Preparation method of propylene catalytic cracking catalyst with yield increased

Abstract

The invention discloses a preparation method of a propylene catalytic cracking catalyst with yield increased. The preparation method includes the steps of: 1) mixing and pulping ZSM-5 molecular sieve with water, clay and pseudo-boehmite and stirring the slurry uniformly; 2) performing primary acidification to the slurry in the step 1) and stirring the slurry uniformly; 3) adding a sodium silicate solution to the acidified slurry and stirring the acidified slurry uniformly; 4) performing secondary acidification to the slurry in the step 3), and stirring the slurry uniformly; 5) adding alkaline silicon sol to the acidified slurry in the step 4), and stirring the slurry uniformly; and 6) performing spray granulation to the slurry in the step 5) and water-washing and drying a product. In the preparation method, silicon-aluminum gel is formed from the acidified pseudo-boehmite and the sodium silicate solution, thus forming a Si-Al tetrahedral structure. The catalyst has high hydrothermal-stability and meso- and macro-pore distribution, is suitable for heavy oil catalytic cracking reaction, and is low in or is free of reduction of gasoline and increases octane value of the gasoline. With silicon sol as a binding agent, hydrogen transfer activity of the catalyst is reduced, so that olefin, as a conversion raw material of the propylene, is not over-saturated, thus increasing the yield of the propylene.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a preparation method of a catalytic cracking catalyst for increasing the production of propylene. Background technique [0002] Propylene is an important chemical raw material, which mainly comes from the co-production of steam cracking to ethylene and the by-product of catalytic cracking process. In China, the catalytic cracking process occupies a dominant position in oil refining. Therefore, the production capacity of its by-product propylene accounts for more than 50% of the total market propylene. Therefore, increasing the propylene yield of catalytic cracking units is an important way to improve the comprehensive benefits of oil refineries. [0003] The addition of catalyst additives to increase the production of propylene in the catalytic cracking process is widely used due to the advantages of simple operation and flexible reaction. [0004] All catalyst man...

AI Technical Summary

Problems solved by technology

[0007] The catalysts for increasing production of propylene disclosed in the prior art, one is to improve the conversion of light olefins through ZSM-5 metal modification, but at the same time, the yield of gasoline is significantly reduced, and the yield of oil slurry will be increased after the addition ratio is too high

In addition, the use of phosphor-aluminum glue and silica sol as a binder only considers its bonding performance, and its specific surface area is relatively low.

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