Method for preparing dimethyl sulfone from dimethyl sulfoxide

A technology of dimethyl sulfoxide and dimethyl sulfone, which is applied in the field of preparation of dimethyl sulfone, can solve problems such as disease occurrence, poor development, and health disorders, and achieve simple production process, high effective utilization rate, and easy The effect of control

Active Publication Date: 2013-09-11
CHINA PETROLEUM & CHEM CORP +1
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  • Description
  • Claims
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Problems solved by technology

It is contained in the skin, hair, nails, bones, muscles and various organs of the human body. It mainly exists in the ocean and soil in nature and is absorbed as a nutrient during plant growth. Human beings can obtain it from vegetables, fruits, fish, meat, Ingestion from foods such as eggs and milk, once lacking, it will cause health disorders or diseases. It is the main substance for the human body to maintain t

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  • Method for preparing dimethyl sulfone from dimethyl sulfoxide
  • Method for preparing dimethyl sulfone from dimethyl sulfoxide
  • Method for preparing dimethyl sulfone from dimethyl sulfoxide

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[0009] The invention provides a method for preparing dimethyl sulfone, the method comprising, under oxidation reaction conditions, contacting dimethyl sulfoxide with an oxidizing agent, characterized in that the oxidizing agent is a gas containing ozone.

[0010] According to the method of the present invention, an ozone-containing gas is used as an oxidizing agent. Ozone (molecular formula is O 3 , also known as triatomic oxygen, commonly known as "Fu oxygen, super oxygen, active oxygen") is a light blue gas at normal temperature and pressure. The inventors of the present invention found during the research process that using ozone-containing gas as an oxidant to oxidize dimethyl sulfoxide has high selectivity to dimethyl sulfone, and the process is simple and easy, and the operating conditions are mild. Moreover, ozone can be decomposed into oxygen by itself at room temperature, and there will be no disadvantages such as the need to process a solution containing hydrogen pe...

Embodiment 1

[0037] 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 sulfoxide, 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 sulfoxide is 74%; the effective utilization rate of ozone is 76%; the selectivity of dimethyl sulfone is 99%.

Embodiment 2

[0039] 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 sulfoxide, 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 sulfoxide is 53%; the effective utilization rate of ozone is 81%; the selectivity of dimethyl sulfone is 97%.

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Abstract

The invention discloses a method for preparing dimethyl sulfone from dimethyl sulfoxide. The method comprises the following step: contacting dimethyl sulfoxide and an oxidant under the oxidizing reaction conditions. The method is characterized in that the oxidant is ozone-containing gas. According to the method, the selectivity of dimethyl sulfone is high, and especially the effective utilization rate of ozone is greatly improved in the presence of a titanium-containing catalyst.

Description

technical field [0001] The present invention relates to a method for preparing dimethyl sulfone from dimethyl sulfoxide. Background technique [0002] Dimethyl sulfone, alias methyl sulfonylmethane, English name: Dimethyl sulfone, Methyl Sulfonyl Methane (MSM), is a white crystalline powder, easily soluble in ether water, ethanol, benzene, methanol and acetone, slightly soluble in ether. Potassium permanganate cannot be discolored at room temperature, and strong oxidizing agents can oxidize dimethyl sulfone to methanesulfonic acid. Aqueous solution of dimethyl sulfone is neutral. Sublimation occurs in a small amount at 25°C, and the sublimation speed is accelerated at 60°C, so the drying of dimethyl sulfone products is easy to be carried out under low temperature and vacuum. [0003] Dimethyl sulfone is used in industry as a high-temperature solvent and raw material for organic synthesis, as a stationary liquid for gas chromatography, as an analytical reagent, as a food ad...

Claims

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Application Information

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