A flexible hydrocracking method for producing lubricant base oil

Abstract

The invention discloses a flexible hydrocracking method for producing lubricant base oil. The method includes dividing a wax oil raw material subjected to hydrogenation pretreatment into two parts; separating one part of the material by a hot high-pressure separator to obtain a gas phase and a liquid phase; mixing the other part of the material with the gas phase obtained by hot high-pressure separation and circulating hydrogen, and allowing the mixture to pass through a hydrocracking catalyst bed layer containing a Y-type molecular sieve; mixing the liquid phase obtained by hot high-pressureseparation with hydrocracking tail oil and circulating hydrogen, and allowing the mixture to pass through a hydroisomerization cracking catalyst bed layer containing an isomerization cracking type molecular sieve; respectively carrying out gas-liquid separation and fractionation on a hydrocracking reaction product and a hydroisomerization cracking reaction product to obtain distillate oil and tailoil products with different specifications; and partially or completely circulating the hydrocracking tail oil to an isomerization cracking reactor. The invention provides the flexible hydrocrackingmethod for simultaneously producing more than two kinds of naphtha, aviation kerosene, diesel oil and tail oil products with different specifications on a set of hydrogenation process equipment for the first time, especially high-quality lubricant base oil.

Description

technical field [0001] The invention belongs to the field of petroleum refining, and in particular relates to a hydrocracking method for flexibly producing high-quality naphtha, jet fuel, diesel oil and tail oil products of different properties, especially high-quality lubricating oil base oil. 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...

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

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