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Catalyst for producing aromatics from methanol and its preparation method and application

A methanol preparation and catalyst technology, applied in the direction of molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem of low xylene selectivity, improve reaction adaptability, improve acid distribution, and improve selectivity Effect

Active Publication Date: 2019-08-02
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] One of the technical problems to be solved by the present invention is the low selectivity of p-xylene in the methanol-to-aromatics reaction of the single ten-membered ring molecular sieve catalyst in the prior art, and a new methanol-to-aromatics catalyst is provided, which has the ability to The advantage of xylene selectivity is high; The second technical problem to be solved by the present invention is to provide a kind of catalyst preparation method corresponding to solving technical problem one

Method used

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  • Catalyst for producing aromatics from methanol and its preparation method and application
  • Catalyst for producing aromatics from methanol and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) under stirring condition, 14.7g pseudo-boehmite, 16.6g orthophosphoric acid (85%), 5g silica sol (40%) and 60g water are mixed to obtain mixed solution;

[0021] (2) Weigh 20g of hydrogen-type ZSM-5 molecular sieve and add it to the above mixture, stir for 2 hours, heat to 50°C and evaporate to dryness;

[0022] (3) Mix 5g of tetraethylammonium hydroxide, 10g of triethylamine and 35g of water evenly, and add 20g of the solid obtained in step (2), mix evenly, and then transfer to an autogenous pressure crystallization kettle for crystallization at 180°C for 48h ;

[0023] (4) After the crystallization is completed, the crystallization solution is taken out, washed with water, dried, and calcined at 550°C for 4 hours to obtain a core-shell type ZSM-5@SAPO-34 composite molecular sieve;

[0024] (5) Weigh 20g of the above-mentioned core-shell type ZSM-5@SAPO-34 composite molecular sieve, mix it with 20g of pseudoboehmite and 1.0g of turnip powder, weigh an appropriate ...

Embodiment 2

[0027](1) 7.5g pseudo-boehmite, 9g orthophosphoric acid (85%), 2.5g silica sol (40%) and 60g water are mixed uniformly to obtain a mixed solution under stirring conditions;

[0028] (2) Weigh 20g of ZSM-5 molecular sieve and add it to the above mixture, stir for 4 hours, heat to 90°C and evaporate to dryness;

[0029] (3) 5g of tetraethylammonium hydroxide, 10g of morphine and 35g of water were mixed uniformly, and 20g of the solid obtained in step (2) was added, mixed uniformly, and then transferred to an autogenous pressure crystallization kettle for crystallization at 160°C for 72h;

[0030] (4) After the crystallization is completed, the crystallization solution is taken out, washed with water, dried, and calcined at 500°C for 6 hours to obtain a core-shell type ZSM-5@SAPO-34 composite molecular sieve;

[0031] (5) Weigh 20g of the above-mentioned core-shell type ZSM-5@SAPO-34 composite molecular sieve, mix it with 20g of silica sol (40%wt), 1.0g of soluble starch, weigh a...

Embodiment 3-6

[0034] (1) under stirring condition, 15g pseudo-boehmite, 18g orthophosphoric acid (85%), 5g silica sol (40%) and 200g water are mixed to obtain mixed solution;

[0035] (2) Weigh 60g of ZSM-5 molecular sieve and add it to the above mixture, stir for 4 hours, heat to 100°C and evaporate to dryness;

[0036] (3) 20g tetraethylammonium hydroxide, 20g morphine, 20g triethylamine and 140g water are mixed homogeneously, and add the solid that 80g step (2) obtains, mix homogeneously, then transfer to 200 in autogenous pressure crystallization still ℃ crystallization 24h;

[0037] (4) After the crystallization is completed, the crystallization solution is taken out, washed with water, dried, and calcined at 600°C for 2 hours to obtain a core-shell type ZSM-5@SAPO-34 composite molecular sieve;

[0038] (5) Weigh 20g of the core-shell type ZSM-5@SAPO-34 composite molecular sieve prepared above in the example, mix it with 15g of pseudo-boehmite, 5g of fumed silica, and 1g of scallop po...

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Abstract

The invention relates to a catalyst for producing an aromatic hydrocarbon from methanol and a preparation method and application thereof. The catalyst solves the problem that the existing single ten-membered ring molecular sieve-based catalyst has low selectivity to reaction product p-xylene. The catalyst comprises, by weight, a) 25 to 85 parts of a core-shell type composite molecular sieve, b) 0.5 to 10 parts of a metal element and c) 10 to 70 parts of a structural adjuvant. The catalyst and the preparation method well solve the above problem and can be used for industrial production of an aromatic hydrocarbon from methanol.

Description

technical field [0001] The invention relates to a methanol-to-aromatics catalyst and its preparation method and application, in particular to a methanol-to-aromatics catalyst comprising a core-shell composite molecular sieve and its preparation method and application. Background technique [0002] Aromatics (in which benzene, toluene and xylene are called B, T and X respectively, and the three are collectively called BTX) are important basic organic chemical raw materials. Aromatics mainly come from catalytic reforming and steam cracking by-product pyrolysis gasoline (nearly 90%)-petroleum route, and only about 10% from coal route. With the development of the economy, BTX aromatics, especially in the Asia-Pacific region, still maintain a strong market demand. However, with the continuous consumption of petroleum resources and rising prices, the production cost of aromatics using petroleum as raw material has risen sharply. Therefore, in the long run, the conversion of coal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/85C07C1/20C07C15/04C07C15/06C07C15/08
CPCY02P20/52
Inventor 陈希强汪哲明周伟
Owner CHINA PETROLEUM & CHEM CORP
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