Method for molding tin-silicon molecular sieve, molded tin-silicon molecular sieve prepared by method and method for preparing dimethyl sulfoxide

A technology of tin-silicon molecular sieve and molding method, which is applied in the direction of molecular sieve catalyst, preparation of organic compounds, chemical instruments and methods, etc., can solve the problems of unsuitability for large-scale production and high cost of anodizing method, and is suitable for large-scale production and easy to use. Controlled, high crushing strength effect

Active Publication Date: 2015-04-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0007] Dimethyl sulfoxide can also be produced from dimethyl sulfide by anodic oxidation, but the cost of anodic oxidation is high and it is not suitable for large-scale production

Method used

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  • Method for molding tin-silicon molecular sieve, molded tin-silicon molecular sieve prepared by method and method for preparing dimethyl sulfoxide
  • Method for molding tin-silicon molecular sieve, molded tin-silicon molecular sieve prepared by method and method for preparing dimethyl sulfoxide
  • Method for molding tin-silicon molecular sieve, molded tin-silicon molecular sieve prepared by method and method for preparing dimethyl sulfoxide

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preparation example Construction

[0064] According to the preparation method of dimethyl sulfoxide of the present invention, from the perspective of further improving the degree of mixing between the reactants in the reaction system, enhancing diffusion and more conveniently adjusting the intensity of the reaction, the contact is preferably at in the presence of at least one solvent. The kind of the solvent is not particularly limited. Generally, the solvent can be selected from water, C 1 -C 6 Alcohol, C 3 -C 8 Ketones and C 2 -C 6 of nitrile. Specific examples of the solvent may include, but are not limited to: water, methanol, ethanol, n-propanol, isopropanol, t-butanol, isobutanol, acetone, methyl ethyl ketone, and acetonitrile. Preferably, the solvent is selected from water and C 1 -C 6 alcohol. More preferably, the solvent is methanol and / or water.

[0065] The amount of the solvent used is not particularly limited, and can be conventionally selected. Generally, the mass ratio of solvent to d...

preparation example 1

[0105] The tin-silicon molecular sieve Sn-β was prepared according to the method described in NATURE, 2001, volume 412, pages 423-425. The specific preparation process is as follows.

[0106] At 25°C, add 30g tetraethylammonium hydroxide (TEOS) to 32.99g tetraethylammonium hydroxide (TEAOH, 35% by weight) aqueous solution, stir and mix and perform hydrolysis, and add tin tetrachloride aqueous solution after 90 minutes (formed by dissolving 0.43g of tin tetrachloride pentahydrate in 2.75g of water), stirring continuously until a clear solution is obtained. Add 3.2g of hydrofluoric acid (48% by weight) to the above clear solution to obtain a paste-like mixture, then add the seed crystal suspension (formed by suspending 0.36g of dealuminated β molecular sieve in 1.75g ​​of water) and stir well. The resulting mixture was transferred into a stainless steel reactor with a polytetrafluoroethylene liner, and was dynamically crystallized at 140° C. for 480 hours. The crystallized pro...

preparation example 2

[0109] Prepare tin-silicon molecular sieve SnS-1 according to the method for preparing titanium-silicon molecular sieve described in Zeolites, 1992, volume 12, pages 943-950, the difference is that tetrabutyl titanate is replaced by tin tetrachloride pentahydrate , the specific preparation process is as follows.

[0110] At room temperature (20°C), 22.5 grams of tetraethyl orthosilicate, 7.0 grams of tetrapropylammonium hydroxide and 59.8 grams of distilled water were stirred and reacted at normal pressure and 60°C for 1.0 hour to obtain tetraethyl orthosilicate hydrolysis solution. With vigorous stirring, a tin tetrachloride solution (1.1 g of tin tetrachloride pentahydrate was dissolved in 5.0 g of anhydrous isopropanol) was slowly added to the hydrolysis solution, and the resulting mixture was stirred at 75°C for 3 Hours, a clear transparent colloid was obtained. The colloid was placed in a stainless steel sealed reaction kettle, and kept at a constant temperature of 170°...

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Abstract

The invention provides a method for molding a tin-silicon molecular sieve and the molded tin-silicon molecular sieve. The method comprises the following steps: carrying out hydro-thermal treatment on a tin-silicon molecular sieve in an aqueous mixture in a closed container; molding slurry obtained in hydro-thermal treatment to obtain a molded body, and roasting, wherein the aqueous mixture is from a crystallized mother liquor containing silicon molecular sieve, and the crystallized mother liquor contains at least one alkaline template agent. The molded tin-silicon molecular sieve prepared by the molding method has a relatively high catalytic activity and high crushing strength. The invention further provides a method for preparing dimethyl sulfoxide. In the method, the molded tin-silicon molecular sieve is used as a catalyst to obtain high conversion rate of dimethyl sulfide, high effective utilization of an oxidant and high selectivity of dimethyl sulfoxide.

Description

technical field [0001] The invention relates to a molding method of tin-silicon molecular sieve and a shaped tin-silicon molecular sieve obtained by the method, and further relates to a method for preparing dimethyl sulfoxide using the shaped tin-silicon molecular sieve as a catalyst. 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, 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 polymerizatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J35/02B01J37/10B01J29/06C07C317/04C07C315/02
Inventor 史春风朱斌林民
Owner CHINA PETROLEUM & CHEM CORP
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