Thioether oxidation method

Abstract

The invention discloses a thioether oxidation method which comprises the following steps: (1-1) performing a contact reaction on cumene and oxygen under certain conditions so that the content of cumene hydroperoxide in the reaction mixture obtained by the contact reaction is 1 wt% or above; optional (1-2) mixing the reaction mixture obtained by the step (1-1) with an inorganic acid; and (2) under the conditions sufficient to oxidize thioethers, performing a contact reaction on a raw material mixture (containing the reaction mixture obtained in the step (1-1) and thioethers) and a titanium silicon molecular sieve, or performing a contact reaction a raw material mixture (containing the mixture obtained in the step (1-2) and thioethers) and a titanium silicon molecular sieve. The method is beneficial to enhancing the effective treatment capacity of devices, and can obtain higher thioether conversion rate and target oxidation product selectivity. According to the method, a thioether oxidation reaction device is directly installed at a material outlet end of the existing cumene oxidation device, so the method is easy to implement.

Description

technical field [0001] The present invention relates to a kind of sulfide oxidation method. Background technique [0002] Sulfoxides are important sulfur-containing compounds. For example, dimethyl sulfoxide (DMSO) is a sulfur-containing organic compound. It is a colorless and transparent liquid at room temperature. properties such as protons. Dimethyl sulfoxide is soluble in water, ethanol, acetone, ether and chloroform, is a highly polar inert solvent, and is widely used as a solvent and reaction reagent. Moreover, dimethyl sulfoxide has a high selective extraction ability and can be used as an extraction solvent for the separation of alkanes and aromatics. For example: dimethyl sulfoxide can be used for the extraction of aromatics or butadiene. In the polymerization reaction, it is used as a processing solvent and spinning solvent, as a synthetic solvent and spinning solvent of polyurethane, and as a synthetic solvent of polyamide, fluorochloroaniline, polyimide and pol...

AI Technical Summary

Problems solved by technology

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 oxidizing agent 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, although Water can act as a solvent, but the amount of thioether dissolved in water as a reactant is still limited. In order to increase the amount of thioether dissolved, the amount of water used is large or an organic solvent needs to be used in conjunction, which inevitably reduces the capacity of the device. Effective processing capacity

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