A metal trapping agent, its preparation method and application, and a catalytic cracking method

Abstract

The invention provides a metal chelating agent, and a preparation method and an application thereof. The metal chelating agent contains magnesium oxide and stepped pores-distributed alumina, and at least parts of alumina and at least parts of magnesium oxide form a magnesium aluminate spinel structure; the stepped pores-distributed alumina contains macro-porous alumina and micro-porous alumina; in the macro-porous alumina, the volume of pores with the pore volume of 2-5nm is 20-35% of the volume of pores with the pore volume of 2-100nm, the volume of pores with the pore volume of 5-10nm is 25-45% of the volume of pores with the pore volume of 2-100nm, and the volume of pores with the pore volume of 10-60nm is 20-50% of the volume of pores with the pore volume of 2-100nm; and in the micro-porous alumina, the volume of pores with the pore volume of 2-5nm is 50-70% of the volume of pores with the pore volume of 2-100nm, the volume of pores with the pore volume of 5-10nm is 15-30% of the volume of pores with the pore volume of 2-100nm, and the volume of pores with the pore volume of 10-60nm is 10-20% of the volume of pores with the pore volume of 2-100nm. The invention also provides a catalytic cracking method. The metal chelating agent has a very good metal chelating effect, and can alleviate the destroys of vanadium to a cracking catalyst, improve the yields of liquid products and reduce the yields of dry gas and coke when the metal chelating agent is used in the catalytic cracking of high-vanadium heavy oil.

Description

technical field [0001] The invention relates to a metal trapping agent, a preparation method of the metal trapping agent, an application of the metal trapping agent in catalytic cracking, 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 str...

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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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