A method of co-producing dimethyl sulfoxide and acetone

Abstract

A method of co-producing dimethyl sulfoxide and acetone is disclosed. The method includes bringing dimethyl sulfide and isopropanol into contact with a titanium silicalite molecular sieve in the presence of oxygen to obtain a mixture containing dimethyl sulfoxide and acetone. By the method, a high dimethyl sulfide conversion ratio and high dimethyl sulfoxide selectivity can be achieved and the acetone can be produced as a by-product. Raw materials used in the method are environmental friendly, and environment pollutants produced by the method is less, so that the method is beneficial to environment protection. The method can be free of solvents, the raw materials can be directly used without the need of preparing into solutions, and effective throughput of a device is not reduced. The method is simple and convenient in process, easy to operate and suitable for large-scale application.

Description

technical field [0001] The present invention relates to a method for simultaneously producing dimethyl sulfoxide and acetone. Background technique [0002] Dimethyl sulfoxide (DMSO) is a sulfur-containing organic compound. It is a colorless and transparent liquid at room temperature. It has the characteristics of high polarity, high hygroscopicity, flammability, and high boiling point aprotic. Dimethyl sulfoxide is soluble in water, ethanol, acetone, ether and chloroform, is a highly polar inert solvent, widely used as a solvent and reaction reagent, for example, as a processing solvent and spinning solvent in acrylonitrile polymerization, as Polyurethane synthesis solvent and spinning solvent, as a synthesis solvent of polyamide, fluorochloroaniline, polyimide and polysulfone. Moreover, dimethyl sulfoxide has high selective extraction ability and can be used as an extraction solvent for the separation of alkanes and aromatic hydrocarbons. For example, dimethyl sulfoxide ca...

AI Technical Summary

Problems solved by technology

[0004] The disadvantages of the nitric acid oxidation method are that the reaction is not easy to control, the equipment is severely corroded, and the environment is polluted.

Ozone oxidation method has the problem of low conversion rate of dimethyl sulfide

Anodizing is not suitable for large-scale implementation

Nitrogen dioxide oxidation law has the problem of environmental pollution

But, as the most commonly used oxidant in the peroxide oxidation method, hydrogen peroxide is usually provided in the form of hydrogen peroxide, and its commercial concentration is generally between 20-50% by weight, so a large amount of water will inevitably be introduced in the reaction system, reducing The effective processing capacity of the device

In the actual operation process, hydrogen peroxide (hydrogen peroxide) is generally used and produced on the spot, so the production equipment using hydrogen peroxide (hydrogen peroxide) as the oxidant is generally equipped with a hydrogen peroxide (hydrogen peroxide) production unit, which increases the construction cost of the device and running costs

In addition, hydrogen peroxide may decompose during the reaction process, thus reducing the effective utilization rate of hydrogen peroxide and further increasing the operating cost of the device

Images