Preparation method and application of catalytic cracking metal passivant

Abstract

The invention relates to a preparation method and application of a catalytic cracking metal passivant. The preparation method comprises the following steps of: preparing raw materials in the following percentage by weight: 20%-45% of dispersing agents, 30%-50% of oxidants, 15%-30% of metal oxides, 10%-30% of solvents and 2%-5% of stabilizing agents; sequentially adding the oxidants and the metal oxides to the dispersing agents during preparation; increasing temperature to 50-90 DEG C within 2-4 hours, keeping the temperature for 1-5 hours and then cooling; adding the solvents and the stabilizing agents, and then filtering to remove impurities so as to obtain the metal passivant, wherein the dispersing agents are diethanol amine and/or triethanol amine; the oxidants are hydrogen peroxide of 30-50 percent and/or nitric acids of 66-68 percent; the metal oxides are one of diantimony trioxide, rare earth oxides and bismuth oxides or mixtures of more than two of the diantimony trioxide, the rare earth oxides and the bismuth oxides in any proportion; the solvents are one of water or alcohol solvents or mixtures of more than two of the water or the alcohol solvents in any proportion; and the stabilizing agents are methylcellulose compound solutions.

Description

technical field [0001] The invention relates to a preparation method and application of a catalytic cracking metal passivator. Background technique [0002] The catalytic cracking unit occupies a dominant position in the refining unit. After heat exchange, the raw material is cracked in contact with the catalyst in the catalytic cracking reactor to obtain dry gas, liquefied gas, gasoline, diesel, coke and oil slurry. Affected by the supply and quality of crude oil, the content of metal elements in crude oil is increasing day by day. What the refining companies are pursuing is high residue ratio, low coke yield and high light oil or total liquid yield in order to achieve the maximum Economic benefits also accelerate the rise of metal elements in the catalytic raw materials on the other hand. The metal elements in the catalytic raw material are very harmful to the catalyst, especially nickel is particularly harmful to the catalyst, which will affect the distribution of cataly...

AI Technical Summary

Problems solved by technology

This product can only replace metal deactivators in some catalytic cracking units, and is basically ineffective for heavy metal pollution in catalytic cracking units of MIP-CGP (produce more isoparaffins and increase propylene) process

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