A flexible wax oil hydrotreatment process

Abstract

The invention discloses a flexible wax oil hydrotreatment process. A wax oil raw material and hydrogen are mixed and then enter a first hydrotreatment reactor, and the material passing through an upper hydrotreatment catalyst bed layer is divided into two streams; one material stream is extracted out of a first hydrotreatment reactor from the middle of the bed layer and mixed with LCO, and the mixture is fed into a second hydrotreatment reactor and subjected to a hydrogenation reaction; the other material stream flows downwards through a hydrotreatment catalyst bed layer at the lower part; andan obtained first hydrotreatment reaction material and an obtained second hydrotreatment reaction material are subjected to gas-liquid separation and fractionation to obtain naphtha, diesel oil, hydrogenation heavy fractions and the like. The invention provides the flexible hydrotreatment process for flexibly processing different raw oil materials on a set of hydrogenation equipment and producinghigh-quality catalytic cracking raw materials, which can make full use of heat carried by part of a first hydrotreatment material and can realize coupling operation of a first hydrotreatment reactorand a second hydrotreatment reactor.

Description

technical field [0001] The invention belongs to the field of petroleum refining, and in particular relates to a flexible hydroprocessing process for flexibly producing high-quality catalytic cracking raw materials using wax oil and LCO as raw material oils. 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 FCC unit, reduce the sulfur conten...

AI Technical Summary

Problems solved by technology

However, since wax oil is directly hydrogenated after mixing with LCO, the hydrogenation depth of LCO cannot be effectively controlled, and the sulfur content or nitrogen content of the mixed hydrogenation product (catalytic cracking raw material) can only be used as the control target, which is not conducive to the production of high-quality gasoline with LCO effective control of

[0004] In summary, compared with the existing LCO hydrogenation technology and wax oil hydrotreating technology, LCO is usually blended directly into the wax oil hydrotreating unit for hydrogenation, and the hydrogenated wax oil obtained after mixing hydrogenation 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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