Method and apparatus for separating acetyl methamidophos from neutral solution

Abstract

The invention relates to a method and device used to separate acephate from neutralizer. The device replaces original centrifuge extraction plant with high efficiency filling extracting tower which is made up of tower body, filling, filling position limit board, filling supporting board, liquid distributor, and re-distributor. The separating method is batch extraction operation that extracting agent is sent into tower upper organic phase inlet by organic charge pump and flows down; neutralizer is sent into tower bottom water phase inlet by water phase charge pump and dispersed by distributor both of which are fully contacted at tower inner filling surface to reach high efficiency mass transfer. The loaded extracting agent flow out from the bottom of tower through settling section nature split phase; and its rest overflow out from the top of the tower through settling section nature split phase. Compared with traditional box type centrifuge extraction method, it has the advantages of high separating efficiency, large flux, and low energy consumption etc.

Description

technical field [0001] The invention belongs to the extraction technology of organic pesticides, in particular to a method and a device for separating acephate from a neutralization liquid. Background technique [0002] O, S-dimethylphosphorothioate (i.e., acephate) is a systemic broad-spectrum organophosphorus insecticide with low toxicity and is a low-toxicity insecticide. It is effective for rice, cotton, corn, It has a good control effect on pests of vegetables, fruit trees, sugarcane and other crops. It is safe to use in the surrounding environment. Today, when environmental protection is strengthened and pesticides are developing from high toxicity to low toxicity, it will be an ideal variety, and its application range and market prospects are very broad. [0003] At present, the production of acephate generally uses O, O-dimethylphosphorothioate as a raw material, and under the action of a catalyst, it is first isomerized and then acetylated to synthesize acephate. ...

AI Technical Summary

Problems solved by technology

This process route is relatively mature, but there are still some problems in the follow-up extraction operation process, which are specifically shown in: 1) acephate will crystallize during the extraction process, which easily makes the extractor blocked, especially when centrifugal extraction equipment is used. The damage to the equipment is more serious, and frequent maintenance affects production; 2) The residual concentration of acephate in the raffinate is relatively high, mainly due to abnormal extraction operations; 3) Multi-stage centrifugal extraction equipment is used, due to the Crystallization often exists, resulting in unbalanced high-speed rotation system, high motor operating current, and high energy consumption

Images