Residual oil hydrotreatment and hydrofining combined process

Abstract

The invention discloses a residual oil hydrotreatment and hydrofining combined process. Residual oil raw materials and hydrogen are mixed and then enter a hydrotreating reactor; the material generatedby hydrotreating after passing through a graded hydrotreating catalyst bed layer enters a hydrotreating hot high-pressure separator to be separated; an obtained hot gas phase material flow is mixed with LCO, and the mixture is fed into a hydrofining reactor and subjected to a hydrofining reaction; a material generated by hydrofining is separated; and a liquid phase separated by a hydrotreating high-pressure separator and a liquid phase obtained by hydrofining high-pressure separation are fractionated to obtain naphtha, diesel oil, hydrogenated heavy fractions and the like. The invention provides the flexible hydrogenation process for producing high-quality catalytic cracking raw materials by processing different raw material oil materials on one set of combined hydrogenation process equipment.

Description

technical field [0001] The invention belongs to the field of petroleum refining, and in particular relates to a combined process of residue oil hydrotreating and LCO hydrofining for flexibly producing high-quality catalytic cracking raw materials by using residue oil and LCO as feedstock oil. Background technique [0002] Fluid Catalytic Cracking (FCC) is one of the important means of lightening heavy oil, but with the deterioration and heavyness of catalytic cracking raw materials, its operating conditions are becoming more and more stringent, and the yield of light products and products However, the hydroprocessing technology of catalytic cracking raw materials can not only remove the content of impurities such as sulfur, nitrogen, and metals, but also improve the cracking performance of the feed, reduce the severity of FCC operation, improve product distribution, and increase the selectivity of target products. Reduce the yield of dry gas and coke, improve the economics o...

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Problems solved by technology

[0003] CN106701189A, CN106701190A, CN106701191A and CN102732314A disclose a process technology for blending LCO and / or heavy cycle oil in the residual oil hydrotreating process, the main purpose is to produce high-quality catalytic cracking raw materials, or to allow LCO to The combined processing technology with circulation between the catalytic cracking unit realizes the clean production of the catalytic cracking unit. However, since the residual oil is directly hydrogenated after mixing with LCO, the hydrogenation depth of LCO cannot be effectively controlled, and only the mixed hydrogenation product (catalytic cracking The sulfur content or nitrogen content of raw materials) is used as the control target, which is not conducive to the effective control of LCO production of high-quality gasoline

[0004] To sum up, compared with the existing LCO hydrogenation technology and residual oil hydroprocessing technology, usually LCO is directly blended into the residual oil hydrotreating unit for hydrogenation, and the hydrogenated residual oil obtained after hydrogenation is mixed Together with hydrogenated LCO as the raw material of the catalytic cracking unit, that is, LCO is hydrogenated and then returned to the catalytic cracking unit. Since the hydrogenation depth of LCO is not deliberately controlled, only the total sulfur and total nitrogen content of the hydrotreated mixed material is controlled, resulting in catalytic cracking. The quality of cracked gasoline is not the best

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