Catalytic cracking aid for producing isomerized low-carbon olefins and its preparation method and application

Abstract

The invention relates to a catalytic cracking assistant of highly productive isomeric low-carbon olefin as well as a preparation method and application thereof. The catalytic cracking assistant of the highly productive isomeric low-carbon olefin is prepared from the following components by dry basis base on the total weight of the catalytic cracking assistant: 15 to 45 weight percent of alkali-modified ZSM-5 molecular sieve; 1 to 20 weight percent of mesoporous ZSM-5 molecular sieve; 1 to 10 weight percent of beta-zeolite; 3 to 25 weight percent of P205; 3 to 25 weight percent of inorganic oxide; and the balance of clay. The catalytic cracking assistant of the highly productive isomeric low-carbon olefin can accelerate shape-selective isomerization cracking reaction of gasoline composition of C8 or above in catalytic cracking gasoline, can synchronously improve the productivity of propylene, isobutene and isoamylene, improve propylene content in liquefied gas increment (delta propylene / delta liquefied gas), and co-produce gasoline with high-octane rating.

Description

technical field [0001] The present invention relates to a catalytic cracking additive capable of producing isomeric low-carbon olefins and its preparation method and application; it is applicable to the catalytic cracking of prolific propylene, isobutene and isopentene in a catalytic cracking process, and belongs to the field of petroleum refining process . Background technique [0002] With the rapid development of the petrochemical industry, the demand for propylene continues to grow. In 2013, the domestic demand for propylene was 17.1 million tons / year, and the output was about 14.6 million tons / year, showing a large gap between supply and demand. There are many technological schemes for producing propylene in the petrochemical process, such as traditional naphtha steam cracking method, metathesis reaction technology of ethylene and butene, butene disproportionation reaction (CN1618512A, CN1618515A), propane dehydrogenation technology (CN1073893A), Methanol to propylene...

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Problems solved by technology

[0020] The reason is that from the analysis of the catalytic cracking reaction principle, the secondary cracking of gasoline mainly occurs to increase the production of light olefins. The above-mentioned existing catalyst / auxiliary technology mainly cracks the C5-C7 components in gasoline, resulting in a large amount of C3-C4 components often generate a large amount of liquefied gas while increasing the production of propylene and butene, resulting in a low propylene content (Δpropylene / Δliquefied gas) in the liquefied gas increment, and sometimes reducing the isotropic gas in C5. Pentene

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