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Process for producing dimethyl disulfide from gas containing hydrogen sulfide

A technology for the production of dimethyl disulfide and gas, which is applied in the preparation of hydrogenated polysulfide/polysulfide, the preparation of organic compounds, organic chemistry, etc. It can solve the problems of incomplete recovery of sulfur and achieve high economic and environmental value , the effect of less by-products

Active Publication Date: 2019-04-23
HUBEI XINGFA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the limitation of chemical balance, the recovery of sulfur is not complete, and the recovered tail gas still needs to be incinerated, absorbed and further desulfurized before being discharged.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Methyl mercaptan synthesis process

[0022] Tail gas containing hydrogen sulfide from a chemical enterprise (component wt%: H 2 S 16.21%, CO 2 79.77%, and the rest is a small amount of hydrocarbons and alcohols, which are transported to the workshop through pipelines. After the tail gas is enriched with hydrogen sulfide by temperature swing adsorption, its composition (wt%) is detected as: H 2 S 67.70%, CO 2 31.52%, H 2 O 0.2%, the rest is a small amount of organic matter. It is used as synthetic raw material gas and sent to the preheater at a flow rate of 1800kg / h. At the same time, industrial methanol (99.9%, wt) is vaporized and sent to the preheater at a flow rate of 1150kg / h. The two are mixed and preheated to 180 After ℃, it enters the synthesis reactor and is synthesized under the conditions of 385 °C and 100kPa (gauge pressure). The composition of the synthesis gas at the outlet of the reactor is detected as: H 2 S 3.1%, CO 2 23.9%, CH 3 SH 57.8%, CH ...

Embodiment 2

[0030] Coal-to-methanol tail gas from an enterprise (component wt%: H 2 S 34.26%, CO 2 61.79%, and the rest is a small amount of hydrocarbons and alcohols, which are transported to the workshop through pipelines. After the sulfur-containing waste gas is washed and dealcoholized with -40°C low-temperature methanol, it is used as raw material gas and sent to the preheater at a flow rate of 3500kg / h, and industrial methanol (99.9%, wt) is vaporized at a flow rate of 1100kg / h After the two are mixed and preheated to 200°C, they enter the synthesis reactor and are synthesized at 395°C and 100kPa (gauge pressure). The composition of the synthesis gas at the outlet of the reactor is detected as: H 2 S 2.06%, CO 2 60.53%, CH 3 SH 33.17%, CH 3 SCH 3 0.49%, H 2 O 3.58%, CH 3 OH 0.15%.

[0031]Synthesis gas is cooled and condensed in multiple stages, and crude methyl mercaptan is obtained after water separation. The subsequent steps of methyl mercaptan purification and liquid-...

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PUM

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Abstract

The invention discloses a process for production of dimethyl disulfide from hydrogen sulfide-containing gas. The process adopts hydrogen sulfide-containing gas, methanol and air as the raw materials, and methyl mercaptan synthesis, methyl mercaptan purification, and methyl mercaptan liquid phase catalytic oxidation processes are carried out to produce dimethyl disulfide, hydrogen sulfide-containing tail gas of petroleum and chemical industries can be effectively utilized, and low value hydrogen sulfide-containing tail gas can be converted into a high value dimethyl disulfide product, therefore the process has high economic and environmental protection value.

Description

technical field [0001] The invention belongs to the technical field of organic chemical industry and relates to the utilization of hydrogen sulfide-containing gas, in particular to a process for producing dimethyl disulfide from hydrogen sulfide-containing gas. 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, petroleum, chemical, rubber and o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C319/24C07C321/14
CPCC07C319/08C07C319/24C07C319/28C07C321/14C07C321/04
Inventor 王杰田云清方兴杨军敖含
Owner HUBEI XINGFA CHEM GRP CO LTD
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