Flexible two-stage hydrocracking process

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 two-stage hydrocracking process for flexibly producing high-quality light naphtha, heavy naphtha, jet fuel, diesel oil and tail oil products with different properties. 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. According to whether the tail oil is recycled or not, it can be divided into three types: one-way one-pass process, partial cycle process and full cycle proc...

AI Technical Summary

Problems solved by technology

Therefore, when the above-mentioned two-stage hydrocracking processes are used alone, different types of hydrocracking catalysts can only be selected according to needs, or two kinds of molecular sieve composite catalysts are used, or two kinds of hydrocracking catalysts are used in gradation, but these The process can only produce tail oil products of one nature, that is, the operation flexibility is relatively poor

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