Hydrogenation pretreatment method for catalytically-cracked raw oil

Abstract

A hydrogenation pretreatment method for catalytically-cracked raw oil comprises enabling raw oil to be contacted with a catalyst combination under the conditions of a hydrogenation processing reaction. The catalyst combination comprises a hydrogenation processing catalyst I and a hydrogenation processing catalyst II, and the hydrogenation processing catalyst I and the hydrogenation processing catalyst II in the catalyst combination are arranged to enable raw oil to be successively contacted with the catalyst I and the catalyst II. Based on the total amount by volume of the catalyst combination, the content of the catalyst I is 5-40%, and the content of the catalyst II is 60-95%. The catalyst I contains a boron-containing aluminium oxide carrier with a double-peak pore structure, and characterized by mercury intrusion porosimetry, the carrier has the pore volume of 0.8-1.2 mL / g and the specific surface area of 120-400 m<2> / g, the pore volume of pores with the diameter of 6-30 nm accounts for 58-80% of the total pore volume, the pore volume of pores with the diameter of 10-30 nm is less than 55% of the total pore volume, and the pore volume of pores with the diameter of 300-500 nm accounts for 10-35% of the total volume.

Description

Technical field [0001] The invention relates to a method for hydrotreating hydrocarbon oil. Background technique [0002] With the intensification of the trend of heavy crude oil and the increasing demand for light oil products from social development, the combined process technology of heavy oil hydrogenation and catalytic cracking is generally favored by oil refineries. The combined process can not only increase the yield of light oil products, but also help reduce the emission of pollutants such as sulfur and nitrogen, and has obvious social and economic benefits. Affected by the catalytic cracking process and catalysts, in order to increase the yield of light oil products and reduce the sulfur content in FCC gasoline, it is usually required that the metal Ni+V content in the feedstock oil for catalytic cracking processing should be less than 1ppm, and the sulfur content should be less than 3000ppm. However, due to the continuous deterioration of raw material properties, the ...

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Problems solved by technology

Improving the removal rate of impurities can be achieved by increasing the severity of the hydrotreating reaction, but this will also lead to a shortened catalyst operating life

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