Method and system for hydrogenation of wax oil

Abstract

The present invention relates to the field of petroleum refining, and discloses a method and system for hydrogenation of wax oil. The method includes: (1) contacting wax oil raw material oil and hydrogen-containing gas with a first hydrogenation treatment catalyst to obtain the first The hydrotreated stream is divided into two parts, the first hydrotreated stream a and the first hydrotreated stream b, and the first hydrotreated stream a is subjected to gas-liquid separation to obtain the first hydrotreated gas phase stream and the first hydrotreated stream Hydrotreating the liquid-phase stream; (2) contacting the first hydrotreating stream b, the first hydrotreating liquid-phase stream, and the hydrogen-containing gas with the second hydrotreating catalyst to obtain a hydrotreating product stream; (3) The first hydrotreating gas phase stream, the catalytic cracking light cycle oil and the hydrofinishing catalyst are contacted to carry out the hydrofinishing reaction to obtain the hydrofinishing product stream. The method and system provided by the invention can produce high-quality catalytic cracking raw materials with flexible process and low energy consumption.

Description

technical field [0001] The invention relates to the field of petroleum refining, in particular to a wax oil hydrogenation method and system. 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 content of the target product, reduce the content of SOx and NOx in the regeneration flue gas, etc. FCC light cycle oil (L...

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Problems solved by technology

[0003] CN103773495A, CN101875856A, CN102465035A and CN1896192A disclose the process technology of blending catalytic cracking light cycle oil in the wax oil hydrotreating process, the main purpose is to produce high-quality catalytic cracking raw materials, or to make the catalytic cracking light cycle oil in the wax oil hydrotreating unit Coupling technology with circulation between catalytic cracking units realizes clean production of catalytic cracking units. However, since wax oil is directly hydrogenated after being mixed with catalytic cracking light cycle oil, the hydrogenation depth of catalytic cracking light cycle oil cannot be effectively controlled. The sulfur content or nitrogen content of the mixed hydrogenation product (catalytic cracking raw material) is used as the control target, which is not conducive to the effective control of the production of high-quality gasoline with catalytic cracking light cycle oil

[0004] In summary, compared with the existing FCC light cycle oil hydrogenation technology and wax oil hydrotreating technology, FCC light cycle oil is usually directly blended into the wax oil hydrotreating unit for hydrogenation, mixing Hydrogenated wax oil obtained after hydrogenation and hydrocracked light cycle oil are used as raw materials for the catalytic cracking unit, that is, the catalytic cracked light cycle oil is hydrogenated and then returned to the catalytic cracking unit. Hydrogen depth, the quality of catalytic cracking gasoline has not reached the best, and, at present, there is no combined processing technology coupled with reaction materials

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