A method for rapidly synthesizing ti-mww molecular sieves by rotation by seed crystal method
A technology of molecular sieve and seed crystal method, applied in the direction of crystalline aluminosilicate zeolite, etc., can solve the problems that the catalytic activity of Ti-MWW molecular sieve needs to be improved, is unfavorable for industrial production and application, and increases production cost, and is beneficial to industrial production and application. , The effect of short synthesis time and energy saving
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Embodiment 1
[0029] Embodiment 1: a kind of method that the seed method rotates and synthesizes Ti-MWW molecular sieve rapidly, comprises the following steps:
[0030] 1) Mix the raw materials to make a reaction gel: firstly, the raw materials are according to the molar composition ratio: titanium source: silicon source: boron source: organic amine: water = 0.04: 1.0: 0.67: 1.5: 25.0, weighed for later use, and the organic amine is added to In water, after stirring for 0.5 hours, then add titanium source and boron source in turn and stir evenly, then add silicon source and stir thoroughly to obtain a reaction gel, wherein the titanium source is n-butyl titanate, and the silicon source is Silica, the boron source is boric acid, and the organic amine is piperidine;
[0031] 2) adding the seed crystal to the reaction gel obtained in step 1), the amount of the seed crystal added is 1% of the mass of the reaction gel, and the reaction gel containing the seed crystal is obtained, wherein the see...
Embodiment 2～10
[0036] The implementation process is the same as in Example 1 except for the following differences. Table 1 shows the raw material components and their formulations for preparing the reaction gel, and Table 2 shows the process conditions for preparing Ti-MWW molecular sieves.
[0037] Table 1
[0038]
[0039] Table 2
[0040]
Embodiment 11
[0041] Embodiment 11: Effect example
[0042] The catalytic activity of the synthesized Ti-MWW molecular sieves was evaluated by the epoxidation reaction of allyl chloride. The catalytic reaction conditions are: 0.2 grams of catalyst, 3.9 grams of acetone, 2.295 grams of allyl chloride, and 3.73 grams of hydrogen peroxide (27.3% in mass concentration). The specific process is that the catalyst, solvent and reactant are added into the double-necked flask in sequence, and the hydrogen peroxide is divided into four parts evenly under the condition of stirring, and then added into the reactor in turn within 30 minutes, and reacted at 60 ° C for 8 hours , and the results are shown in Table 3.
[0043] table 3
[0044] serial number
[0045] As can be seen from Table 3, the Ti-MWW molecular sieves obtained according to the method of rotating and rapidly synthesizing Ti-MWW molecular sieves provided by the present invention have excellent performance in the epoxidation re...
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