System and method for jointly producing olefin by alkane catalytic dehydrogenation and light hydrocarbon catalytic cracking

Abstract

The invention relates to a system and method for jointly producing olefin by alkane catalytic dehydrogenation and light hydrocarbon catalytic cracking, which comprise a catalytic dehydrogenation reaction zone and a catalytic cracking reaction zone, and at least two fixed bed reactors filled with catalytic dehydrogenation catalysts are arranged in the catalytic dehydrogenation reaction zone in parallel. At least two fixed bed reactors filled with catalytic cracking catalysts are arranged in the catalytic cracking reaction zone in parallel, at any moment when the system operates, at least one reactor is arranged in each of the two reaction zones for reaction, at least one reactor of the whole reaction system is reheated, and no or only one reactor is used for purging or evacuating / reducing.According to the invention, various alkanes are used as raw materials, alkane catalytic dehydrogenation and light hydrocarbon catalytic cracking processes are ingeniously combined in one reaction system to produce various olefins, and one set of device completes dual functions of olefin preparation through alkane catalytic dehydrogenation and olefin preparation through light hydrocarbon catalyticcracking, so diversification of the raw materials and products is realized, and device investment is reduced.

Description

technical field [0001] The invention relates to a system and method for combined production of olefins by catalytic dehydrogenation of alkanes and catalytic cracking of light hydrocarbons, belonging to the field of petrochemical technology. Background technique [0002] In recent years, with the increasing demand for olefin products, in addition to the traditional ethylene industry, the technology of catalytic dehydrogenation of alkanes to olefins has been greatly developed. An important topic in the development of chemical industry. [0003] Due to the complexity and high investment of the catalytic dehydrogenation of alkanes to olefins and the catalytic cracking of light hydrocarbons to olefins, the scale of their benefits is more than 300,000 tons of olefins per year. According to the yield of olefins, propane and butane 35 10,000 tons / year or more than 500,000 tons / year of C4-C6 components, which will pose a certain pressure on the supply of raw materials for small and ...

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Problems solved by technology

[0004] In terms of catalytic dehydrogenation of alkanes to olefins, Lummus has realized the combined catalytic dehydrogenation of C3 and C4 alkanes (CN201510895549), and realized the diversification of raw materials and products on one set of equipment, but the raw materials are limited to propane and butane and products It is limited to propylene and butene, which cannot effectively solve the problem of insufficient supply of raw materials faced by enterprises in the production of olefins

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