Method for quick synthesis of NaY molecular screen

A synthesis method and technology of molecular sieves, applied in the direction of octahedral crystalline aluminosilicate zeolite, crystalline aluminosilicate zeolite, etc., can solve the problems of complicated synthesis process and time waste of NaY molecular sieve, and achieve short synthesis period and simple preparation method Effect

Inactive Publication Date: 2008-01-30
NANJING UNIV OF TECH
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Problems solved by technology

Among them, the synthesis time of the directing agent is about 24 to 48 hours, which makes the synthesis process of NaY molecular sieve more cumbersome; and the synthesis method reported in Materials Letters, although no directing agent is added, but due to the use of variable temperature crystallization, the total cycle is also greater than 72 hours, all of which are a waste of time

Method used

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  • Method for quick synthesis of NaY molecular screen

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Experimental program
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Effect test

Embodiment 1

[0019] During the preparation of the mixture, pay attention to the order of adding various substances, mix 8.0g NaOH and 15g water, add 30g silica sol, 6.7g Al 2 (SO 4 ) 3 ·6H 2 O, add water 15g, make the final molar ratio of mixture be 10Na 2 O:Al 2 o 3 : 15SiO 2 : 300H 2 O. After uniformly stirring at 10°C for 4 hours, put it into a high-pressure reactor, age at room temperature for 12 hours, and finally put it in a 100°C oven for crystallization for 12 hours. After washing and drying, it becomes the original powder of NaY molecular sieve. See accompanying drawing 1 for its XRD diagram, and refer to accompanying drawing 2 for its SEM diagram, and refer to Table 1 for its silicon-aluminum ratio and crystallinity.

Embodiment 2

[0021] Mix 8.0g NaOH and 15g water, add 30g silica sol, 3.4g Al during stirring 2 (SO 4 ) 3 ·6H 2 O, add water 15g, make the final molar ratio of mixture be 20Na 2 O:Al 2 o 3 : 30SiO 2 : 600H 2 O. After stirring evenly at 20°C for 2 hours, put it into a high-pressure reactor, age at room temperature for 14 hours, and finally put it in an oven at 120°C for crystallization for 16 hours. After washing and drying, it becomes the original powder of NaY molecular sieve. The silicon-aluminum ratio and crystallinity are shown in Table 1.

Embodiment 3

[0023] Mix 8.0g NaOH and 15g water, add 30g silica sol, 10.1g Al 2 (SO 4 ) 3 ·6H 2 O, add water 15g, make the final molar ratio of mixture be 6.7Na 2 O:Al 2 o 3 : 10SiO 2 : 200H 2 O. After uniform stirring at 40°C for 6 hours, put it into a high-pressure reactor, age at room temperature for 20 hours, and finally put it in an oven at 100°C for 24 hours of crystallization. After washing and drying, it is the original NaY molecular sieve powder. and crystallinity are shown in Table 1.

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Abstract

The invention discloses a fast synthetic method of NaY zeolite. The method comprises the steps: firstly, silica source, aluminum source, alkali and water is mixed and stirred according to a proportion of 5-20Na2O:1.0Al2O3:10-30SiO2:200-600H2O then is aged, crystallized and post-process so as to get the NaY zeolite. Compared with the traditional synthetic process of NaY, the method does not need preparation directing agent, therefore, the crystallization time is greatly shortened and the shortest time to synthesize NaY zeolite is 20h.

Description

technical field [0001] The invention relates to the technical field of chemical industry, and to be precise, it is a new method for rapidly synthesizing NaY molecular sieves. Background technique [0002] As an important catalyst and adsorption separation agent, NaY molecular sieve is widely used in petroleum hydrocracking, fluid catalytic cracking, benzene alkylation and other reactions. In recent years, the synthesis technology of NaY molecular sieve has also developed rapidly, such as hydrothermal synthesis method, microwave-induced rapid synthesis method, induction heating method and so on. Among them, the hydrothermal synthesis method using silica gel or water glass as a silicon source has practical value. In industry, the production of NaY molecular sieves basically adopts the directing agent method proposed in USP 3,639,099 and USP 4,166,099. The specific content is roughly as follows: firstly, prepare a 2 O:Al 2 o 3 :(14~16)SiO 2 :(280~360)H 2 The directing age...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/24
Inventor 黄和王红娟闫婕汪洋孙鹏李恒
Owner NANJING UNIV OF TECH
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