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Method for purifying diatomaceous earth from chlorpyrifos

A purification method and technology of diatomite, applied in the field of purification of chlorpyrifos, can solve problems such as unsatisfactory operation, inconvenient operation, cumbersome recrystallization operation, etc., and achieve the advantages of easy operation, improved product yield and purity, and omission of recrystallization steps Effect

Inactive Publication Date: 2013-04-17
ANHUI COSTAR BIOCHEM CO LTD
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AI Technical Summary

Problems solved by technology

The recrystallization operation in this method is cumbersome and inconvenient to operate, and the yield is 92%~95%, which is not ideal

Method used

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Examples

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Embodiment 1

[0016] In a 3000L enamel glass reaction kettle, add 1100Kg water and 220Kg 3,5,6-trichloropyridin-2-alcohol sodium, stir well, then add 5Kg trimethylamine 30% aqueous solution, 0.5Kg 4-dimethylaminopyridine and 207Kg O, O-diethylthiophosphoryl chloride, add dropwise 10% sodium hydroxide solution to adjust pH = 9~10, heat up to 60°C for 1.5h, and transfer the reaction solution into a separatory tank to obtain chlorpyrifos oil-water system;

[0017] A diatomite purification method for chlorpyrifos, comprising the following steps:

[0018] (1) Demulsification and water separation: add Tween-80 to the oil-water system obtained by condensation of chlorpyrifos in the above water phase method, and its content is controlled at 200ppm, stir at 95°C for 0.8-1.2h, stand still for 1.8-2.2h and then divide Water, blowing into the washing kettle;

[0019] (2) Water washing: Add 5 times the volume of hot water to the washing kettle, heat to 80°C, 600-800 rpm, stir and wash for 0.8-1.2 hour...

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PUM

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Abstract

The invention discloses a method for purifying diatomaceous earth from chlorpyrifos. The method comprises the following steps: adding tween-80 in an oil-water system condensed by an aqueous phase process; washing the oil phase separated first with water at appropriate temperature; then, scouring with acid at appropriate temperature; and finally dehydrating and drying crude oil separated to obtain chlorpyrifos original product with the content over 98%. According to the method provided by the invention, the conventional separation process is modified and optimized, the recrystallization step which is fussy to operate is canceled, and the demulsification and scouring step is increased, so that the method is simple and reliable and convenient to operate, and the yield and purity of the product can be improved to over 98%.

Description

technical field [0001] The invention relates to the field of chemical purification, in particular to a method for purifying chlorpyrifos. Background technique [0002] Chlorpyrifos, chemical name O,O-diethyl-O-(3,5,6-trichloro-2-pyridyl) phosphorothioate, its molecular formula is C 9 h 11 Cl 3 NO 3 PS. As an organophosphorus insecticide, chlorpyrifos has high efficiency, broad spectrum and low toxicity. It is the first choice for replacing highly toxic organophosphorus insecticides such as methamidophos and parathion in my country's current pesticide structure adjustment. Its mechanism of action is to inhibit acetylcholinesterase. It has three modes of action: contact killing, stomach poisoning and fumigation. It can effectively control more than 100 kinds of pests and mites. The synthetic method of chlorpyrifos is mainly two-solvent method and aqueous phase method according to different solvents of the reaction. The dual-solvent method uses water and an organic solve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F9/58
Inventor 刘善和葛九敢王红明顾福海
Owner ANHUI COSTAR BIOCHEM CO LTD
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