Metal trap and catalytic cracking method

Abstract

A metal trapping agent and catalytic cracking method, the metal trapping agent is prepared according to the following steps: (1) mixing small-pore alumina, deionized water and acid to obtain the first slurry; (2) mixing the The first slurry is contacted with magnesium hydroxide and / or magnesium oxide to obtain the second slurry; (3) the second slurry is contacted with macroporous alumina to obtain the third slurry; (4) after the third slurry is spray-dried Roasting to obtain a solid; (5) contacting the solid with a water-soluble magnesium source solution, drying or not drying the contacted mixture and then roasting; the mixing pulping in step (1) and / or the contacting in step (2) And / or the contacting of step (3) and / or the contacting of step (5) are carried out in the presence of a phosphorous aluminum additive and / or a precursor of a phosphorous aluminum additive. The metal trap provided by the invention is used in catalytic cracking of heavy oil with high vanadium, which can slow down vanadium's damage to cracking catalyst, increase liquid product yield, and reduce dry gas and coke yield.

Description

technical field [0001] The invention relates to a metal trapping agent and a catalytic cracking method. Background technique [0002] The continuous rise of crude oil prices has greatly increased the processing costs of refineries. At present, catalytic cracking is an important means of heavy oil processing in refineries. In order to reduce costs and maximize benefits, heavy oil can be processed through deep processing and low-quality oil. to realise. [0003] However, low-quality crude oils are generally higher in heavy metals such as vanadium. The vanadium-containing compounds in petroleum are a kind of very complex metal complexes, which generally exist in the form of porphyrinic vanadium and non-porphyrinic vanadium. The boiling point of metalloporphyrin is generally between 565-650°C, and it is mainly concentrated in residual oil, but because of its strong volatility, it will also enter the catalytic cracking fraction. Non-porphyrin metal compounds may be compounds w...

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Problems solved by technology

Experiments have shown that deposition of 1000 μg / g of vanadium on the balancer is sufficient to cause damage to the zeolite and worsen product distribution

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