Revivification method for catalytic cracking waste catalyst

Abstract

The invention relates to a revivification method for a catalytic cracking waste catalyst, which is characterized in that composite acid and ammonium salt are treated, and at least one of a supported rare earth treatment process and a phosphorus-containing acid treatment process is employed. a principle is characterized in that by improving a tunnel structure of the catalyst, composite acid is used for dredging the tunnel of the catalyst, a part of structure of molecular sieve is reconstructed through reaction and calcinations, acidity of the catalyst is adjusted by a rare earth compound-containing and / or phosphate-containing compound, so that waste catalyst performance can be recovered, the specific surface and activity of the recovered catalyst can be obviously increased, stability is obviously increased, good liquefied gas and low carbon olefin selectivity can be presented, green coke is reduced, liquid recovery is increased, gasoline RON is increased by 0.5-3 points, propylene and butylene yield can be respectively increased by more than 20-40% and 10-30%.

Description

technical field [0001] The invention relates to a method for revitalizing spent catalytic cracking catalysts, which belongs to the field of waste treatment and reuse. Background technique [0002] Fluid catalytic cracking (FCC) is one of the most important processing methods in petroleum processing. It is to crack heavy raw oil into light oil and liquefied gas at high temperature and under the action of a catalyst. Because the raw oil processed is different or Different target products are subdivided into wax oil catalysis, heavy oil catalysis (RFCC), DCC process, etc., but the process must use catalysts containing molecular sieves. Commonly used molecular sieves include Y-type molecular sieves, ZSM-5 molecular sieves, beta molecular sieves, etc. Due to the high temperature in the reaction process, water vapor and the deposition of metals brought by raw materials on the catalyst, the catalyst initially loses its activity, and some parts become thinner and lost due to wear and ...

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Problems solved by technology

[0003] The spent catalyst contains about 1~4% of rare earth oxide, 2000~5000ppm of V, 3000~8000ppm of Ni, 1000~4000ppm of Fe, Ca, Cu, etc. It belongs to solid waste. Materials used as fillers, or paved asphalt roads or cement roads, etc.; there are few reports at home and abroad on the resurrection and reuse of spent catalysts. The main ones that can be seen are pickling, high-intensity magnetic separation, chlorination-sulfurization- Oxidation, etc., but either the process is complicated or the revival effect is limited

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