Method for recovering methyl chloride in discharged tail gas of glyphosate / dimethyl phosphate production

Abstract

The invention discloses a method for recycling methyl chloride in tail gas emitted by glyphosate / dimethyl phosphite production, wherein, after gas-liquid separation, condensation, bathing, alkali cleaning, and drying are carried out on tail gas from the production technology of glyphosate / dimethyl phosphite, arid methyl chloride is compressed by a compressor and then copiously cooled to obtain methyl chloride; partial non-condensable gas unable to be absorbed through a freezing method is fed in the compressor through methyl chloride filtered by an organic vapor membrane to be compressed again; the rest gas is discharged to the upper air. The method for recycling methyl chloride in tail gas emitted by glyphosate / dimethyl phosphate production has the advantages that through the technology of combined copious cooling and organic vapor membrane recycling, the adoption of a DCS automatic air supply balanced system, and the core of a novel ripple packing tower, multi-level bathing, alkali cleaning, absorbing, and drying are carried out for repeatedly recycling methyl chloride gas, thus solving the problems of numerous gas production and unstable gas production of recycled methyl chloride, guaranteeing stable running of equipment, improving productivity effect, and improving recovery rate of methyl chloride from 93 percent to more than 99.5 percent; and environmental benefits and economic benefits are outstanding.

Description

technical field [0001] The invention relates to a method for recovering methyl chloride gas, in particular to a method for recovering methyl chloride in the tail gas produced in the production process of glyphosate / dimethyl phosphite. Background technique [0002] At present, the total domestic production capacity of glyphosate and dimethyl phosphite has reached more than 600,000 tons, and the annual by-product of methyl chloride tail gas is more than 400,000 tons. Enterprises cannot effectively recycle the by-product tail gas chloromethane. Chloromethane is a colorless, odorous gas that is toxic to humans. If the tail gas is discharged without treatment, it will reduce a sum of economic income for the enterprise, and more importantly, it will have a serious impact on the ambient air. Contents of the invention [0003] The object of the present invention is to provide a method for recovering methyl chloride in the exhaust tail gas produced by glyphosate / dimethyl phosphit...

AI Technical Summary

Problems solved by technology

The exhaust gas is discharged without treatment, which will reduce a certain amount of economic income for the enterprise, and more importantly, it will have a serious impact on the ambient air.

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