Flexible reverse-sequence hydrocracking process

Abstract

The invention discloses a flexible reverse-sequence hydrocracking process. The process comprises the following steps: mixing wax oil raw oil with a hydrocracked material; carrying out hydrogenation pretreatment; carrying out separation fractionation on the hydrogenation pretreated material flow to obtain gas, distillate oil and tail oil; carrying out hydrocracking pretreatment on the obtained tailoil, allowing the tail oil to pass through a first hydrocracking catalyst bed layer in a hydrocracking reactor to obtain a material, and dividing the obtained material into two streams; separating one material stream in a separator, extracting the obtained liquid phase out of the hydrocracking reactor, and subjecting the liquid phase to an isomerization cracking reaction in a hydroisomerization cracking reactor; allowing the other material stream to flow downward to pass through a second hydrocracking catalyst bed layer; and carrying out gas-liquid separation and fractionation on a hydroisomerization cracking reaction product to obtain hydroisomerization cracked naphtha, aviation kerosene, diesel oil and tail oil products. The invention provides the hydrocracking process for simultaneously producing more than two different-specification light naphtha, heavy naphtha, aviation kerosene, diesel oil and tail oil products on a set of hydrogenation process equipment.

Description

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

AI Technical Summary

Problems solved by technology

Therefore, when the above hydrocracking processes are used alone, different types of hydrocracking catalysts can only be selected according to needs, or two molecular sieve composite catalysts are used, or two hydrocracking catalysts are used in gradation, or reverse sequence Hydrocracking process technology, but the products of the same fraction range in these processes can usually only produce products of one specification, that is, the operation flexibility is relatively poor

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