The invention relates to an acidolysis and
solvent recycling process for producing
glyphosate by using a
glycine method, and belongs to the technical field of
glyphosate production processes and methods. The acidolysis and
solvent recycling process comprises steps of pretreatment for removing
methanol from a synthetic liquid, acid
methanol acidolysis,
hydrochloric acid acidolysis,
solvent recycling and the like. Acid
methanol is adopted to replace
hydrochloric acid for acidolysis of the synthetic liquid, and a small amount of
hydrochloric acid is additionally supplied to stabilize the high-temperature acidolysis process in a later acidolysis period; in the acidolysis process, methylal is separated from a methylal and methanol solution through rectification, a small amount of methanol is replenished into the residual methanol solution which is cooled so as to blend the content of the methanol, the solution can be directly used for absorbing a
hydrogen chloride gas, acid methanol can be generated after set contents of
hydrogen chloride and methanol are met, and the acid methanol canbe fed back to the acidolysis process for reuse. Compared with a conventional
glyphosate acidolysis and solvent recycling technique with a
glycine method, the acidolysis and solvent recycling process has the advantages that the methanol recycling
wastewater can be reduced by 2.5 t / t or greater, the mother liquid amount can be reduced by 0.3 t / t or greater, the steam consumption can be reduced by 1.5 t / t or greater, the power can be saved by 80 KWh / t or greater, the content of
chloromethane can be increased by 0.3 t / t, the yield of glyphosate is increased by 0.3% or greater, and the production cost of the glyphosate can be lowered by 15-20%.