Application of N2O4 as catalyst in dimethyl sulfoxide production

Abstract

The present invention discloses the application of N2O4 as catalyst in producing dimethyl sulfoxide. Liquid N2O4 is pressurized into a gasifier at the pressure of 0.2-0.25 MPa and gasified at 45-65 deg.c to produce NO2 gas, and the produced NO2 gas is made to enter buffering tank at 0.15-0.2 MPa and further flow from the buffering tank to oxidizing reactor at controlled flow rate for serving as catalyst in producing dimethyl sulfoxide. The present invention has the advantages of no waste produced, stable reaction and no explosion accident.

Description

technical field

[0001] The invention relates to the selection of a catalyst for oxidizing dimethyl sulfide to generate dimethyl sulfoxide in the production of dimethyl sulfoxide, especially the application of dinitrogen tetroxide as a catalyst in the production of dimethyl sulfoxide . Background technique

[0002] The production of dimethyl sulfoxide mainly uses methanol (or hydrogen sulfide) and carbon disulfide as raw materials to synthesize dimethyl sulfide, and dimethyl sulfide is then oxidized with oxygen under the action of a catalyst to form dimethyl sulfoxide. The existing technology uses the mixed gas of nitrogen dioxide and nitric oxide generated by the direct reaction of sodium nitrite and concentrated sulfuric acid in a reactor as a catalyst for the oxidation reaction of dimethyl sulfoxide. The mixed gas produces a large amount of acid wastewater during the generation process, which is not conducive to clean production, and is highly cor...