Catalytic cracking catalyst for cracking coker gas oil and increasing production of liquefied gas and preparation method thereof

Abstract

The invention provides a catalytic cracking catalyst for cracking coker gas oil and increasing production of liquefied gas and a preparation method thereof. The catalyst is prepared from 10-50 wt% a Ymolecular sieve, 2-50 wt% of an MFI structure molecular sieve, 15-60 wt% of clay, 8-30 wt% of pseudo-boehmite and 3-20 wt% of a binder. The preparation method comprises the following steps that (1) arare earth, phosphorus and magnesium modified Y type molecular sieve is prepared, specifically, a NaY molecular sieve is subjected to ammonium salt and rare earth salt exchange and then is sequentially modified by phosphorus and magnesium, wherein the step is characterized in that phosphorus modification is carried out before magnesium modification; (2) the catalyst is formed, specifically, water, the Y type molecular sieve, the MFI structure molecular sieve, the clay, the pseudo-boehmite and the binder are mixed and are subjected to spray drying; and (3) the catalyst is modified, specifically, catalyst solid particles are roasted by water vapor, the pH value is adjusted by using an acidic substance, and then filtering and drying are carried out. The catalyst has the characteristics of being high in coker gas oil cracking capacity and high in liquefied gas yield.

Description

technical field [0001] The invention relates to a catalyst for catalytic cracking and a preparation method thereof, in particular to a catalyst for cracking coking wax oil to produce more liquefied gas and a preparation method thereof. Background technique [0002] Delayed coking is currently an important residue upgrading process. With crude oil quality deteriorating and prices depressed, delayed coking has become more popular in current refining schemes due to the flexibility in processing feedstock. Delayed coking processing capacity has increased dramatically in China, reaching 110 million tons in 2010. Coker gas oil (CGO) is the main product of the delayed coking process, accounting for 20-30% by weight of the coking product, and the utilization rate of coker gas oil directly affects the economic benefit of the refinery. [0003] In foreign countries, coker wax oil is used as raw material for catalytic cracking after hydrotreating. For example, in the United States, ...

AI Technical Summary

Problems solved by technology

Due to the large molecular size of the basic compound, when the catalyst prepared by the above-mentioned patent method reacts with the basic nitrogen compound, it will inevitably prevent other hydrocarbon molecules from contacting the acidic center of the catalyst, and the above-mentioned patent does not consider the aromatic hydrocarbons and non-alkali in coking wax oil. Effect of Nitrogen Compounds on Catalytic Cracking

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