Process method and process system combined with hydrogenation and catalytic cracking

Abstract

The invention relates to the field of heavy oil processing, and discloses a combined hydrogenation and catalytic cracking process and system, including: (1) introducing catalytic cracking raw oil into the first catalytic cracking riser to perform the first catalytic cracking reaction, separating the catalytic cracking The product of the cracking reaction; (2) introducing the catalytic cracking heavy cycle oil, optionally at least part of the catalytic cracking light cycle oil, into the hydrogenation unit for hydrogenation reaction, and separating the hydrogenation reaction product to obtain the hydrogenation cycle oil; (3 ) introducing a part of the hydrogenated cycle oil into the lower part of the second riser of the catalytic cracking for catalytic cracking reaction; introducing the gasoline fraction and another part of the hydrogenated cycle oil into the upper part of the second riser of the catalytic cracking and combining with the catalyst from the lower part of the second riser Carry out catalytic cracking reaction with oil and gas. The method provided by the invention can efficiently convert heavy oil and produce catalytic gasoline with low olefins and catalytic diesel with a higher cetane number, and can flexibly adjust the ratio of diesel to gasoline and has high yield of light oil.

Description

technical field [0001] The invention relates to the field of hydrocarbon oil processing, in particular to a hydrogenation and catalytic cracking combined process method and a hydrogenation and catalytic cracking combined process system. Background technique [0002] At present, the world is facing the trend of crude oil becoming heavier and worse, while people's demand for heavy fuel oil is gradually decreasing, while the demand for light oil is greatly increasing. Therefore, refiners are pursuing the maximum conversion of residual oil. [0003] Among the various methods of lightening residual oil, high-quality paraffin-based heavy oil can be directly subjected to catalytic cracking to produce light oil products. Inferior high-sulfur and high-residual carbon residue oil is first subjected to hydrotreating, and the hydrogenated tail oil is then processed by catalytic cracking. The residue oil is hydrotreated to remove impurities such as metals, sulfur, nitrogen, etc., and t...

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Problems solved by technology

[0009] CN1388219A reduces the content of gasoline olefins by using the hydrogen donor components with a distillation range less than 400°C to react with gasoline, but when it is necessary to reduce the gasoline olefins and at the same time lighten the hydrogen donor, it cannot be balanced

However, since gasoline enters one of the risers separately to reduce olefins, there is a regenerated catalytic cracking catalyst with strong gasoline contact cracking ability, which leads to more gasoline cracking, and there is no external hydrogen donor to provide hydrogen source for gasoline, and gasoline needs to obtain hydrogen from itself. Part of the problem of gasoline condensation and coking is more, resulting in a large loss of gasoline yield, and because there is no hydrogen donor and gasoline fed together, the effect of reducing olefins is not good

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