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Method for oxidizing dimethyl sulfide

A technology of dimethyl sulfide and titanium dioxide, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve problems such as environmental pollution by operating conditions, and achieve complex production processes, improved ozone effective utilization, Beneficial to industrial production and application

Active Publication Date: 2013-09-11
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In order to overcome the above-mentioned problems existing in the method for oxidizing dimethyl sulfide in the prior art, the inventor of the present invention has carried out in-depth research and found that using ozone as an oxidizing agent to oxidize dimethyl sulfide can overcome the problems existing in the prior art on the one hand. Defects such as strict operating conditions, polluted environment, etc., can also obtain a satisfactory effective utilization rate of the oxidant, thus completing the present invention

Method used

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  • Method for oxidizing dimethyl sulfide

Examples

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Embodiment 1

[0040] At a temperature of 60°C and a pressure of 0.5 MPa, with ozone (15% by volume, the rest being oxygen) as an oxidant, dimethyl sulfide, ozone and solvent acetone are reacted in a molar ratio of 1:1:1 . The results of the reaction for 2 hours are as follows: the conversion rate of dimethyl sulfide is 44%; the effective utilization rate of ozone is 58%; the selectivity of dimethyl sulfoxide is 88%; the selectivity of dimethyl sulfone is 11%.

Embodiment 2

[0042] At a temperature of 20°C and a pressure of 1.5 MPa, with ozone (30% by volume, the rest being air) as an oxidant, dimethyl sulfide, ozone and solvent acetic acid are reacted in a molar ratio of 1:1:5 . The results of the reaction for 5 hours are as follows: the conversion rate of dimethyl sulfide is 53%; the effective utilization rate of ozone is 61%; the selectivity of dimethyl sulfoxide is 73%; the selectivity of dimethyl sulfone is 25%.

Embodiment 3

[0044] At a temperature of 80°C and a pressure of 0.2 MPa, with ozone (5% by volume, the rest being oxygen) as an oxidant, dimethyl sulfide, ozone and solvent methanol are reacted in a molar ratio of 1:2:10 . The results of the reaction for 2 hours are as follows: the conversion rate of dimethyl sulfide is 57%; the effective utilization rate of ozone is 48%; the selectivity of dimethyl sulfoxide is 78%; the selectivity of dimethyl sulfone is 21%.

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Abstract

The invention discloses a method for oxidizing dimethyl sulfide, which comprises the step of contacting dimethyl sulfide with an oxidizing agent under oxidation reaction conditions and is characterized in that the oxidizing agent is gas containing ozone. The method disclosed by the invention is free from any inhibitor or initiator in feed gas and has high selectivity and higher effective ozone utilization rate; particularly, the effective ozone utilization rate is greatly increased in the presence of a titanium-containing catalyst; furthermore, the method disclosed by the invention is simple in process and easy for control and is beneficial to industrial production and application; in addition, compared with the traditional method, the problems of being complex in traditional production process, corrosive in equipment, harmful for discharging and the like are overcome.

Description

technical field [0001] The invention relates to a method for oxidizing dimethyl sulfide. Background technique [0002] Dimethyl sulfoxide (DMSO) is a sulfur-containing organic compound, English Dimethyl sulfoxide, molecular formula (CH 3 ) 2 SO, a colorless and transparent liquid at room temperature, has the characteristics of high polarity, high hygroscopicity, flammability, and high boiling point aprotic. Soluble in water, ethanol, acetone, ether and chloroform, it is a highly polar inert solvent, widely used as a solvent and reaction reagent, has a high selective extraction ability, and can be used as an extraction solvent for the separation of alkanes and aromatics. Used for the extraction of aromatic hydrocarbons and butadiene, especially as a processing solvent and spinning solvent in the polymerization of acrylonitrile, as a solvent for polyurethane synthesis and spinning, as a polyamide, fluorochloroaniline, polyimide and polysulfone resin synthetic solvents. In ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C317/04C07C315/02
Inventor 林民史春风朱斌
Owner CHINA PETROLEUM & CHEM CORP
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