Process and equipment for one-step continuous production of dimethyl disulfide

Abstract

The invention discloses a one-step continuous production technology and device of dimethyl disulfide. The technology comprises the following steps of mixing and preheating raw materials of methanol and hydrogen sulfide in a preheater until temperature reaches 200-400 DEG C, and adding the gaseous raw materials of methanol and hydrogen sulfide obtained after preheating into a reactor from the top; heating a raw material of sulfur to 445-450 DEG C, and adding the gaseous raw material of sulfur into the reactor from a sulfur feeding inlet in the top of the reactor; heating the raw materials of methanol, hydrogen sulfide and sulfur through a heat-transferring coil in the reactor to 400-500 DEG C; with a pressure of 50 kPa-200 kPa, making the raw materials of methanol, hydrogen sulfide and sulfur pass a catalyst bed from top to bottom in the reactor, and obtaining dimethyl disulfide and water after a one-step reaction. The non-condensable gas in the synthesized exhaust gases is hydrogen sulfide, and can be reused as a raw material after direct recycling. Due to a small amount of non-condensable hydrogen sulfide in the rectified exhaust gases, no other waste needs discharging during regular production, and a small amount of waste water is discharged only during facility cleaning and maintenance. Therefore, the raw material utilization rate gets close to 100% in the technology.

Description

technical field [0001] The invention belongs to the technical field of organic chemical industry, and specifically relates to a process for producing dimethyl disulfide through one-step reaction using methanol, hydrogen sulfide and sulfur as raw materials and a supporting device thereof. Background technique [0002] Dimethyl disulfide (DMDS) is an important chemical product with a wide range of uses. In the pesticide industry, it is used as an intermediate for the preparation of pesticides; in the petroleum industry, it can be used as an anti-corrosion and anti-scorch agent for ethane cracking furnaces, a vulcanizing agent for oil hydrogenation catalysts, and dehydroxylation of benzene nuclei. Inhibitor of hydrocracking in medium; in rubber industry, it can be used as solvent, regenerant, softener and plasticizer; in addition, DMDS can also be used as fuel, lubricant additive and inhibitor of some organic chemical reactions. It is mainly used in pesticide, dyestuff, petrol...

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Problems solved by technology

[0003] At present, most domestic dimethyl disulfide is produced by the dimethyl sulfate method. Since dimethyl sulfate is a highly toxic chemical, this process faces serious environmental protection and safety risks. At the same time, a large amount of sodium sulfate solution is produced by this method. deal with

[0004] There are foreign reports on the production of dimethyl disulfide by the direct oxidation of methyl mercaptan. However, due to the direct gas phase mixing of methyl mercaptan and oxygen, it is easy to form an explosive mixture, which leads to serious safety risks in this method, and the reaction conditions are difficult to control. The current method There are only a small number of experimental reports, and industrial production has not been realized

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