A flexible single-stage hydrocracking process

Abstract

The invention discloses a flexible single-stage hydrocracking process. A wax oil raw material and hydrogen are mixed and then enter a single-stage hydrocracking reactor, and the material passing through an upper single-stage hydrocracking catalyst bed layer is divided into two streams; one material stream is extracted out of the single-stage hydrocracking reactor from the middle of the bed layer,enters a hydroisomerization cracking reactor and is subjected to isomerization cracking; the other material stream flows downward to pass through a lower single-stage hydrocracking catalyst bed layer;and an obtained single-stage hydrocracking reaction material and an obtained hydroisomerization cracking reaction material are subjected to gas-liquid separation and fractionation separately to obtain naphtha, aviation kerosene, diesel oil and tail oil products with different specifications. The invention provides the single-stage hydrocracking process for simultaneously producing two or more light naphtha, heavy naphtha, aviation kerosene, diesel oil and tail oil products with different specifications on a set of hydrogenation process equipment for the first time. Heat carried by part of cracked materials can be fully utilized, and coupling operation of the single-stage hydrocracking reactor and the hydroisomerization cracking reactor is realized.

Description

technical field [0001] The invention belongs to the field of petroleum refining, and in particular relates to a single-stage hydrocracking process for flexibly producing high-quality 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 process. Among them, ...

AI Technical Summary

Problems solved by technology

Therefore, when using the above hydrocracking processes alone, you can only choose different types of single-stage hydrocracking catalysts according to your needs, or use two kinds of molecular sieve composite catalysts, or choose two kinds of hydrocracking catalysts for use in grades, 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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