Catalyst for heavy oil catalytic cracking, preparation method thereof, and method for catalytic cracking of heavy oil

Abstract

The invention relates to a heavy oil catalytic cracking catalyst and its preparation method and a heavy oil catalytic cracking method. The heavy oil catalytic cracking catalyst comprises 10-40% by dry base weight of small crystal grain gas phase ultrastable high-silica rare earth Y-type zeolite, 10-60% by dry base weight of clay and 13-60% of by oxide weight of an inorganic oxide, the inorganic oxide contains at least one active alumina, the average diameter of the alumina crystal grains is in a range of 0.1-0.8 micrometers, a lattice constant is in a range of 24.5-24.6 angstroms and a silica-alumina ratio is in a range of 7-10. The small crystal grain gas phase ultrastable high-silica rare earth Y-type zeolite comprises, by weight, 6-16% of a rare earth oxide and less than 2% of sodium oxide. The Y-type zeolite is prepared from small crystal grain Y-type zeolite through gas phase ultrastable treatment, washing and rare earth ion exchange. The average aperture of the active alumina is in a range of 5-25nm. The catalytic cracking catalyst has good stability and good catalytic cracking coke selectivity and can produce a gasoline product with a high gasoline octane number and good quality.

Description

technical field [0001] The invention relates to a catalyst for catalytic cracking of heavy oil, a preparation method thereof, and a method for catalytic cracking of heavy oil with the catalyst. Background technique [0002] Catalytic cracking (FCC) is an important secondary processing process of crude oil and occupies a pivotal position in the oil refining industry. In the catalytic cracking process, heavy fractions such as vacuum distillate oil or residues of heavier components react in the presence of catalysts to convert them into high value-added products such as liquefied gas, gasoline, and diesel. The performance of the catalyst in the catalytic cracking process determines the distribution of catalytic cracking products and the economic benefit of the catalytic unit. Due to the depletion of petroleum resources and the large demand for light oil products in the market, it is very necessary to further improve the performance of catalytic cracking catalysts and convert h...

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Problems solved by technology

[0016] The purpose of the present invention is to solve the problems of poor stability of existing heavy oil catalytic cracking catalysts, poor selectivity of coke in heavy oil catalytic cracking reactions and low gasoline octane product (being the product of octane number and gasoline yield) of gasoline products , providing heavy oil catalytic cracking catalyst and its preparation method and heavy oil catalytic cracking method

Among them, the octane number of catalytic cracking gasoline is directly related to the quality and price of gasoline. Generally, the increase of gasoline production by catalytic cracking faces the problem of a decrease in gasoline octane number, and the problem of gasoline yield decline when increasing the gasoline octane number

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