A flexible single-stage two-catalyst hydrocracking process

Abstract

The invention discloses a flexible single-stage two-catalyst hydrocracking process. A wax oil raw material and hydrogen are mixed and then enter a single-stage two-catalyst hydrocracking reactor, andthe material passing through an upper hydrogenation pretreatment catalyst bed layer and a single-stage hydrocracking catalyst bed layer is divided into two streams; one material stream is extracted out of the single-stage reactor from the middle of the bed layers, enters a hydroisomerization cracking reactor and subjected to isomerization cracking reaction; the other material stream flows downwards through a single-stage hydrocracking catalyst bed layer at the lower part; and a single-stage hydrocracking reaction product and a hydroisomerization cracking reaction product are respectively separated and fractionated to obtain distillate oil and tail oil products with different specifications. The invention provides the process for simultaneously producing more than two types of light naphtha, heavy naphtha, aviation kerosene, diesel oil and tail oil products with different specifications on a set of hydrogenation process equipment. In the process, heat carried by part of cracked materials can be fully utilized, and coupling operation of the single-stage two-catalyst hydrocracking reactor and the hydroisomerization cracking reactor is achieved.

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

Images