Hydrotreating and hydrocracking combined process

Abstract

The invention discloses a hydrotreatment and hydrocracking combined process. A wax oil raw material passes through a first hydrogenation pretreatment catalyst bed layer, and the obtained material is divided into two streams; one material stream is pumped out of a hydrogenation pretreatment reactor from the middle of the bed layer and mixed with LCO, the mixture passes through a hydrogenation reactor, and the hydrogenated material is subjected to gas-liquid separation and fractionation to obtain a catalytic cracking raw material; and the other material stream passes through a second hydrogenation pretreatment catalyst bed layer, the hydrogenation pretreatment stream passes through a hydrocracking catalyst bed layer to be subjected to a hydrocracking reaction, and the obtained hydrocracked material is subjected to gas-liquid separation and fractionation to obtain hydrocracking products such as naphtha, aviation kerosene, diesel oil and tail oil. The invention provides the hydrogenation combined process for simultaneously producing a hydrocracking light product and a catalytic cracking raw material on one set of hydrogenation process equipment for the first time, heat carried by the hydrogenation pretreatment material can be fully utilized, and coupling operation of the hydrogenation pretreatment reactor and the hydrogenation reactor is realized.

Description

technical field [0001] The invention belongs to the field of petroleum refining, and in particular relates to a combined hydroprocessing and hydrocracking process for generating high-quality catalytic cracking raw materials and high-quality hydrocracking products. Background technique [0002] Hydrogenation technology is an important processing method for lightening heavy oil and upgrading the quality of light oil. Hydrocracking technology has developed rapidly due to the advantages of strong feed oil adaptability, good product flexibility, high liquid product yield, and high product quality. The existing hydrocracking technology can be divided into three types according to the processing flow: one-stage series hydrocracking process, single-stage hydrocracking process and two-stage hydrocracking process. One-stage series hydrocracking technology uses two types of catalysts, namely hydrocracking pretreatment catalyst and hydrocracking catalyst, and these two catalysts are lo...

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Problems solved by technology

[0004] CN106701175A, CN102465035A and CN001896192A disclose a process technology for blending LCO in a hydrotreating process, the main purpose of which is to produce high-quality catalytic cracking raw materials, or to allow LCO to circulate between hydrotreating units and catalytic cracking units. Clean production of cracking units, but because wax oil or residual oil is directly hydrogenated after mixing with LCO, the hydrogenation depth of LCO cannot be effectively controlled, and high-quality hydrocracking products cannot be produced

[0005] In summary, compared with the existing LCO hydrogenation technology and hydrocracking technology, usually LCO is directly blended to the catalytic cracking raw material pretreatment unit for hydrogenation, and then returned to the catalytic cracking unit, or LCO is blended to In the hydrocracking raw oil, after hydropretreatment, it enters the hydrocracking unit to produce hydrocracking naphtha products. In the same unit, wax oil and LCO are used as raw materials to simultaneously produce high-quality hydrocracking products and catalytic cracking products. There are fewer combined processing technologies for raw materials, and there is no combined processing technology for reaction material coupling

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