Environmental protection treatment device for sodium methyl mercaptide production and its environmental protection treatment process

Abstract

The invention discloses a sodium methyl mercaptide production environment-protecting processing device and technology. The device comprises a technology waste liquid processing mechanism and a technology waste gas processing mechanism which mainly comprises a burner, an air preheater, a front absorption tower and a back absorption tower. The technology waste liquid processing mechanism mainly comprises an acid pickling device, a sulfuric acid middle tank, a waste liquid filtering tank, a sodium sulfate solution circulating tank, a crystallization liquid circulating pool, a crystallization tower, a flash dryer, an anhydrous sodium sulphate storage tank, a washer group, an alkali liquid middle tank and a humidifying evaporator. Sodium methyl mercaptide production waste liquid and waste gas are creatively combined organically for processing, technology waste gas high in combustion value is used for incineration and absorbing, sodium sulfite by-products are obtained, a large amount of high-temperature gas is obtained, the high-temperature gas is used for obtaining anhydrous sodium sulphate by-products with higher value, the purposes of sodium methyl mercaptide production deodorization disinfecting and environment improving can be achieved, sodium bisulfide, sodium sulfite and anhydrous sodium sulphate can be obtained by recycling, and the production cost of sodium methyl mercaptide is lowered.

Description

technical field

[0001] The invention relates to the technical field of environmental protection treatment of sodium methyl mercaptide, in particular to an environmental protection treatment device for producing sodium methyl mercaptide and an environmental protection treatment process thereof. Background technique

[0002] Sodium methyl mercaptide is an important organic intermediate compound, which can be used to produce a variety of pesticides such as methomyl, aldicarb, etc., and feed additives such as methionine. Its production process mostly uses the reaction of sodium hydrosulfide and dimethyl sulfate (or methyl chloride) to generate methyl mercaptan gas, which is then absorbed by liquid caustic soda into a 20% sodium methyl mercaptide solution, which will inevitably produce Odor, toxic pollutants, and wastewater containing sodium bisulfide and a small amount of volatile by-product methyl sulfide. In recent years, many domestic manufacturers of sodium methyl mercaptan...

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