Sodium methyl mercaptide production process and device

Abstract

The invention discloses a process and a device for producing a sodium methyl mercaptide solution. The process comprises the following steps: enabling refined methyl mercaptan to enter a primary heat exchanger tube pass through a methyl mercaptan storage tank, and enabling a sodium hydroxide-sodium methyl mercaptide mixed solution collected from the bottom of a secondary absorption tower to enter aprimary heat exchanger shell layer, after heat exchanging, enabling the gasified methyl mercaptan to enter a primary absorption tower; enabling the sodium hydroxide-sodium methyl mercaptide mixed solution to enter the adsorption tower from the upper part of the primary adsorption tower, wherein a sodium methyl mercaptide finished product is collected from the bottom of the primary absorption tower; enabling the methyl mercaptan from the top of the primary absorption tower to enter the tower from a feeding port in the lower part of the secondary absorption tower; enabling liquid caustic soda from a liquid caustic soda storage tank to enter the absorption tower from the upper part of the secondary absorption tower, enabling a gas phase and a liquid phase to reversely contact and mix in thetower to obtain the sodium hydroxide-sodium methyl mercaptide mixed solution. The sodium methyl mercaptide produced through the process and the device can utilize the reaction heat as a methyl mercaptanvaporization heat source, thereby freely adjusting the concentration of the sodium methyl mercaptide; and meanwhile, the logistics and transportation cost of a manufacturer who takes the sodium methyl mercaptide as the production raw material is saved.

Description

technical field [0001] The patent of the invention belongs to the field of sodium methyl mercaptide production and preparation, and specifically relates to a process and a corresponding device for producing sodium methyl mercaptide solution using refined methyl mercaptan. Background technique [0002] Sodium methyl mercaptide is a colorless and transparent strong alkaline liquid with a special odor, which can be used as raw material for pesticides, medicines, and pigment intermediates, such as pesticide sigrazin, methomyl, and organic intermediate raw materials; food additives Raw materials for methionine, vitamin U, and rubber vulcanizing agents; antidotes for hydrogen sulfide poisoning; odorants for gas and natural gas, etc. The raw material of sodium methyl mercaptide usually used by domestic manufacturers is 20% sodium methyl mercaptide aqueous solution, which is transported to the factory by tank truck. Since the content of its effective component sodium methyl merca...

AI Technical Summary

Problems solved by technology

Among them, dimethyl sulfate is a highly toxic raw material, and there are great safety hazards in the process of use, storage and transportation

The final yield of sodium methyl mercaptide in the dimethyl sulfate-sodium hydrosulfide process is only about 75% to 80%, and a large amount of waste water containing organic matter is produced during the production process, which has a great impact on the environment

Chloromethane-sodium hydrosulfide process produces sulfide and a large amount of waste water containing sodium chloride and organic matter, and subsequent treatment is relatively difficult

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