Mixed extractant for extracting methamidophos from crude oil

Abstract

The invention relates to mixed extractant for extracting methamidophos from crude oil and comprises mixed solvent consisting of solvent S and solvent K in volume ratio of 1:4-4:1; wherein, the solvent S is trichloroethylene or benzene and the solvent K is toluene, xylene or normal hexane. The solvent S and the solvent K of the invention can be miscible well, the two components can be used to make up for each other to increase the extractability, the chemical stability, the thermal stability and the phase separation property are good, the solvent loss and the toxicity are reduced, the extraction process is mature, the flow is simple, the economic benefit is obvious, the loss of the extractants is low which are not easy to emulsify, the extraction ability is strong, and the extractants are accessible and easy to recycle with a wide use range. The extracted methamidophos has high purity which can be directly used for the production and the application of methamidophos derivatives such as acephate and the like; the recovery rate of spermine is higher and the recycled spermine can be directly used to synthesize methamidophos.

Description

technical field [0001] The invention relates to a mixed extractant used for extraction of methamidophos crude oil. Background technique [0002] Methamidophos and acephate are currently the most widely used pesticides in my country. They both belong to a water-soluble broad-spectrum insecticide and acaricide, which have stomach poisoning, contact killing and systemic effects, and can be used to control rice and corn. , cotton and other crops of various pests. Due to the high toxicity of methamidophos, the use of methamidophos as a pesticide has been banned in China since 2007, but it can still be produced and used as intermediates and raw materials for low-toxic methamidophos derivatives such as acephate. So far, there are more than 50 methamidophos manufacturers in China, and the production processes used are basically the same. According to the processes currently used by these enterprises, the content of methamidophos is generally about 80%, and the main impurity is trime...

AI Technical Summary

Problems solved by technology

Among them, the extraction efficiency of 1,1,1-trichloroethane and 1,2-dichloroethane is low, which directly affects the processing capacity of the extraction equipment and the operating cost of the extraction process, and also determines the extraction efficiency of 1,1,1-trichloroethane. Ethyl chloride and 1,2-dichloroethane are not suitable as extraction agents for crude oil of methamidophos

Benzene has high extraction efficiency and easy-to-obtain raw materials, but it is highly toxic, has a low boiling point, is volatile, and the solvent is easily lost, polluting the environment

Images