A combined process of hydrotreating and hydrocracking

Abstract

The invention discloses a combined process of hydrotreating and hydrocracking. The wax oil raw material passes through the first hydrogenation pretreatment catalyst bed, and the obtained material is divided into two streams; one stream of material is drawn out of the hydrogenation pretreatment reactor through the middle of the bed, and mixed with LCO to pass through the hydrotreatment reactor, and the hydrotreatment stream Carry out gas-liquid separation and fractional distillation to obtain catalytic cracking raw materials; another stream of material continues to pass through the second hydrogenation pretreatment catalyst bed, and the hydrogenation pretreatment stream passes through the hydrocracking catalyst bed for hydrocracking reaction, and the obtained hydrocracking reaction The material is subjected to gas-liquid separation and fractional distillation to obtain hydrocracking products such as naphtha, jet fuel, diesel oil and tail oil. The present invention provides for the first time a combined hydrogenation process for simultaneous production of hydrocracking light products and catalytic cracking raw materials on a set of hydrogenation process equipment, which can make full use of the heat carried by the hydrogenation pretreatment material to realize hydrogenation pretreatment Coupling operation of treatment reactor and hydrotreating reactor.

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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