Modified clay and preparation method thereof

Abstract

The invention relates to a modified clay and a preparation method thereof. The modified clay is prepared by being roasted at 800-1100 DEG C for 0.3-10h, comprising the following materials by mass percentage: 0.1-3.0 of P, 0.1-4.0 of RE2O3 and 0.1-1.5 of Na2O; the pore volume of the modified clay is 0.1-0.5ML / g, the specific surface is 50-400m / g, and the average grain diameter is 0.5-15mu m. The preparation method comprises the following steps: roasting clay at 800-1100 DEG C for 0.3-10h, mixing the roasted clay and deionized water evenly, adding inorganic alkali solution with 0.5-15 mol / L of OH-concentration in the mixture to react at 50-100 DEG C for 0.1-5h and obtaining clay slurry; filtering the clay slurry,,washing the obtained clay slurry by inorganic acid solution at 30-100 DEG C, introducing phosphorus and rare earth by soaking, separating and drying to obtain the modified clay; wherein, the mass ratio of deionized water to clay (dry basis) is 1.5-10, the mass ratio of inorganic alkali solution to clay (dry basis) is 0.5-8, and the inorganic alkali is selected out of one or more of sodium hydroxide, water glass, ammonia and sodium meta-aluminate.

Description

technical field [0001] The invention relates to a modified clay and a preparation method thereof, in particular to a modified clay used in a hydrocarbon catalytic cracking catalyst for heavy oil conversion and a preparation method thereof. Background technique [0002] Catalytic cracking catalyst is a kind of important oil refining catalyst. The content of clay carrier in the preparation of catalytic cracking catalyst can reach more than 50%, which plays an extremely important physical and chemical role. Clay mainly includes kaolinite group, smectite group and sepiolite group, of which kaolinite group accounts for more than 80%. At present, most of the clay carrier fillers of cracking catalysts are protokaolin, which basically has no reactivity. With the increasingly heavy and inferior quality of crude oil worldwide and the urgent requirement of catalytic cracking process to process residual oil, it is hoped that the carrier part of the cracking catalyst has a strong reacti...

AI Technical Summary

Problems solved by technology

However, the main problems in the existing modification methods are that the extraction rate of silicon in kaolin is too high, resulting in low product yield; The third is that part of the modification process has to go through high-temperature roasting, crystallization reaction, multiple ion exchange, roasting and other processes, resulting in long modification period and low product yield.

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