Method for preparing Y-type molecular sieve by using kaolin

Abstract

The invention discloses a method for preparing a Y-type molecular sieve by using kaolin, which comprises the following steps of: (1) introducing an intercalation reagent into the kaolin to prepare kaolin intercalation composite powder; (2) modifying the kaolin intercalation composite powder with silicon or directly roasting the kaolin intercalation composite powder at the temperature of between 450 and 1,030 DEG C; or modifying the kaolin intercalation composite powder with silicon or directly adding the kaolin intercalation composite powder into inorganic binder and water, uniformly mixing the three, spraying the mixture to obtain microspheres and then roasting the microspheres at the temperature of between 450 and 1,030 DEG C; and (3) mixing the roasted powder or microspheres and inorganic silicon source, sodium hydroxide solution, directing agent and water, and crystallizing the mixture to obtain powder or microspheres containing the NaY molecular sieve. The method is characterizedin that: the intercalation modified kaolin is used for synthesizing the NaY molecular sieve; the intercalation reagent is one or more of urea, dimethyl sulfoxide, potassium acetate, potassium propionate, formamide, long-chain amine with carbon atom number of 8 to 12 and N-methylformamide; and the NaY content of the synthesized powder or microspheres of the NaY molecular sieve is 40 to 100 percent.

Description

technical field [0001] The present invention is a method for synthesizing Y-type molecular sieve through kaolin and its preparation method. Specifically, it is a method for preparing Y-type molecular sieve by crystallization of modified kaolin. The content of NaY is 10% to 100%. The ratio is 2.0 to 6.0. Background technique [0002] With the heavy and inferior crude oil in the world, the refining of heavy oil and residual oil in the catalytic cracking process has become the main processing raw material used by various manufacturers. Since heavy oil contains more colloids, asphaltenes and heavy metals, FCC catalysts are required to have higher matrix activity, stronger resistance to metal pollution, better catalytic activity and selectivity. Among them, the FCC catalyst containing Y-type zeolite is currently the most used type of catalyst with the highest sales. [0003] Synthesizing molecular sieves with kaolin as a raw material can be traced back to the 1960s. US3,391,994...

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Problems solved by technology

[0008] The silica and alumina in kaolin are often in a crystalline structure, which is difficult to react with acid or alkali. Therefore, before using kaolin as a raw material to synthesize molecular sieves, it is often necessary to roast kaolin at high temperature to convert it into a highly reactive silica-alumina. species, which require higher heat energy consumption

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