Direct Synthesis Method of High Si-Al Ratio Beta Molecular Sieve
A technology with high silicon-aluminum ratio and synthesis method, applied in the direction of crystalline aluminosilicate zeolite, etc., can solve the problems of environmental harmful fluoride ion limitation, unsuitable for industrial production, etc., and achieve excellent hydrothermal stability, low cost, and product yield. high rate effect
Active Publication Date: 2020-01-14
SHANDONG QILU HUAXIN HIGH TECH
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Problems solved by technology
Patents (US 5554356; US 20100254894A1; CN200810246983.1) and others disclose the synthesis method of all-silicon Beta molecular sieves, but there are restrictions on the use of fluoride ions that are harmful to the environment or the use of special and rare templates.
Other published patents also have some unsuitable industrial production problems
Method used
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Embodiment 1～10
[0033] Mix water, aluminum source, alkali source, templating agent, and mineralizer according to the proportions and raw material types listed in Table 1 and Table 2, and stir vigorously at room temperature (around 20°C) for 60 minutes to form a homogeneous gel, then Add dispersant and silicone source and continue to mix well. After the gel was stirred evenly, it was transferred to a hydrothermal crystallization kettle for crystallization. Crystallization in two stages: first at T 1 Lower crystallization t 1 hours, then at T 2 Lower crystallization t 2 Hour. After the crystallization is complete, the product is cooled rapidly, and the filter cake is separated by suction filtration, washed repeatedly with deionized water until neutral, dried at 120°C for 24 hours, and roasted at 550°C for 4 hours to remove the template agent to obtain the original powder of Beta molecular sieve . The original powder and 1.0mol / L NH 4 + The ion solution was exchanged at 80°C for 1 hour a...
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Abstract
The invention relates to a direct synthesis method of a high-aluminum-to-silicon-ratio Beta molecular sieve, and belongs to the field of crystalline silicon aluminate molecular sieve synthesis. The method comprises the following steps of (a) uniformly mixing water, an aluminum source, an alkali source, a template agent and a mineralizer to form homogeneous gel; then, adding dispersants and an organic silicon source; after the sufficient stirring, transferring the materials into a crystallization kettle to be crystallized; (b) performing crystallization on products prepared in the step (a); after the complete crystallization, fast cooling the products; performing suction filtering separation, washing, exchange, drying and roasting, obtaining the Beta molecular sieve. The mineralizer and thedispersants are used for controlling the organic silicon source hydrolysis speed; the goal of synthesizing the high-aluminum-to-silicon-ratio Beta molecular sieve by a one-step method is achieved; the characteristics of high product yield, simple process and low cost are realized.
Description
technical field [0001] The invention relates to a method for directly synthesizing Beta molecular sieves with a high silicon-aluminum ratio, and belongs to the field of synthesizing crystalline aluminosilicate molecular sieves. Background technique [0002] Beta molecular sieves are molecular sieves with a twelve-membered ring three-dimensional pore structure. Due to its high hydrothermal stability, good shape selectivity and acidity, Beta molecular sieves can be used in hydroisomerization, hydrocracking, cumene from benzene and propylene, alkylation of aromatics, disproportionation of toluene, etc. showed excellent catalytic performance (CN 106430230A). [0003] High-silicon Beta molecular sieves have more obvious hydrophobicity, and have better hydrothermal stability in catalysis, so the catalytic life is longer than that of conventional Beta molecular sieves. In order to obtain high-silicon Beta molecular sieves, people often adopt the method of acid washing to remove a...
Claims
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IPC IPC(8): C01B39/04
CPCC01B39/04C01P2002/72C01P2004/03
Inventor 王龙许振甫明曰信刘环昌陈文勇彭立
Owner SHANDONG QILU HUAXIN HIGH TECH