Molecular sieve catalyst, preparation method thereof, and application in methanol and toluene side chain alkylation reaction

An alkylation reaction and catalyst technology, applied in the field of molecular sieve catalysts and their preparation, can solve the problems of low catalyst life and low selectivity to styrene, achieve simple preparation process, improve technical economy and popularization possibility, and high Effect of Styrene Selectivity and Yield

Active Publication Date: 2021-09-07
NEIJIANG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings of the molecular sieve catalysts in the prior art for methanol and toluene side chain alkylation reactions such as low selectivity to styrene and low catalyst life, and to provide a catalyst with better performance and applied to methanol and toluene side chain alkanes. Molecular sieve catalyst for alkylation reaction and its preparation method and application

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  • Molecular sieve catalyst, preparation method thereof, and application in methanol and toluene side chain alkylation reaction

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preparation example Construction

[0025] According to an exemplary embodiment of the present invention, the preparation method of the molecular sieve catalyst includes the following steps.

[0026] Step A:

[0027] adding water source to the silicon source for dilution, then adding template agent, aluminum source and sodium source successively and stirring evenly after each addition to obtain a liquid mixture;

[0028] In this step, SiO 2 Calculated, the quality of the silicon source is 100%, and the silicon source can be one or more of sodium silicate, silica sol, methyl orthosilicate and ethyl orthosilicate. Take Al 2 o 3 Calculated, the mass of the aluminum source is SiO in the silicon source 2 56.56-84.84% of the mass, and the aluminum source can be one or more of aluminum isopropoxide, sodium metaaluminate and aluminum nitrate. Take Na 2 In terms of O, the mass of the sodium source is SiO in the silicon source 2 1 to 3 times the mass, and the sodium source can be one or a mixture of sodium hydroxid...

Embodiment 1

[0050] The raw material components of the molecular sieve catalyst of the present embodiment are (the unit is mass, if there is no special instruction, the following are all equivalent):

[0051] SiO 2 In total, weigh 100 parts of silica sol; 2 o 3 In total, 56.56 parts of aluminum isopropoxide, as Na 2 In terms of O, 200 parts of sodium hydroxide; in terms of H 2 In terms of O, 1200 parts of deionized water; 40 parts of template agent ethylenediamine, 1 part of trimethylsilyl chloride, alkali metal ion exchange solution is 0.5mol / L of KNO 3 solution.

[0052] The molecular sieve catalyst of the present embodiment is prepared by the following method from the above-mentioned component raw materials:

[0053] A) According to the above component ratio, add deionized water to the silica sol to dissolve and dilute, then add ethylenediamine, dissolve and stir evenly, then add aluminum isopropoxide dropwise, and finally add sodium hydroxide dropwise;

[0054] B) Stir the obtain...

Embodiment 2

[0060] The raw material components of the molecular sieve catalyst of the present embodiment are:

[0061] SiO 2 In total, weigh 100 parts of ethyl orthosilicate; 2 o 3 In total, 56.56 parts of aluminum isopropoxide; 2 In terms of O, 100 parts of sodium hydroxide; in terms of H 2 O meter, deionized water is 1600 parts; template agent butanediamine 40 parts, dimethyldimethoxysilane 20 parts, alkali metal ion exchange solution is 2mol / L CsNO 3 solution.

[0062] The molecular sieve catalyst of the present embodiment is prepared by the following method from the above-mentioned component raw materials:

[0063] A) According to the above component ratio, add deionized water to tetraethyl orthosilicate to dissolve and dilute, then add butanediamine, dissolve and stir evenly, then add aluminum isopropoxide dropwise, and finally add sodium hydroxide dropwise;

[0064] B) Stir the obtained liquid mixture evenly, age at room temperature for 6 hours, add dimethyldimethoxysilane and...

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Abstract

The invention discloses a molecular sieve catalyst and its preparation method, and its application in the side-chain alkylation reaction of methanol and toluene. Specifically, water is added to the silicon source for dilution, and then a template agent, an aluminum source and a sodium source are added successively and each time Stir evenly after adding to obtain a liquid mixture; add a silylating agent after aging at room temperature, stir evenly and carry out a crystallization reaction under mild and constant stirring conditions, wash and filter after the reaction, and dry the obtained solid before roasting to obtain Molecular sieve catalyst precursor; the molecular sieve catalyst precursor is placed in an alkali metal salt solution for alkali metal ion exchange, and the resulting exchanged sample is filtered, dried and roasted to obtain a molecular sieve catalyst. The specific application is to use the molecular sieve catalyst on the side of methanol and toluene Styrene is produced in chain alkylation reactions. The invention changes the physical and chemical properties of the molecular sieve by optimizing the preparation conditions, and finally effectively improves the conversion rate of methanol, the selectivity and yield of styrene.

Description

technical field [0001] The invention relates to the technical field of molecular sieve catalyst preparation and modification, and more specifically, relates to a molecular sieve catalyst, a preparation method thereof, and an application in side-chain alkylation reactions of methanol and toluene. Background technique [0002] In the contemporary chemical industry, styrene, as an important raw material for organic synthesis, is widely used in the production of polystyrene, styrene-butadiene rubber, ion exchange resins, medicines and dyes, etc. The output of its series of chemical materials is second only to that of the world's high-yield polymers. The output ranks in the forefront of the synthetic resin production in the world. The traditional styrene production process mostly uses benzene and ethylene to produce ethylbenzene, and then catalyzes dehydrogenation to produce styrene products. This process has long routes, high catalyst bed temperature (600°C-660°C), high energy c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C15/46B01J29/08C07C15/073C07C2/86
CPCB01J29/082C07C2/864C07C15/46C07C15/073
Inventor 谭亚南阮尚全吴远彬
Owner NEIJIANG NORMAL UNIV
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