Production technology of high-purity sodium methyl mercaptide

A technology of sodium methyl mercaptide and production process, which is applied in the field of production technology of high-purity sodium methyl mercaptide, can solve the problems of high transportation cost, high use cost and high impurity content, and achieves reduction of equipment investment and operation cost, and reduction of transportation cost. Effect

Inactive Publication Date: 2016-02-17
白国强
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Problems solved by technology

[0003] The invention provides a production process of high-purity sodium methyl mercaptide to solve the problems of high transportation cost, high use cost and high impurity content of low-purity sodium methyl mercaptide products existing in the prior art

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  • Production technology of high-purity sodium methyl mercaptide

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Embodiment Construction

[0015] As shown in the figure, a kind of production technique of high-purity sodium methyl mercaptide, concrete process steps are as follows:

[0016] (1) Reaction: Pre-add a quantitative amount of sodium hydrosulfide with a mass content of about 32% into the reactor, and then continuously and uniformly add 98% of dimethyl sulfate, dimethyl sulfate and sodium methyl mercaptide into the reactor The reaction produces methyl mercaptan and sodium sulfate, the reaction temperature is controlled at about 75°C, and the pressure is controlled at a slight positive pressure or a slight negative pressure;

[0017] (2) Alkali absorption: The reacted methyl mercaptan gas is washed to remove impurities in four stages, and then the water is removed by cyclone separation. The pure methyl mercaptan gas after removing impurities is absorbed by two stages of alkali to generate methyl sulfide Sodium alkoxide solution, using the difference in solubility of sodium methyl mercaptide at different tem...

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Abstract

A production technology of high-purity sodium methyl mercaptide includes the steps that a reaction product of the raw materials of sodium hydrosulfide and dimethyl sulfate is subjected to washing and alkali liquor absorption for concentration adjustment and then subjected to cooling crystallization and drying, and then the high-purity sodium methyl mercaptide product is obtained. By means of the technology, the high-purity sodium methyl mercaptide liquid or solid product can be obtained, the transportation cost of the sodium methyl mercaptide product is greatly lowered, meanwhile, the equipment investment and operating cost of manufacturers using sodium methyl mercaptide are also lowered, and requirements of sodium methyl mercaptide using markets are met.

Description

technical field [0001] The invention relates to the technical field of sodium methyl mercaptide production, in particular to a production process of high-purity sodium methyl mercaptide. 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. At present, its production process basically adopts the reaction of sodium hydrosulfide and dimethyl sulfate (or methyl chloride) to generate methyl mercaptan gas, and then absorbs it into 20% sodium methyl mercaptan solution with liquid caustic soda, low-purity methyl mercaptan Sodium solution is the final product of the current process, and it is sent to the user manufacturer. These low-purity sodium methylmercaptan products have the following defects: 1. High transportation costs; 2. High operating costs, requiring the use of larger size reaction Containers are pr...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C319/02C07C319/12C07C321/04
CPCC07C319/02C07C319/12
Inventor 白国强
Owner 白国强
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