A flexible hydrocracking process for the production of lube base stocks

Abstract

The invention discloses a flexible hydrocracking method for producing lubricating oil base oil. The wax oil raw material after hydrogenation pretreatment is divided into two parts; one part of the material is separated by a hot high-pressure separator to obtain a gas phase and a liquid phase, and the other part of the material is mixed with a hot high-fraction gas phase and circulating hydrogen and passed through a hydrogenation system containing a Y-type molecular sieve. Cracking catalyst bed; after the hot high-resolution liquid phase is mixed with hydrocracking tail oil and circulating hydrogen, it passes through the hydroisomerization cracking catalyst bed containing isomerization cracking type molecular sieve; hydrocracking reaction product and hydroisomerization cracking The reaction products are subjected to gas-liquid separation and fractionation respectively to obtain distillate oil and tail oil of different specifications, and part or all of the hydrocracking tail oil is recycled into the isomerization cracking reactor. The present invention provides for the first time a flexible hydrocracking method for simultaneously producing two or more different specifications of naphtha, aviation fuel, diesel oil, and tail oil products, especially high-quality lubricating oil base oil, 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 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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