Beta molecular sieve, preparation method, and application thereof
A technology of molecular sieve and alumina, which is applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of molecular sieves such as weakened acidity, reduced interaction, and lack of mesopore structure, so as to achieve low pour point, Good heterogeneous pour point depressing ability and high yield
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[0034] The invention also provides a preparation method of the Beta molecular sieve. Generally, the preparation of aluminum-containing molecular sieves can be divided into steps such as gelation, crystallization, and post-treatment. In order to obtain the Beta molecular sieve of the present invention, the post-treatment step in the synthesis process of the aluminum-containing molecular sieve needs to be specially treated, and the specific steps are as follows:
[0035] (1) filtering the crystallized mother liquor to form a filter cake with a dry basis content of 5-30%;
[0036] (2) directly roasting the filter cake to obtain a molecular sieve precursor;
[0037] (3) subjecting the molecular sieve precursor to hydrothermal treatment;
[0038] (4) Filtrating, washing and drying the hydrothermally treated product.
[0039] In step (1), the purpose of filtering the crystallized mother liquor is to remove the synthesis mother liquor. The present invention specifically limits th...
Embodiment 1
[0057] (1) Preparation of mother liquor after crystallization
[0058] Take 6.05 mL of white carbon black, 0.51 g of analytically pure aluminum sec-butoxide, and 18.4 mL of tetraethylammonium hydroxide (40% by weight) for use. Mix 15 grams of deionized water with tetraethylammonium hydroxide, aluminum sec-butoxide and 37 grams of deionized water, then add white carbon black, stir for 1 hour, then transfer to a reaction kettle, and crystallize at 140°C for 120 hours.
[0059] (2) Preparation of filter cake
[0060] Filter the mother liquor after crystallization prepared in the operation (1), and continue suction filtration for 5 minutes when there is no filtrate on the filter cake, and obtain the filter cake F-1, which has a dry basis content of 11.2 %, the silica / alumina molar ratio is 30.2.
[0061] (3) Preparation of molecular sieve precursor
[0062] The filter cake F-1 was raised from room temperature to 450° C. at a heating rate of 25° C. / min, and kept at a constant te...
Embodiment 2
[0069] Beta molecular sieves were prepared according to the method of Example 1, except that in step (3), the filter cake F-1 was raised from room temperature to 350° C. at a heating rate of 5° C. / min, and kept at a constant temperature for 14 hours. During the heating process, the roasting furnace is a closed roasting furnace to obtain the molecular sieve precursor C-2. Beta molecular sieve finished product H-2 was obtained.
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