Preparation method of cracking catalyst containing ultrastable molecular sieve

Abstract

The invention discloses a preparation method of a cracking catalyst containing ultrastable molecular sieve, comprising the followings steps: (1) mixing certain amount of a host material, hydrochloric acid and deionized water according to formula requirements for pulping, adding NaY molecular sieve and mixing evenly, then feeding obtained material to a spray drying system to dry for shaping, thus obtaining catalyst powder; and (2) mixing the catalyst powder with a salt solution to be exchanged and stirring evenly, exchanging for at least 1h, cooling, washing and drying, roasting at the temperature of 500-700 DEG C with 100% of water vapor to obtain the cracking catalyst utilizing ultrastable Y type molecular sieve as active component. By adopting the method provided by the invention, the size of original grain in catalyst can be effectively kept, thus improving the dispersibility and crystallinity of the molecular sieve, effectively reducing runoff material, lowering salt usage during the modification process of the molecular sieve, lowering production cost and protecting environment.

Description

technical field [0001] The invention relates to a preparation method of a hydrocarbon fluidized cracking catalyst containing an ultra-stable molecular sieve. Background technique [0002] Heavy oil catalytic cracking is an important petroleum processing technology, in which cracking catalyst plays a pivotal role. The current cracking catalyst is generally prepared by mixing the matrix and the active component, beating, spray drying and molding to obtain the product. The so-called matrix materials include kaolin, alumina, silica sol, aluminum sol, sodium metaaluminate, aluminum sulfate, water glass, sepiolite, and some other clays. The substrate of the cracking catalyst is generally composed of two or more than two kinds of the above-mentioned materials mixed uniformly according to a certain proportion. The so-called active components generally refer to Y-type molecular sieves, type-selective molecular sieves and molecular sieves modified by other elements. Y-type molecula...

AI Technical Summary

Problems solved by technology

In addition, during the modification process, the activity of molecular sieves will decrease due to excessive local acidity or local overheating during calcination, and the agglomeration of molecular sieves will also cause uneven distribution of cations (such as RE) in molecular sieves during the exchange process, affecting product quality. stability

Third, since the particle size of molecular sieves is basically less than 10 microns, there will be a certain amount of loss of molecular sieves in the traditional modification process, especially in the process of roasting and drying.