A preparation method of a catalyst for improving the yield of catalytic cracking diesel oil

Abstract

The invention discloses a preparation method of a catalyst for improving the yield of diesel oil produced by catalytic cracking. The preparation method comprises the following steps: with a mixture of kaolin and diatomite subjected to acid treatment as a raw material, adding chemical water, structural auxiliaries, a dispersing agent and / or a reinforcing agent into the mixture, and performing mixed pulping and spraying to obtain microspheres; roasting the sprayed microspheres, mixing the roasted microspheres with a guiding agent, sodium silicate and sodium hydroxide in a certain ratio, and performing a crystallization reaction under hydrothermal conditions, thereby obtaining a crystallization product with a pore structure and excellent abrasion resistance and with a 20%-30% NaY molecular sieve, wherein the crystallization product, namely the in-situ crystallized microspheres, can be taken as a precursor for preparing the catalytic cracking catalyst; and exchanging the in-situ crystallized microspheres with ammonium salt and rare earth to obtain the catalytic cracking catalyst for improving the yield of diesel oil.

Description

technical field [0001] The invention relates to a preparation method of an oil refining catalyst, and more specifically relates to an in-situ crystallization type catalytic cracking catalyst and a preparation method thereof. Background technique [0002] The purpose of the fluidized catalytic cracking (FCC) reaction is the process of producing gasoline, diesel, liquefied gas and other small molecular products through catalytic reactions of heavy raw materials with large molecules. As crude oil becomes heavier and worse, increasing the processing ratio of macromolecular heavy oil, especially residual oil, in the FCC process is of great significance for improving the economic benefits of refineries. Taking a heavy oil catalytic cracking unit with a processing capacity of 3 million tons per year as an example, by increasing the conversion capacity of heavy oil, the yield of the target product can be increased by 1 percentage point, and the direct economic benefits will increase...

AI Technical Summary

Problems solved by technology

However, in terms of pore structure design, it mainly depends on the pore channel formed by the chemical silicon oxide formed after kaolin is thermally converted and extracted in an alkaline system, or depends on the accumulation gap between kaolin particles or the addition of organic matter after thermal extraction. Improve the porosity, but there are disadvantages in the process, such as complicated procedures, environmental protection or poor strength

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