A process combining hydrotreatment and hydrofining of residual oil

Abstract

The invention discloses a process combining hydrotreatment and hydrofining of residual oil. A residual oil raw material and hydrogen are mixed and then enter a hydrotreating reaction zone, and the material passing through an upstream protective agent and a hydrotreating catalyst bed layer is divided into two streams; one material stream enters a gas-liquid separator arranged in the middle of the bed layer, a gas-phase material obtained through separation is pumped out of the hydrotreating reaction zone and mixed with LCO, and the mixture enters a hydrofining reactor for a hydrogenation reaction; and the other material stream passes through a downstream hydrogenation catalyst bed layer; a hydrotreating reaction product and a hydrofining reaction product are subjected to gas-liquid separation and fractionation to obtain naphtha, diesel oil, hydrogenated heavy fractions and the like. The invention provides the hydrogenation combined process for flexibly processing different raw material oils on a set of hydrogenation equipment so as to produce high-quality catalytic cracking raw materials.

Description

technical field [0001] The invention belongs to the field of petroleum refining, and in particular relates to a residual oil hydrotreating and hydrofining combined process for flexibly producing high-quality catalytic cracking raw materials by using residual oil and LCO as raw material 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 of ...

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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, the quality of catalytic cracked gasoline has not reached the best, and there is no reaction material coupling Combined processing technology

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