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Method for preparing dimethyl sulfoxide from dimethyl sulfide

A technology of dimethyl sulfide and dimethyl sulfoxide, which is applied in the chemical industry and can solve problems such as hidden dangers and safety in gas-phase oxidation reactions

Inactive Publication Date: 2018-02-16
辽宁省轻工设计院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Dimethyl sulfide has a low boiling point, and its vapor and oxygen can form explosive mixtures. Industrial gas-phase oxidation reactions have potential safety hazards

Method used

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  • Method for preparing dimethyl sulfoxide from dimethyl sulfide

Examples

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Effect test

Embodiment 1

[0023] In this example, reagents were weighed to prepare a mixed solution with a mass ratio of dimethyl sulfide: dimethyl sulfoxide: catalyst of 1:4:0.01. at 0.12m 3 The flow rate of / h is passed into ozone, and the ozone concentration is controlled at 0.075 kg / m 3 above. Keep the reaction temperature at 5°C and continue the reaction for 30 min. Detection and calculation: the conversion rate of dimethyl sulfide is 92.51%, and the yield is 94.25%.

Embodiment 2

[0025] In this example, reagents were weighed to prepare a mixed solution with a mass ratio of dimethyl sulfide: dimethyl sulfoxide: catalyst of 1:4:0.05. at 0.12m 3 Ozone is fed at a flow rate of / h, and the ozone concentration is controlled above 0.075 kg / m3. Keep the reaction temperature at 5°C and continue the reaction for 30 min. Detection and calculation: the conversion rate of dimethyl sulfide is 98.94%, and the yield is 96.03%.

Embodiment 3

[0027] In this embodiment, reagents were weighed to prepare a mixed solution with a mass ratio of dimethyl sulfide: dimethyl sulfoxide: catalyst of 1:1.5:0.05. at 0.18m 3 The flow rate of / h is passed into ozone, and the ozone concentration is controlled at 0.075 kg / m 3 above. Keep the reaction temperature at 5°C and continue the reaction for 30 min. Detection and calculation: the conversion rate of dimethyl sulfide is 85.91%, and the yield is 90.77%.

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Abstract

The invention discloses a method for preparing dimethyl sulfoxide from dimethyl sulfide, and relates to methods for preparing dimethyl sulfoxide. Oxidization reaction is carried out under the pressures ranging from -0.1 Mpa to 0.5 Mpa at the temperatures ranging from 0 DEG C to 70 DEG C. The method has the advantages that the dimethyl sulfide is dissolved in solvents, the chance of forming explosive mixtures by dimethyl sulfide steam and oxygen can be prevented in the presence of the solvents, and uniform mixed solution can be formed; the mixed solution is filled with high-concentration ozoneunder the condition of the presence of catalysts; the ozone is used as an oxidizing agent, and bubble reaction is carried out in a vertical-pipe reactor with a large length-diameter ratio; oxidized dimethyl sulfide is converted into the dimethyl sulfoxide in the procedure, the pressures and the temperatures of reaction systems are controlled, the stage for oxidizing the dimethyl sulfide to obtainsulfoxide can be controlled by added selective catalysts, the reaction conversion rate is 95-98%, and the yield can reach 90-96%; efficient, complete, environment-friendly and high-selectivity technologies can be created for preparing the sulfoxide from the dimethyl sulfide by means of oxidization by the method.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a method for preparing dimethyl sulfoxide from dimethyl sulfide. Background technique [0002] Sulfoxide is an important intermediate in organic synthesis of fine chemicals, medicines, and pesticides, and has a wide range of uses. At the same time, sulfoxide is a new type of extraction agent developed in the 1960s. The sulfoxide molecule contains a semi-polar sulfur-oxygen group, which can effectively form a coordination complex or solvate with metal ions. . Therefore, sulfoxide can extract precious metals such as gold, silver, and platinum in hydrochloric acid and sulfuric acid media, and can also extract rare earth elements such as uranium and thorium. What is more valuable is that it can selectively extract molybdenum from sodium tungstate solution to achieve the purpose of deep purification of sodium tungstate solution. Because sulfoxide has the advan...

Claims

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Application Information

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IPC IPC(8): C07C315/02C07C317/04B01F13/02B01J19/00B01J19/24B01F33/40
CPCB01J19/0053B01J19/24C07C315/02B01F33/406
Inventor 张怀有田心瑶刘慧男
Owner 辽宁省轻工设计院有限公司
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