Catalyst for catalytic hydrodealkylation of aromatic hydrocarbons and method for its preparation and use

By using composite metal-modified alumina catalysts and segmented hydrogen feeding and raw material cooling methods, the problems of catalyst bed inhomogeneity and temperature rise in catalytic hydrodealkylation reactions were solved, thus improving the conversion rate of aromatics and the selectivity of benzene, and enhancing the safety of the equipment and heat exchangers.

CN117839691BActive Publication Date: 2026-07-24CHINA PETROLEUM & CHEMICAL CORP +1
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Patent Information

Application Number
CN202211229935.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-10-09
Publication Date
2026-07-24
Estimated Expiration
2042-10-09

AI Technical Summary

Technical Problem

Existing aromatic catalytic hydrogenation dealkylation catalysts suffer from problems such as uneven hydrogen-to-hydrogen ratio in the catalyst bed, increased reaction temperature, and poor operational safety of the equipment and heat exchangers, which affect the conversion rate of aromatics and the selectivity of benzene.

Method used

A composite metal-modified alumina catalyst, containing alumina, Cr, Co, Ni, Rh and metal elements such as La, Ce, and Re, is used. By using a segmented hydrogen feed and reactor outlet cooling method, the catalyst composition and reaction process are optimized, the reaction temperature rise is reduced, and the reaction uniformity is improved.

Benefits of technology

It significantly reduces reaction temperature rise, improves aromatic conversion and benzene selectivity, enhances the operational safety of the unit and heat exchanger, and solves the problem of uneven hydrogen-to-hydrogen ratio in the catalyst bed.

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Abstract

The application discloses an aromatic hydrocarbon catalytic dealkylation catalyst, a preparation method and application thereof. The catalyst composition comprises alumina, a first modified metal, a second modified metal and a rare earth metal element. The first modified metal is Cr, the second modified metal comprises at least one of Co, Ni and Rh, and the rare earth metal element comprises at least one of La, Ce and Re. The application solves the problem of non-uniformity of the hydrogen hydrocarbon ratio of the reaction catalyst bed layer caused by the reaction, and also achieves the purposes of reducing the reaction temperature rise, improving the safety of the operation of the device and the heat exchanger, and improving the selectivity of the target product and the aromatic hydrocarbon conversion rate.
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