TON structure molecular sieve and preparation method and application thereof
A molecular sieve and mesoporous structure technology, applied in molecular sieves and alkali exchange compounds, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of reducing interaction, lack of mesopore structure, weakening of molecular sieve acidity, etc., and achieving a low pour point. , high yield, good effect of isomeric pour point depressurization
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[0034] The invention also provides a preparation method of the TON structure 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 TON structure molecular sieve of the present invention, the post-processing step in the synthesis process of aluminum-containing molecular sieve needs to be specially treated. The specific steps are as follows:
[0035] (1) Filter the mother liquor after crystallization to form a filter cake with a dry basis content of 5-30%;
[0036] (2) Roasting the filter cake directly to obtain a molecular sieve precursor;
[0037] (3) subjecting the molecular sieve precursor to hydrothermal treatment;
[0038] (4) Filter, wash, and dry the hydrothermal treatment product.
[0039] In step (1), the purpose of filtering the mother liquor after crystallization is to remove the synthetic mother liquor. The present invention specifically lim...
Embodiment 1
[0057] (1) Preparation of mother liquor after crystallization
[0058] Take 36.3 grams containing 40% by weight SiO 2 Silica sol, 1.77 g analytically pure Al 2 (SO 4 ) 3 ·18H 2 O, 3.94 grams of analytically pure KOH and 8.44 grams of hexamethylene diamine for use. Mix hexamethylene diamine with silica sol, and mix 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 and then transferred to the reactor, and crystallized at 160° C. for 72 hours.
[0059] (2) Preparation of filter cake
[0060] Filter the crystallization mother liquor prepared in step (1), count the time when there is no filtrate on the filter cake, and continue the suction filtration for 5 minutes to obtain a filter cake F-1. The dry basis content of the filter cake F-1 is 11.2 %, the silicon oxide / alumina molar ratio is 30.2.
[0061] (3) Preparation of molecular sieve precursor
[0062] The filter cake F-1 was raised from room temperatu...
Embodiment 2
[0069] The TON structure molecular sieve 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 constant for 14 hours. During the heating process, the roasting furnace is a closed roasting furnace, and molecular sieve precursor C-2 is obtained. The finished product H-2 of TON structure molecular sieve was prepared.
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