Method for oxidizing thioether
A technology of thioether oxidation and thioether, which is applied in the fields of chemical instruments and methods, organic chemistry, molecular sieve catalysts, etc., can solve the problems affecting the stability and safety of reactor operation, the increase of catalyst bed pressure drop, and the increase of system energy consumption. Advanced problems, to achieve the effect of prolonging the stable running time, suppressing the increase of pressure drop, and reducing the energy consumption of the system
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preparation Embodiment 1
[0108] In this preparation example, a vanadium-free titanium-silicon molecular sieve was prepared by hydrothermal crystallization.
[0109] Mix ethyl orthosilicate, titanium isopropoxide and tetrapropyl ammonium hydroxide, and add an appropriate amount of distilled water to stir and mix. The molar ratio of ethyl orthosilicate: titanium isopropoxide: tetrapropyl ammonium hydroxide: water is 100:3:20:2000, among them, ethyl orthosilicate with SiO 2 In terms of titanium isopropoxide as TiO 2 hydrolyze at normal pressure and 60°C for 1 hour, then stir at 75°C for 3 hours, then put the mixed solution into a stainless steel sealed reaction kettle, and place it at a constant temperature of 170°C for 72 hours to obtain a mixture of crystallized products; The mixture was filtered, and the solid phase was collected, washed with water, and dried at 110° C. for 60 minutes to obtain a molecular sieve powder. The raw molecular sieve powder was roasted in an air atmosphere at 550°C for 3 h...
preparation Embodiment 2
[0111] In this preparation example, a vanadium-titanium-silicon molecular sieve was prepared by a hydrothermal crystallization method.
[0112] Mix ethyl orthosilicate, ammonium metavanadate, titanium isopropoxide and tetrapropyl ammonium hydroxide, and add an appropriate amount of distilled water to stir and mix, ethyl orthosilicate: titanium isopropoxide: ammonium metavanadate: tetrapropyl The molar ratio of ammonium hydroxide: water is 100:3:1:20:2000, wherein, ethyl orthosilicate is SiO 2 In terms of titanium isopropoxide as TiO 2 In terms of ammonium metavanadate in V 2 o 5 Meter; hydrolyze at normal pressure and 60°C for 1 hour, then stir at 75°C for 3 hours, then put the mixed solution into a stainless steel sealed reaction kettle, and place it at a constant temperature of 170°C for 72 hours to obtain a mixture of crystallized products; filter the mixture , the solid phase was collected, washed with water, and dried at 110° C. for 60 minutes to obtain a molecular sie...
preparation Embodiment 3
[0114] In this preparation example, a vanadium-silicon molecular sieve was prepared by a hydrothermal crystallization method.
[0115] Mix ethyl orthosilicate, ammonium metavanadate and tetrapropyl ammonium hydroxide, and add an appropriate amount of distilled water to stir and mix. The molar ratio of ethyl orthosilicate: ammonium metavanadate: tetrapropyl ammonium hydroxide: water is 100:1:20:2000, among them, ethyl orthosilicate with SiO 2 In terms of ammonium metavanadate in V 2 o 5 Meter; hydrolyze at normal pressure and 60°C for 1 hour, then stir at 75°C for 3 hours, then put the mixed solution into a stainless steel sealed reaction kettle, and place it at a constant temperature of 170°C for 72 hours to obtain a mixture of crystallized products; filter the mixture , the solid phase was collected, washed with water, and dried at 110° C. for 60 minutes to obtain a molecular sieve powder. The original powder of molecular sieve was roasted in an air atmosphere at 550°C for...
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