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Catalyst for catalyzing dimethyl sulfide and hydrogen sulfide to synthesize methyl mercaptan, and preparation method and application thereof

A catalyst and hydrogen sulfide technology, applied in the chemical field, can solve the problems of low conversion efficiency of methyl sulfide and by-product generation, and achieve the effects of convenient industrial production, high-efficiency catalysis, and simple preparation methods

Active Publication Date: 2012-09-12
重庆化医紫光新材料有限责任公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] One of the objectives of the present invention is to provide a catalyst that catalyzes the reaction of methyl sulfide and hydrogen sulfide to generate methyl mercaptan, so as to solve the problem of low conversion efficiency of methyl sulfide and the generation of by-products in the prior art

Method used

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  • Catalyst for catalyzing dimethyl sulfide and hydrogen sulfide to synthesize methyl mercaptan, and preparation method and application thereof
  • Catalyst for catalyzing dimethyl sulfide and hydrogen sulfide to synthesize methyl mercaptan, and preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0029] Weigh 0.78g of phosphotungstic acid (HPW), dissolve it in 18.0ml of distilled water, and stir on an electromagnetic stirrer for 1 hour to obtain a phosphotungstic acid impregnation solution; then weigh 15g of γ-alumina (γ-Al 2 o 3 ) into phosphotungstic acid impregnating solution for 8 hours, filtered, and recovered the filter residue to obtain the catalyst precursor; then the catalyst precursor was dried at 25°C, then baked at 120°C for 8 hours to constant weight, and then dried at 450°C Calcined at lower temperature for 3 hours to obtain a catalyst that catalyzes the synthesis of methyl mercaptan from methyl sulfide and hydrogen sulfide.

[0030] The weight ratio of the catalyst phosphotungstic acid and γ-alumina prepared in this example is 2.5:100, that is, HPW / Al 2 o 3 =2.5 / 100.

[0031] The activity evaluation of the catalyst was carried out on a fixed bed reaction system, the catalyst loading was 2mL, the particle size was 30 mesh, and the reaction raw material...

Embodiment 2

[0033] The preparation method of the catalyst that catalyzes the synthesis of methyl mercaptan from methyl sulfide and hydrogen sulfide is the same as in Example 1, except that 1.56 g of phosphotungstic acid is weighed, the stirring time is 2 hours, the soaking time is 4 hours, and the calcination temperature is 550 °C .

[0034] The weight ratio of the catalyst phosphotungstic acid and γ-alumina prepared in this example is 5:100, that is, HPW / Al 2 o 3 =5 / 100.

[0035] The activity evaluation of the catalyst is the same as in Example 1, except that the molar ratio of the reaction raw material hydrogen sulfide to dimethyl sulfide is 6:1, that is, H 2 S / DMS=6, the particle size is 60 mesh, the reaction temperature is 320°C, the pressure is 0.9MPa, and the space velocity is 1200h -1 Under the condition of catalytic reaction, CH 3 SCH 3 Conversion and CH 3 The SH yield is shown in Table 1.

Embodiment 3

[0037] The preparation method of the catalyst that catalyzes the synthesis of methyl mercaptan from methyl sulfide and hydrogen sulfide is the same as in Example 1, except that 3.12 g of phosphotungstic acid is weighed, the stirring time is 1.5 hours, the immersion time is 6 hours, and the calcination temperature is 500°C .

[0038] The weight ratio of the catalyst phosphotungstic acid and γ-alumina prepared in this example is 10:100, that is, HPW / Al 2 o 3 =10 / 100.

[0039] The activity evaluation of catalyst is the same as embodiment 1, and difference is that reaction raw material hydrogen sulfide and methyl sulfide mol ratio are 1, i.e. H 2 S / DMS=1:1, the particle size is 50 mesh, the reaction temperature is 550°C, the pressure is 0.1MPa, and the space velocity is 5000h -1 Under the condition of catalytic reaction, CH 3 SCH 3 Conversion and CH 3 The SH yield is shown in Table 1.

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Abstract

The invention discloses a catalyst for catalyzing dimethyl sulfide and hydrogen sulfide to synthesize methyl mercaptan. In the catalyst, a catalytic active component is Gamma-alumina, a promoter is phosphotungstic acid, and the mass ratio of the phosphotungstic acid to the Gamma-alumina is (0.02-0.40):1. The invention also discloses a preparation method and application of the catalyst. According to the invention, the preparation method is simple, special equipment is not needed, and the industrial production is convenient; and the prepared catalyst can be used for catalyzing the dimethyl sulfide and the hydrogen sulfide to generate the methyl mercaptan, and has the advantages of high catalytic activity and high selectivity.

Description

technical field [0001] The invention relates to the chemical field, in particular to a catalyst for catalyzing methyl sulfide and hydrogen sulfide to synthesize methyl mercaptan, and also relates to a preparation method and application of the catalyst. Background technique [0002] Methyl mercaptan is an important chemical intermediate for the synthesis of methionine, pharmaceuticals and pesticides. Its traditional manufacturing method is to react methanol and hydrogen sulfide. The catalyst is generally selected from transition metals or alkali metals supported on alumina, such as K 2 WO 4 / Al 2 o 3 . In order to increase the yield of methyl mercaptan, an excessive amount of hydrogen sulfide is generally introduced into the reaction, so the product is mainly methyl mercaptan, accompanied by by-product methyl sulfide (DMS) and other sulfur-containing compounds, such as dimethyl Formation of disulfides. These sulfur-containing by-products can be removed as waste gas duri...

Claims

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Application Information

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IPC IPC(8): B01J27/188C07C321/04C07C319/06
Inventor 杨意泉陈世萍张元华郝影娟姚如杰郑道敏鞠远波
Owner 重庆化医紫光新材料有限责任公司
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