ZSM-48 molecular sieve and preparation method and application thereof
A technology of molecular sieve and alumina, which is applied in the field of molecular sieve materials, can solve the problems of mesopores without structure, reduce interaction, and weaken the acidity of molecular sieves, and achieve the effects of high yield, low pour point, and good heterogeneous pour point depressing ability
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[0034] The invention also provides a preparation method of ZSM-48 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 ZSM-48 molecular sieve of the present invention, the post-treatment 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% by weight;
[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 limits the d...
Embodiment 1
[0057] (1) Preparation of mother liquor after crystallization
[0058] Take 45 grams of white carbon black and 1.25 grams of analytically pure Al 2 (SO 4 ) 3 ·18H 2 O, 1.88 grams of analytically pure NaOH and 39.3 grams of hexamethylene diamine for use. Mix hexamethylene diamine with white carbon black and 200 grams of deionized water, and mix NaOH and Al 2 (SO 4 ) 3 ·18H 2 O and 272 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 wa...
Embodiment 2
[0069] The ZSM-48 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 at a constant temperature 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 ZSM-48 molecular sieve was prepared.
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