Device and method for increasing yield of low-carbon olefins

Abstract

The invention discloses a device and method for increasing the yield of low-carbon olefins, and belongs to the technical field of petroleum refining. According to the equipment, a first regenerator and a second regenerator which are connected in series are arranged, the first regenerator is connected with a catalytic cracking device, and the second regenerator is connected with an alkane dehydrogenation device, so that alkane dehydrogenation and catalytic cracking reaction are coupled, and the equipment is used for carrying out high-yield low-carbon olefin operation; the heat transfer problem of a fixed bed and a moving bed can be solved, continuous reaction regeneration is realized, the overall activity and the reaction efficiency of the alkane dehydrogenation catalyst are improved, the heat extraction cost and the heat supply cost are saved, and the process heat efficiency is remarkably improved; the alkane dehydrogenation reaction is maintained within the optimal reaction temperature by utilizing redundant heat of the catalytic cracking reaction, the reaction efficiency of alkane dehydrogenation is remarkably improved, in addition, alkane produced by the device can be recycled, the low-carbon olefin yield of the device is remarkably improved, meanwhile, hydrogen with the additional value higher than that of olefin is increased, and remarkable economic benefits are achieved.

Description

Technical field [0001] The present invention relates to the field of petroleum refining, and in particular, to a plurality of low-carbon olefins. Background technique [0002] Ethylene, propylene, butylene, low carbon olefins such as olefins are important raw materials in the petrochemical industry. At present, the production of low-carbon olefins mainly includes four types: (1) steam cleavage, the raw material is mainly light stone and diesel and ethane, sometimes doped with propane / LPG, diesel, decompression wax oil, hydrocracking tail oil, etc. (2) Refinery gas byproduce, mainly including catalytic cracking or catalytic cracking, etc., low-carbon olefins, the raw materials are mainly wax oil or residue, and the catalyst is generally Y-type zeolite or ZSM-5 zeolite or both. Complex. (3) Methanol olefin technology, catalyst uses SAPO-34 or ZSM-5 zeolite. (4) Propane, butane dehydrogenation technology. [0003] In the prior art, the refinery gas byproduction and methanol olefin...

AI Technical Summary

Problems solved by technology

Because, the main component of the carrier of Pt-based catalyst and Cr-based catalyst is Al 2 o 3 Metal oxides such as metal oxides are poor conductors of heat. Whether the catalyst is in a fixed or flowing state, its heat transfer performance is not ideal

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