A flexible hydrocracking process

Abstract

The invention discloses a flexible hydrocracking process. After the wax oil raw material is pretreated by hydrogenation, it enters the hydrocracking reactor, and the material passing through the upper hydrocracking catalyst bed is divided into two strands; one strand of material is extracted from the hydrocracking reactor through the middle of the bed, and enters the hydrocracking reactor. The isomerization cracking reactor carries out the isomerization cracking reaction; another stream of material continues to flow downward through the lower hydrocracking catalyst bed; the obtained hydrocracking reaction material and hydroisomerization cracking reaction material are subjected to gas-liquid separation and fractionation respectively Get different specifications of naphtha, jet fuel, diesel and tail oil products. The present invention provides for the first time a hydrocracking process for simultaneously producing two or more different specifications of light naphtha, heavy naphtha, jet fuel, diesel oil, and tail oil products on a set of hydrogenation process equipment, which can make full use of partial cracking The heat carried by the material realizes the coupled operation of the hydrocracking reactor and the hydroisomerization cracking reactor.

Description

technical field [0001] The invention belongs to the field of petroleum refining, and in particular relates to a 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 process. Hydr...

AI Technical Summary

Problems solved by technology

Therefore, when using the above hydrocracking processes alone, you can only choose different types of hydrocracking catalysts according to your needs, or use two molecular sieve composite catalysts, or use two kinds of hydrocracking catalysts in grades, but these processes only It can produce tail oil products of one nature, that is, the operation flexibility is relatively poor

Images