Production for synthesizing high-content NaY molecular sieve from kaolin atomized microball

Abstract

Synthesis of high-content NaY molecular sieve from kaolin spray micro-sphere is carried out by taking kaolin as raw materials, adding into functional components, removing ion water to obtain mixed size, spray drying to obtain kaolin micro-sphere, calcining at 700í½1000íÒC, mixed crystallizing by guiding agent, washing and drying by filter cake, or high-temperature baking one part of spray micro-sphere with 20í½110ª–m to obtain high-temperature calcined clay, baking another part of micro-sphere at low temperature to obtain biskaolin, mixing the two baked kaolin, and crystallization reacting under hydrothermal condition to obtain crystallized product containing NaY molecular sieve in proportion of NaY=46í½60% and silicon:aluminium=3.5í½5.5.

Description

technical field [0001] The invention belongs to the field of oil refining catalyst preparation, and relates to a preparation method for synthesizing high-content NaY molecular sieves by kaolin spray microspheres, more specifically, a method for synthesizing NaY molecular sieves by in-situ crystallization using kaolin spray microspheres as raw materials. The crystallization product synthesized by this method can be used as the precursor for preparing catalytic cracking catalyst. Background technique [0002] The usual method for preparing NaY molecular sieves is to synthesize them using an alkaline silica-alumina gel system. Generally, the raw materials used are sodium silicate, aluminum sulfate, sodium metaaluminate, and guiding agent as raw materials. In this way, the synthetic molecular sieve has the characteristics of high molecular sieve content and high silicon-aluminum ratio. Different modification methods can make it have a variety of reaction characteristics. . In ...

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Problems solved by technology

[0005] US4493902 describes the technology of synthesizing crystallized products with high zeolite content containing partial soil and high soil and seeds in the same microsphere. The crystallinity of crystallized products is higher than 40%, but the raw materials used for spray molding in USP4493902 technology are required Very high: use superfine high soil Satone №2 and superfine original soil ASP~600, this kind of superfine soil is expensive and not easy to buy in the market

[0006] EP369629 describes the method of increasing the fine powder high soil in the spray slurry to increase the pore volume of the parent microsphere, and to increase the zeolite content in the microsphere through the increase of the pore volume, which can make the crystallization product crystallinity up to 70%, but the ultrafine powder Shaped kaolin is expensive, and the spray microspheres contain a large amount of kaolin that has been roasted and has poor cohesiveness, which makes the microspheres poor in abrasion resistance

[0007] CN1232862 provides a method for preparing in-situ crystallized high molecular sieve content, but the pore structure of the crystallized product prepared by this method is not ideal, which affects the selectivity of heavy oil and coke

[0008] CN1429883 provides a method for preparing in-situ crystallization products with high molecular sieve content and strong anti-heavy metal ability. From the specific surface results of catalysts shown in the examples, this method does not reach the goal of increasing the molecular sieve content in crystallization products. Purpose

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