Two-stage hydrocarbon hydrogenation method for cracking different fractions of generated oil at refining stage in branches

Abstract

The invention relates to a two-stage hydrocarbon hydrogenation method for cracking different fractions of generated oil at a refining stage in branches. In the method, in the second-stage hydrogenation part, a first-stage hydrogenation generated oil high-boiling fraction (HBO) enters a second-stage first reaction region (2R1) to contact with a first hydrocracking catalyst (2R1C), so that a second-stage first hydrocracking reaction is finished and the HBO is converted into a reaction effluent (2R1P) of the second-stage first reaction region; 2R1P-based material flow and first-stage hydrogenation generated oil low-boiling fraction (LBO)-based material flow contact with a combined hydrocracking catalyst (2RUC) in a second-stage combined hydrocracking reaction region, so that a second-stage combined hydrocracking reaction is finished and a second-stage combined hydrocracking reaction effluent (2RUPM) is obtained; the 2RUPM is separated and products of the 2RUPM are recovered; and other product material flow which may exist in the second-stage hydrogenation part are recovered. The method has the advantages of avoidance of overcracking of the LBO and simple flow and is particularly suitable for the process of producing high-quality diesel components by a two-stage coal tar hydrocracking method.

Description

technical field

[0001] The invention relates to a two-stage hydrocarbon hydrogenation method in which different fractions of oil produced in the refining section are cracked separately. In the second-stage hydrogenation reaction part, the high-boiling fraction HBO of the oil produced by hydrogenation in the first stage enters the first reaction zone 2R1 of the second stage and is connected with the first reaction zone 2R1. The hydrocracking catalyst 2R1C is contacted to complete the second-stage first hydrocracking reaction and is transformed into the second-stage first reaction zone reaction effluent 2R1P, and the stream based on 2R1P and the stream based on the low-boiling point fraction LBO of oil generated by the first-stage hydrogenation are combined in the second stage. The hydrocracking reaction zone 2RU is contacted with the combined hydrocracking catalyst 2RUC to complete the two-stage combined hydrocracking reaction, and the second-stage combined hydrocracking reactio...

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