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Method for reclaiming waste water of refining dipterex production technique

A technology of refining trichlorfon and production process, which is applied in the field of pesticide wastewater recycling, can solve the problems of small processing capacity, high processing cost, and large equipment investment, and achieve the goal of reducing COD emissions, improving environmental pollution, and low processing cost Effect

Inactive Publication Date: 2008-07-09
荆州沙隆达控股有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If it is directly discharged and seriously pollutes the environment, biochemical treatment is required. Because of the high COD value, the treatment is difficult, resulting in both product loss and environmental pollution.
Generally adopt concentrated crystallization process to handle now, this method has many problems such as single batch processing time is long, processing capacity is small, product recovery rate is low (only 40~50%), equipment investment is big, processing cost is high etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0013] Refining trichlorfon production process wastewater, containing 5.4% trichlorfon, adding 1500Kg to the reaction kettle through the high tank, then adding 250Kg NaCl and stirring in the kettle for 20-30 minutes, crystallizing and filtering to obtain the wet product trichlorfon raw powder 92Kg, after drying, the trichlorfon solid is 86Kg, the content is 90.5%, and the acid content is 0.17%. The product recovery rate is 96.10%, and the discharged wastewater contains 0.19% trichlorfon.

example 2

[0015] Refined trichlorfon production process wastewater, containing 7.91% of trichlorfon, added 1500Kg to the reaction kettle through the high tank, then added 560Kg of ammonium sulfate and stirred in the kettle for 20-30 minutes, crystallized and filtered to obtain the wet product trichlorfon The original powder is 135Kg, and after drying, the trichlorfon solid is 123Kg, the content is 92%, and the acid content is 0.15%. The product recovery rate is 95.37%, and the discharged wastewater contains 0.28% trichlorfon.

example 3

[0017] Refined trichlorfon production process wastewater, containing 5.4% trichlorfon, add 1500Kg to the reaction kettle through the high tank, then add 200Kg of sodium chloride and 50Kg of sodium sulfate, stir in the kettle for 20-30 minutes, crystallize and filter to obtain Wet product trichlorfon raw powder 92Kg, after drying trichlorfon solid is 86Kg, content 90.5%, acid content 0.17%. The product recovery rate is 96.10%, and the discharged wastewater contains 0.19% trichlorfon.

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PUM

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Abstract

The invention relates to a method for recycling pesticide waste water, in particular to a method for recycling pesticide water of refined dipterex manufacturing art, wherein waste water from refined dipterex manufacturing art is filled with salt and is diluted to reach saturation state, and dipterex crystal which is diluted in the waste water is separated out, thereby diperex in the waste water is recycled. Adopting the invention can greatly improve the recycling rate of dipterex more than 95%, and the invention has the advantages of simple art, small equipment invest, large process capability, low process cost, and has excellent economic and environment-protection benefit.

Description

technical field [0001] The invention relates to a method for recycling pesticide wastewater, in particular to a method for recycling wastewater in a refined trichlorfon production process. Background technique [0002] The chemical name of trichlorfon is 0,0-dimethyl-(2,2,2-trichloro-1-hydroxyethyl) phosphate, which is widely used in agriculture, fishery and veterinary medicine, and has good effect The organophosphorus insecticide, the pure product is a white crystal at room temperature, has a special aldehyde pungent smell, and the industrial product is a white crystalline solid. [0003] The refining process of trichlorfon is to use methanol, phosphorus trichloride, and chloral as raw materials to synthesize crude trichlorfon, put it into a dissolution kettle, add a certain amount of water to heat up and dissolve, then cool down to crystallize, and centrifugally filter and dry , to obtain a high content of refined trichlorfon powder. The waste water produced in the refin...

Claims

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Application Information

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IPC IPC(8): C07F9/40C02F1/58
Inventor 何富春殷宏薛光才杨光富王洪群刘建华周用义吴庆芳陈林张诗忠文琴
Owner 荆州沙隆达控股有限公司