A kind of continuous recovery device and continuous recovery process of glyphosate hydrolysis gas phase

Abstract

The invention provides a continuous recovery device and continuous recovery process of glyphosate hydrolysis gas phase. The present invention uses water washing and rectification to remove hydrogen chloride and water in the glyphosate hydrolysis gas, compared with the prior art, which adopts the method of adding alkali for neutralization and deacidification, and avoids the occurrence of high-temperature alkalinity of methyl chloride in the process of alkali addition and neutralization The hydrolysis of the environment reduces the loss of methyl chloride, increases its yield, and does not produce saline wastewater; it also makes deacidification and dehydration a one-step operation, and the operation is simple; the invention also recovers glyphosate by means of absorption + rectification The methyl chloride in the phosphine hydrolysis gas can avoid the hazardous waste produced by the drying of concentrated sulfuric acid in the prior art and improve the product yield; the present invention also uses the methylal component separated from the glyphosate hydrolysis gas itself as an absorbent and puts it into the methyl chloride for absorption Absorption and separation of methyl chloride in the tower eliminates the need to introduce additional absorbents, which reduces costs; and no other materials with new components are introduced for absorption, which can avoid the introduction of impurities and improve the purity of methyl chloride products.

Description

technical field [0001] The invention relates to the field of recovery of glyphosate by-products in chemical production, in particular to a continuous recovery device and continuous recovery process of glyphosate hydrolysis gas phase. Background technique [0002] As a non-selective, non-residue herbicide, glyphosate is very effective especially for perennial root weeds, especially because of its high efficiency, low toxicity, broad spectrum, and no residue, it has been more and more popular. high attention. It was developed by Monsanto in the early 1970s, and it is generally used as isopropylamine salt or sodium salt. Wherein, during the production of glyphosate by the glycine method, a large amount of methyl chloride will be produced by-product, and its preparation route is roughly as follows: using glycine+paraformaldehyde+dialkyl phosphite (such as dimethyl phosphite) as raw material, in methanol A condensation reaction occurs under the action of a solvent and a triethy...

AI Technical Summary

Problems solved by technology

However, in the above-mentioned process, the hydrolysis of methyl chloride in a high-temperature alkaline environment will occur during the gas phase process of adding alkali and neutralizing the hydrolysis, which will consume methyl chloride and cause by-product loss. In addition, salty wastewater will be produced, resulting in dangerous recovery of methyl chloride. Waste, not environmentally friendly, long process

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