Alkylbenzene, and process and system for preparing alkylbenzene by using coking byproducts

By using coking by-products to reform the CO and H2 and alkylation reaction with coking benzene, the energy security and carbon emission problems in the existing alkyl benzene production process are solved, and the clean and low-carbon production of high value-added alkyl benzene is achieved.

CN119707616APending Publication Date: 2025-03-28TAIYUAN UNIVERSITY OF TECHNOLOGY
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Patent Information

Application Number
CN202411893236.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-20
Publication Date
2025-03-28

AI Technical Summary

Technical Problem

The existing alkyl benzene production process relies on petrochemicals, which leads to energy security issues. The utilization rate of raw materials in the coal chemical route is low and the selectivity decreases, and the hydrogen supplement process leads to severe carbon emissions.

Method used

By using the coking by-products coking oven gas and coking benzene, combined with CO2 in the coking oven exhaust gas, the reforming reaction is carried out to generate CO and H2, and then alkylation reaction with the coking benzene, a high value-added alkyl benzene is prepared.

Benefits of technology

The synthesis of high value-added alkyl benzene has been achieved, which avoids high investment caused by different production sources of raw materials, and has achieved a clean low-carbon process chain of coal chemical industry by reducing carbon emissions.

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Abstract

The invention discloses alkylbenzene, and a process and a system for preparing alkylbenzene by using coking byproducts, and the process comprises the following steps: purifying the byproduct coke-oven gas generated by coking to obtain purified coke-oven gas, and then entering a reformer to reform with carbon dioxide; reformed gas obtained by reforming is pressurized by a compressor and then is mixed with another coking byproduct coking benzene to enter an alkylation reactor for reaction; a product is divided into a gas phase and a liquid phase through a gas-liquid separator, dry gas is separated from the gas phase and mixed with clean coke-oven gas through a circulating compressor for cyclic utilization, benzene, methylbenzene, xylene and heavy aromatic hydrocarbon components are sequentially separated from the liquid phase according to the boiling point, and the methylbenzene, the xylene and the heavy aromatic hydrocarbon components are alkylbenzene. According to the process provided by the invention, the alkylbenzene can be completely synthesized from the coking by-product, the dependence on petroleum resources is avoided, the production equipment investment and carbon emission are reduced, and the efficient utilization of resources is realized.
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