Circulation production process for glyphosate

Abstract

The invention discloses a technology for the circular production of glyphosate, which pertains to the technical field of pesticide. An alkyl ester process is adopted to produce the glyphosate; chlorine and yellow phosphorus are used for producing phosphorus trichloride; the phosphorus trichloride and methanol react to produce dimethyl phosphate which is taken as a raw material to prepare the glyphostate and glyphostate mother solution; triethylamine separated from the glyphostate mother solution is reused and after the triethylamine is separated, alkali mother solution is then obtained; after sodium is removed by a membrane process, the alkali mother solution is divided into strong solution and weak solution, with the strong solution being used for preparing a glyhosate ammonium aqua and the weak solution being electrolyzed to obtain sodium hydroxide solution, chlorine and hydrogen, wherein, sodium hydroxide is used for recovering the triethylamine, the sodium hydroxide solution is used for neutralizing thin methanol, the chlorine is used for synthesizing phosphorus trichloride and the hydrogen is used for other purposes. The technology for the circular production of glyphosate has good effect in triethylamine recovery, high recovery rate, low cost and high removal rate of sodium chloride in the alkali mother solution, forms large-scale circular production of the glyphosate, and is characterized by reduction in logistics cost, high comprehensive utilization, less environmental pollution, compliance with the development concept by industrial recycling economy and remarkable comprehensive benefits.

Description

technical field [0001] The invention belongs to the technical field of pesticides, in particular to a glyphosate cycle production process. Background technique [0002] Glyphosate is the systemic herbicide with the largest sales volume and the fastest growth rate in the world, and with the successful development and popularization of glyphosate-transgenic crops and the shortage of energy sources, it has led to the sowing and promotion of biofuel crops. The production of phosphine offers new opportunities. [0003] Glyphosate (glyphosate), the chemical name is N-(phosphine carboxymethyl) glycine, the pure product is a non-volatile white solid, the specific gravity is 0.5, it melts at about 230 ° C, and it is accompanied by decomposition. The solubility in water at room temperature Only 1.2 grams, insoluble in general organic solvents, its isopropylamine salt is completely soluble in water, non-flammable, non-explosive, stable in normal temperature storage, and corrosive to m...

AI Technical Summary

Problems solved by technology

The traditional mother liquor treatment is steam concentration, high energy consumption, serious equipment corrosion, and low concentration ratio. The mother liquor after treatment can only be formulated into a low-content 10% glyphosate preparation, and the aqueous solution is saturated with sodium chloride. Long-term application causes soil compaction and poor dispersion, resulting in crop yield reduction

The sodium chloride obtained by steam concentration treatment is not high in content, and the treatment cost is high; the use of ammonia instead of liquid caustic soda to neutralize the mother liquor to recover triethylamine solves the adverse effects caused by the formation of sodium chloride salt, but due to the low alkalinity of ammonia, It is similar in nature to triethylamine, and similar to miscible, resulting in low recovery rate and high recovery cost; others use partial or step-by-step neutralization, the process is complicated, and the yield and cost are not ideal