A kind of ton structure molecular sieve and its preparation method and application
A molecular sieve and alumina technology, applied in the field of molecular sieve materials, can solve the problems of lack of structure of mesopores, weakened acidity of molecular sieves, and reduced interaction, and achieves the effects of high yield, low pour point, and good isomeric pour point depressant ability.
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[0034] The invention also provides a preparation method of the molecular sieve with TON structure. 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 molecular sieve with TON structure described in 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 pr...
Embodiment 1
[0057] (1) Preparation of mother liquor after crystallization
[0058] Take 36.3 grams of SiO containing 40% by weight 2 silica sol, 1.77 g of analytically pure Al 2 (SO 4 ) 3 18H 2 O, 3.94 grams of analytically pure KOH and 8.44 grams of hexamethylenediamine are ready for use. Hexamethylenediamine was mixed with silica sol, KOH and Al 2 (SO 4 ) 3 18H 2 O and 89.4 grams of deionized water were mixed, and then the two solutions were mixed, stirred for 1 hour, then transferred to a reaction kettle, and crystallized at 160° C. for 72 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 ...
Embodiment 2
[0069] The molecular sieve with TON structure was 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. The finished product H-2 of molecular sieve with TON structure was obtained.
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