanol, ethanol and water. The method for recovering pymetrozine provided by the present invention is simple in operation, low in recovery cost and short in time, the whole process does not involve the discharge of toxic and harmful solvents, and the recovered pymetrozine has high purity and yield, reducing the production of pymetrozine Waste of resources and environmental pressure in the process.

Description

technical field [0001] The invention relates to the technical field of pesticide recovery, in particular to a method for recovering pymetrozine. Background technique [0002] Pymetrozine, also known as pyrazinone, is a new type of heterocyclic non-biocide insecticide, which has low toxicity to non-target organisms, obvious insecticidal effect, strong pertinence and less threat to the environment, and has good security. After pymetrozine is applied, it can quickly penetrate into the leaves of plants, and the residual effect period is more than 1 month. It has a high effect on insects, planthoppers, leafhoppers, whiteflies, stink bugs, etc. Effectiveness. [0003] Pymetrozine technical is white powder, during the process of drying and transferring, part of pymetrozine will adhere to the equipment shell or the ground, mixed with a lot of dust, rust and other mechanical impurities, and Due to the corrosion of the reaction kettle, the shedding of enamel and other reasons, rust...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D401/12
CPCC07D401/12
Inventor 范立攀高永民史秀肖李志峰贾成国
Owner HEBEI VEYONG BIO CHEM
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