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Technique for preparing middle raw material for producing methyl mercaptan and/or dimethyl sulfide by natural gas

A technology of dimethyl sulfide and natural gas, applied in the chemical industry, can solve problems such as relatively large production constraints, unsuitable for long-distance transportation, and highly toxic hydrogen sulfide, and achieve high raw material utilization, raw material transportation costs and safety risks Reduced effect

Inactive Publication Date: 2017-08-04
HUBEI XINGFA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The industrial production of dimethyl sulfide generally uses methanol and carbon disulfide or methanol and hydrogen sulfide as raw materials. Hydrogen sulfide is highly toxic, and carbon disulfide is a low-boiling flammable and explosive liquid, which is not suitable for long-distance transportation. Therefore, production is restricted by raw materials. larger

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The second-class natural gas from the natural gas pipeline is preheated to 200°C-400°C by steam, and the granular or powder sulfur is melted by steam or electric heating in the sulfur melting tank and heated to 130°C-140°C, respectively, into the tubular Heating furnace, the material is in a state of intense fluidization in the tubular heating furnace, and the liquid sulfur is vaporized and fully mixed with natural gas. After mixing, the temperature of the material is about 180°C to 200°C, and the mixed material is heated to 600°C to 700°C in the furnace, and then enters the adiabatic reactor, and reacts under normal pressure and adiabatic conditions to generate hydrogen sulfide and carbon disulfide:

[0024] CH 4 + 4S → CS 2 + 2H 2 S

[0025] The mixed gas obtained from the sulfidation process of natural gas is mainly hydrogen sulfide and carbon disulfide (called sulfide products). The sulfide products are passed through the waste heat boiler to produce 0.40MPa st...

Embodiment 2

[0031] A process for preparing intermediate raw materials for the production of methyl mercaptan and / or dimethyl sulfide by using natural gas, comprising the following steps:

[0032] Preheat the three types of natural gas and sulfur. The temperature of natural gas is 200°C. The sulfur is heated in the sulfur melting tank to melt it, and then heated to 130°C. The two are added into the Mix in a tubular heating furnace and heat to 600°C to 650°C, then enter the adiabatic reactor for atmospheric pressure adiabatic reaction to obtain a mixed gas containing hydrogen sulfide and carbon disulfide; cool the reacted mixed gas to below 200°C After the gas-liquid separation, the liquid sulfur is separated, and the mixed gas after the liquid sulfur is separated enters the elemental sulfur removal tower, and the trace elemental sulfur carried in it is further removed, and the removed elemental sulfur is returned to the sulfur melting tank for reuse, and the elemental sulfur removal The re...

Embodiment 3

[0034] A process for preparing intermediate raw materials for the production of methyl mercaptan and / or dimethyl sulfide by using natural gas, comprising the following steps:

[0035] Preheat the second type of natural gas and sulfur. The temperature of natural gas is 400°C. The sulfur is heated in the sulfur melting tank to melt it, and then heated to 140°C. The two are added separately according to the molar ratio of CH4:S=1:4.2 Mix in a tubular heating furnace, heat to 650°C to 700°C, and then enter an adiabatic reactor for atmospheric pressure adiabatic reaction to obtain a mixed gas containing hydrogen sulfide and carbon disulfide; cool the reacted mixed gas to 150 After ℃, the gas-liquid is separated, and the liquid sulfur is separated. The mixed gas after the liquid sulfur is separated enters the elemental sulfur removal tower, and the trace elemental sulfur carried in it is further removed. The removed elemental sulfur is returned to the sulfur melting tank for reuse, a...

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PUM

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Abstract

The invention discloses a technique for preparing middle raw material for producing methyl mercaptan and / or dimethyl sulfide by natural gas. The technique includes steps of after preheating, mixing natural gas and sulphur in a device and heating to 600-700 DEG C, and preforming partial chemical reaction; reacting in a adiabatic reactor to obtain a mixed gas containing hydrogen sulfide and carbon disulfide; cooling the reacted mixed gas to 120-200 DEG C and performing gas and fluid separation, wherein the obtained gas is the middle raw material for producing methyl mercaptan and / or dimethyl sulfide. Through the natural gas sulfuration technique, the sulfuretted hydrogen, carbon disulfide and other middle raw materials for producing methyl mercaptan and / or dimethyl sulfide are obtained; thus the methyl mercaptan and dimethyl sulfide is further produced; the technique is featured by being low in raw material cost, convenient to convey and adaptable to domestic natural gas with high sulfur content.

Description

technical field [0001] The invention belongs to the technical field of chemical industry and relates to organic chemical industry, in particular to a process for preparing intermediate raw materials for producing methyl mercaptan and / or dimethyl sulfide by using natural gas. Background technique [0002] Methylmercaptan is a colorless gas with an unpleasant odour. Insoluble in water, soluble in organic solvents such as ethanol and ether. Raw materials and catalysts for organic synthesis and pesticides. In industry, it is often produced by the action of methanol and hydrogen sulfide, or by the reaction of sodium hydrogen sulfide and dimethyl sulfate. Hydrogen sulfide is highly toxic and inconvenient for long-distance transportation, and its production is greatly restricted by raw materials; the dimethyl sulfate-sodium hydrosulfide process produces a large amount of sodium sulfate as a by-product, which is difficult to handle. [0003] Dimethyl sulfide is a colorless, volat...

Claims

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Application Information

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IPC IPC(8): C01B17/16C01B32/75C07C319/08C07C321/04C07C319/14C07C321/14
CPCC01B17/161C07C319/08C07C319/14C07C321/04C07C321/14
Inventor 王杰刘永杰田云清龙真明王刚敖含陈伟
Owner HUBEI XINGFA CHEM GRP CO LTD
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