Method for synthesizing titanium silicalite molecular sieve

Abstract

The invention relates to a method for synthesizing a titanium silicalite molecular sieve, which comprises the following steps: mixing, stirring and hydrolyzing a titanium-containing compound, a TPAOH aqueous solution and a silicon raw material, and putting the obtained mixture into a high-pressure reaction kettle to heat for reacting; and mixing an obtained reaction mixture with solid silica gel, drying the obtained object so as to obtain a solid mixture, carrying out heating reaction on the solid mixture in an airtight reaction kettle, after the solid mixture is cooled, taking out and then roasting the solid mixture so as to remove organic matters, so that a TS-1 molecular sieve is obtained. In the technical scheme above, by reducing the application amount of a guiding agent tetrapropylammonium hydroxide (TPAOH), taking inorganic silicon oxide for replacing organosilicone as a raw material, and taking a solid-phase solvent-free crystallization method, the steps of filtering, washing and the like are omitted, thereby simplifying the synthesis operation of the TS-1 molecular sieve and reducing the synthetic cost.

Description

Technical field [0001] The invention relates to the field of molecular sieve synthesis, in particular to a method for synthesizing titanium silicon molecular sieve. Background technique [0002] Titanium silicate molecular sieve (TS-1) as a catalyst has the characteristics of mild reaction conditions, process safety, and good atomic economy in the catalytic reaction process. However, compared with other aluminosilicate zeolites, the synthesis process of TS-1 molecular sieve is complicated and the raw materials used are more expensive. It has the following disadvantages: [0003] 1. In the traditional synthesis process of titanium silicate molecular sieve, the template agent tetrapropylammonium hydroxide used in the synthesis of molecular sieve is used in a large amount, the molar ratio of tetrapropylammonium hydroxide (TPAOH) to silica is over 0.35, and its synthesis cost accounts for the total More than 90% of the cost of consumables; [0004] 2. The silicon and titanium raw mater...

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Problems solved by technology

[0003] 1. In the traditional process of synthesizing titanium-silicon molecular sieves, the amount of template tetrapropylammonium hydroxide used in the synthesis of molecular sieves is large, and the molar ratio of tetrapropylammonium hydroxide (TPAOH) to silicon oxide is above 0.35, and its synthesis cost accounts for the total More than 90% of the cost of consumables;

[0004] 2. The silicon and titanium raw materials used for synthesis are organic silicon and organic titanium sources, and the cost of raw materials is relatively high;

[0005] 3. The synthesis process is complicated and requires water as a solvent. After the synthesis is completed, the desired product needs to be filtered and washed. The use of water solvent not only increases the cost, but also reduces the output of a single reactor, and also increases The process of recycling and filtering, thus increasing the cost