A flexible single-stage two-catalyst hydrocracking process

Abstract

The invention discloses a flexible single-stage two-catalyst hydrocracking process. Raw oil and hydrogen are mixed and then enter a hydrocracking reactor, and a material passing through an upper hydrogenation pretreatment catalyst and a hydrocracking catalyst bed layer is divided into two streams; one material stream is separated through a gas-liquid separator, and obtained liquid is pumped out ofthe hydrocracking reactor, mixed with hydrogen and then subjected to a hydroisomerization cracking reaction; the other stream which is a gas-liquid mixture flows downwards through a single-stage hydrocracking catalyst bed layer at the lower part; and an obtained single-stage hydrocracking reaction product and an obtained hydroisomerization cracking reaction product are subjected to gas-liquid separation and fractionation separately to obtain distillate oil and tail oil products with different specifications. The invention provides the single-stage hydrocracking process for simultaneously producing distillate oil and tail oil of two different specifications on a set of hydrogenation equipment for the first time, heat carried by part of cracked materials can be fully utilized, and couplingoperation of a single-stage two-catalyst hydrocracking reactor and a hydroisomerization cracking reactor can be realized.

Description

technical field [0001] The invention belongs to the field of petroleum refining, and in particular relates to a single-stage two-dose hydrocracking process for flexibly producing high-quality naphtha, jet fuel, diesel oil and tail oil products of 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...

AI Technical Summary

Problems solved by technology

Therefore, when using the above hydrocracking processes alone, you can only choose different types of single-stage two-dose hydrocracking catalysts according to your needs, or use two molecular sieve composite catalysts, or use two types of hydrocracking catalysts in gradations. However, these processes can only produce tail oil products of one nature, that is, the operation flexibility is relatively poor

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