Modified ZSM-5 catalyst for alkylation reaction and its preparation method and application and preparation method of p-xylene

A ZSM-5, alkylation reaction technology, applied in the field of alkylation catalysts, can solve the problems of reducing the activity of molecular sieves, blocking the original pores, and low product selectivity.
CN107930677BActive Publication Date: 2020-10-27CHNA ENERGY INVESTMENT CORP LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHNA ENERGY INVESTMENT CORP LTD
Publication Date
2020-10-27

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Abstract

The invention discloses a modified ZSM-5 catalyst for alkylation reactions, a preparation method and applications thereof, and a p-xylene preparation method. The modified ZSM-5 catalyst comprises a ZSM-5 molecular sieve core and an all-silicon molecular sieve shell formed on the outer surface of the core, wherein the pore channels of the shell are communicated to the pore channels of the core so as not to cover the pore channels of the ZSM-5 molecular sieve core by the all-silicon molecular sieve shell, the all-silicon molecular sieve shell has shape-selective effects on alkylation reactions and does not have reaction activity, a molar ratio of Si to Al in the ZSM-5 molecular sieve core is 100-500:1, and the all-silicon molecular sieve shell is formed by reducing the concentrations of a silicon source and a template agent through epitaxial growth. According to the present invention, the catalyst can operate at a high toluene concentration and high space velocity to obtain the high yield of p-xylene, and is suitable for large-scale production and industrial scale application.
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Description

technical field

[0001] The invention relates to the field of alkylation catalysts, in particular to a modified ZSM-5 catalyst used in an alkylation reaction, a preparation method and application thereof, and a preparation method of p-xylene. Background technique

[0002] P-xylene (p-xylene, PX) is an important chemical raw material commonly used in industry, and most of p-xylene is used to produce terephthalic acid, which is then used to produce chemical products such as polyester fiber. The demand for p-xylene has been growing rapidly in recent years. In 2015, the domestic demand for PX was 24 million tons, while the national production capacity was only about 11 million tons. In recent years, the import volume has exceeded 50%. Although new PX projects have been put into production all over the country in recent years, the annual gap is still more than 5 million tons.

[0003] At present, there are three production processes of p-xylene worldwide, disproportionation of to...

Claims

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