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
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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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