Method for preparing methanthiol

A technology of methyl mercaptan and catalyst, which is applied in the field of preparing methyl mercaptan, can solve the problems of low yield and selectivity of methyl mercaptan, higher requirements for reaction equipment, and harsh reaction conditions, etc., so as to improve methanol conversion rate and reduce Reaction energy consumption and low reaction temperature requirements

Inactive Publication Date: 2013-03-27
GUIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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  • Method for preparing methanthiol

Examples

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Effect test

Embodiment 1

[0018] A method for preparing methyl mercaptan, comprising the following steps:

[0019] (1) Preparation of catalyst: Potassium tungstate is loaded onto the carrier by conventional impregnation method -Al 2 o 3 Then add zinc chloride solution so that the mass content of zinc chloride in the entire catalyst is 2%, then impregnate at 60°C for 3h, dry in an oven at 150°C to constant weight, and then bake at 200°C for 6h;

[0020] (2) Raw material pretreatment: hydrogen sulfide and liquid methanol are mixed and fed at a molar ratio of 10, and preheated and vaporized at 300°C.

[0021] (3) Reaction treatment: Pass the pretreated raw material gas into the reactor to fully contact the catalyst for reaction, adjust the reaction temperature to 320°C, the pressure to 0.5MPa, and the reaction time to 4h to obtain a mixed gas;

[0022] (4) Separation treatment: The mixed product gas is depressurized to 0.2MPa first, and after separation treatment, the target product methyl mercaptan i...

Embodiment 2

[0024] A method for preparing methyl mercaptan, comprising the following steps:

[0025] (1) Preparation of catalyst: Potassium tungstate is loaded onto the carrier by conventional impregnation method -Al 2 o 3 Then add zinc chloride solution so that the mass content of zinc chloride in the entire catalyst is 20%, then impregnate at 20°C for 30h, dry in an oven at 50°C to constant weight, and then bake at 600°C for 1h;

[0026] (2) Raw material pretreatment: Mix and feed hydrogen sulfide and liquid methanol at a molar ratio of 1, preheat and vaporize at 260°C.

[0027] (3) Reaction treatment: Pass the pretreated raw material gas into the reactor to fully contact the catalyst for reaction, adjust the reaction temperature to 390°C, the pressure to 1.0MPa, and the reaction time to 2h to obtain a mixed gas;

[0028] (4) Separation treatment: The mixed product gas is depressurized to 0.5MPa first, and after separation treatment, the target product methyl mercaptan is obtained. ...

Embodiment 3

[0030] A method for preparing methyl mercaptan, comprising the following steps:

[0031] (1) Preparation of catalyst: Potassium tungstate is loaded onto the carrier by conventional impregnation method -Al 2 o 3 Then add zinc chloride solution so that the mass content of zinc chloride in the entire catalyst is 20%, then impregnate at 40°C for 15h, dry in an oven at 105°C to constant weight, and then bake at 400°C for 1h;

[0032] (2) Raw material pretreatment: hydrogen sulfide and liquid methanol are mixed and fed at a molar ratio of 6, preheated and vaporized at 260°C.

[0033] (3) Reaction treatment: Pass the pretreated raw material gas into the reactor to fully contact the catalyst for reaction, adjust the reaction temperature to 350°C, the pressure to 0.8MPa, and the reaction time to 3h to obtain a mixed gas;

[0034] (4) Separation treatment: release the pressure of the mixed product gas to 0.3MPa first, and then obtain the target product methyl mercaptan after separat...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C319/08C07C321/04
Inventor 刘飞曹建新常弈林倩丛轮刚王晓丹
Owner GUIZHOU UNIV
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