Method for preparing methanthiol

Abstract

The invention discloses a method for preparing methanthiol. The method comprises the following steps: loading potassium tungstate into a carrier-Al2O3 in a conventional impregnation method; adding zinc chloride solution into the carrier to ensure that the quality content of the zinc chloride in the whole catalyst is 2-20 percent; impregnating and drying the mixture to reach a constant weight and roast for 1-6 hours; feeding hydrogen sulfide and liquid methanol according to a molar ratio of 1 to 10 in a mixed mode; pre-heating and vaporizing the mixed material at 260-300 DEG C; introducing the material into a reactor to fully contact the catalyst to react under the pressure of 0.5-1.0MPa at the regulation reaction temperature of 320-390 DEG C for 2-4 hours to obtain mixed gas; and performing separation treatment on the mixed gas to obtain a garget product of methanthiol. By adopting the method, the methanol conversion ratio is improved while the high selectivity of the methanthiol is maintained at the same time, the reaction condition is mild, and the production cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, in particular to a method for preparing methyl mercaptan. [0002] Background technique [0003] Methyl mercaptan (CH 3 SH) also known as sulfhydromethane and methanethiol, is an important intermediate in organic synthesis and has a wide range of applications in synthetic materials, feed, pesticides and medicine, such as the synthesis of methionine, fenthion, and permethrin , profenfos, promethazine, methanesulfonyl chloride, methionyl propanol and other intermediates. Methionine synthesized by the reaction of methyl mercaptan and acrolein is widely used in the feed industry, pharmaceutical industry, health care industry and food industry. The increasing demand for methionine also stimulates the production and development of methyl mercaptan. [0004] Methanol (CH 3 OH) is the simplest saturated alcohol, and it is also an important chemical industry basic raw material and clean liqu...

AI Technical Summary

Problems solved by technology

At present, the industrial production of methyl mercaptan at home and abroad mainly uses hydrogen sulfide and methanol gas phase catalytic synthesis, the reaction conditions are usually hydrogen sulfide and methanol molar ratio 1-10, the reaction temperature is 350-450 ℃, the pressure is generally about 0.9-2.0Mpa, the reaction The catalyst used is generally composed of a carrier and main active components. The reaction conditions are relatively harsh, and there are high requirements for reaction equipment. The yield and selectivity of methyl mercaptan are low, and high energy consumption leads to high production costs.

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