A kind of method for preparing dimethyl sulfoxide
A technology of dimethyl sulfoxide and dimethyl sulfide, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve the problem of large consumption, increased production cost of dimethyl sulfoxide, high price of oxidant, etc. problems, to achieve high effective utilization, improve effective utilization, and good stability
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
preparation example Construction
[0036] In a preferred embodiment of the present invention, the preparation method of the catalyst comprises: under hydrolysis reaction conditions, at least one organosilicon compound capable of hydrolysis reaction and at least one water-soluble base are contacted with water, and the The mixture obtained by contacting is mixed with the titanium-silicon molecular sieve, and the obtained mixture containing the titanium-silicon molecular sieve is successively shaped and roasted. The catalyst obtained according to this embodiment not only has higher strength and thus is more wear-resistant and has a higher resistance to crushing, the bed containing the catalyst has a higher resistance to collapse; Methyl sulfide conversion and dimethyl sulfoxide selectivity.
[0037] In this preferred embodiment, the amount of the organosilicon compound, the water-soluble base and the titanium-silicon molecular sieve should be used to form the titanium-silicon molecular sieve, and the amount of wat...
Embodiment 1
[0083] (1) Mix titanium-silicon molecular sieve TS-1 with silica sol (the content of silicon dioxide is 30% by weight) and water evenly, wherein, the weight ratio of titanium-silicon molecular sieve TS-1, silica sol and water in terms of silica It is 1:0.2:1.5. The obtained mixture was granulated by rolling balls, and the obtained wet granules were calcined at 550° C. for 5 hours, thereby obtaining a catalyst having an average particle diameter of 200 μm. Wherein, in the catalyst, the content of the titanium silicon molecular sieve is 80% by weight.
[0084] (2) Loading the catalyst prepared in step (1) into a fixed-bed reactor to form a catalyst bed, wherein the number of the catalyst bed is 1 layer.
[0085] Dimethyl sulfide, hydrogen peroxide and methanol are combined to form a liquid mixture. Aqueous ammonia (concentration: 25% by weight) was added to the liquid mixture to adjust the pH of the liquid mixture to 6.5. Then, the liquid mixture is sent into a fixed-bed reac...
Embodiment 2
[0088] Dimethyl sulfoxide was prepared by the same method as in Example 1, except that the titanium-silicon molecular sieve TS-1 in Example 1 was replaced with an equal amount of hollow titanium-silicon molecular sieve. The calculated conversion of dimethyl sulfide, effective utilization of oxidant and selectivity of dimethyl sulfoxide are listed in Table 1.
PUM
| Property | Measurement | Unit |
|---|---|---|
| length | aaaaa | aaaaa |
| adsorption capacity | aaaaa | aaaaa |
| particle size | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More