Productive propylene fluidized catalytic cracking (FCC) catalyst and preparation method thereof

Abstract

The invention relates to a preparation method of a productive propylene fluidized catalytic cracking (FCC) catalyst. The preparation method comprises the following steps of: mixing and pulping 530 parts by weight of H-ZSM-5 molecular sieve, 20 to 40 parts by weight of USY molecular sieve, 40 to 70 parts by weight of natural clay and 5 to 20 parts by weight of a binder for 30 to 60 minutes to obtain a mixture, wherein the adding amount of the binder is counted on the basis of silica; standing the pulped mixture for 1 to 4 hours, continuously pulping for 10 to 30 minutes, naturally drying, and drying in a drying oven at 100 to 120 DEG C for 4 to 8 hours; placing the dried product into a muffle furnace, heating to 500 to 650 DEG C, roasting for 2 to 6 hours and naturally cooling to prepare the productive propylene FCC catalyst of 100 to 200 meshes. The productive propylene FCC catalyst prepared by the method provided by the invention has the advantages of high conversion rate of heavy oil, high propylene selectivity and low yield of dry gas and coke. In addition, the preparation method of the catalyst is simple and low in cost and has good industrial application prospect.

Description

technical field [0001] The invention relates to a catalytic cracking (FCC) catalyst and a preparation method thereof, and belongs to the technical field of catalyst preparation for petroleum hydrogenation catalysis. Background technique [0002] Propylene is an important basic organic chemical raw material. It is mainly used to synthesize its derivatives such as polypropylene, acrylonitrile, propylene oxide, acrylic acid, butanol, acrolein, and cumene. In recent years, affected by the increase in demand for polypropylene, the society's demand for propylene has become increasingly strong, and the world will face the problem of shortage of propylene. Therefore, the structure of the petrochemical industry has also been adjusted to increase the production of propylene. [0003] At present, 66% of the world's propylene comes from hydrocarbon steam cracking units, 32% comes from refinery FCC units, and a small amount is obtained from propane dehydrogenation and other olefin conver...

AI Technical Summary

Problems solved by technology

However, the ZSM-5 molecular sieve additive currently used in the FCC process generally suffers from the problem of low propylene selectivity

However, in the FCC catalysts or co-catalysts for increasing the production of propylene disclosed in the prior art, only attention is paid to the modulation of the acidity and hydrothermal stability of the molecular sieve, and no attention is paid to the influence of the pore structure of the molecular sieve on the product selectivity in the cracking process. So far, there have been no reports on the application of hierarchical pore structure ZSM-5 molecular sieves to the FCC process to increase the yield of propylene, especially the selectivity of propylene

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