Method for preparing rear earth Y type molecular sieve

Abstract

The invention provides a preparation method of a rear earth Y type molecular sieve. The method comprises the following steps: firstly mixing a NaY molecular sieve, a rare earth chloride solution and deionized water to perform ion exchange, adding an oxalic acid solution in exchange fluid to enable unexchanged rear earth to be completely precipitated, adding rare earth chloride in a filter cake after filtration, so as to perform ion exchange with the deionized water, obtaining a filter cake and reuse filtrate through filtering, and performing muffle roasting on the filter cake, so as to obtaina product REY; completely or partly replacing the rare earth chloride solution with the reuse filtrate, and performing the ion exchange process of the next batch of NaY molecular sieve. The method canrecycle rear earth, ensures that the use ratio of rear earth almost reach 100 percent under the condition that equipment is not added, reduces the production cost, efficiently utilizes nonrenewable rear earth resources, can obtain REY with high content of rear earth, has the advantages of high activity and heat stability; in addition, the heavy oil fluid catalytic cracking activity of the molecular sieve is obviously improved after the formed REY is cleaned through channels of oxalic acid.

Description

technical field [0001] The invention relates to a method for preparing rare earth Y-type molecular sieves. Background technique [0002] Y-type molecular sieves play an extremely important role in fluid catalytic cracking (FCC) catalysts, and have attracted the attention of researchers for many years. Y-type molecular sieves are modified with rare earths to obtain REY, REHY and REUSY. REY was developed first. It is generally A Y-type modified molecular sieve obtained by using NaY-type molecular sieves for two rare earth exchanges and two roastings. Since the advent of the molecular sieve, it has been widely used in the petroleum refining industry and is one of the main active components of the most important cracking catalyst. The Y-type molecular sieve after rare earth ion exchange (REY, also known as rare earth Y-type molecular sieve) is an active component of a catalytic cracking catalyst with high activity, high stability and anti-toxicity. [0003] First, rare earths ...

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Problems solved by technology

This method can realize the complete utilization of rare earth ions, but there will be inhomogeneity in the deposition process of rare earth, which will lead to the uneven distribution of rare earth ions in REY

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