Catalytic cracking additive for increasing yield rates of propylene and isopentene as well as preparation method and application thereof

Abstract

The invention relates to a catalytic cracking additive for increasing yield rates of propylene and isopentene as well as a preparation method and application thereof. The catalytic cracking additive for the increasing yield rates of propylene and isopentene is prepared from the following components in percentage by weight based on the dry basis: 15 to 45 wt% of alkaline-modified ZSM-5 molecular sieve, 1 to 20 wt% of USY molecular sieve, 1 to 10 wt% of beta-zeolite, 3 to 25 wt% of P2O5 (phosphorus pentoxide), 3 to 25 wt% of inorganic oxide, and the balance of clay. The catalytic cracking additive for increasing the yield rates of propylene and isopentene has the advantages that the selective heterogenous cracking reaction of C8 or above gasoline components in gasoline can be promoted to catalyze and crack, the yield rates of propylene and isopentene are synchronously increased, the content of propylene (delta propylene / delta liquefied gas) in the liquefied gas increment is increased, and the gasoline with high octane number is jointly produced.

Description

technical field [0001] The present invention relates to a kind of catalytic cracking auxiliary agent that can produce more propylene and isopentene and its preparation method and application, which is suitable for the catalytic cracking of more produced propylene and isopentene in the 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 (such as CN1073893A) , met...

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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 in order 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 low propylene content (Δpropylene / Δliquefied gas) in the liquefied gas increment, and sometimes reduce the content of C5 olefins. Isoamylene

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