Hydrocracking process for flexibly producing diesel oil

Abstract

The invention discloses a hydrocracking process for flexibly producing diesel oil. A wax oil raw material is subjected to hydrogenation pretreatment and then enters a hydrocracking reactor; the obtained hydrocracked material is divided into two streams; one stream enters a hot high-pressure separator to be separated to obtain a gas phase and a liquid phase; one hydrocracked material stream which does not enter the high-pressure separator is mixed with the gas phase separated by the hot high-pressure separator, and the mixture is subjected to gas-liquid separation and fractionation to obtain hydrocracked naphtha, aviation kerosene, diesel oil and tail oil; the liquid phase obtained through separation by the hot high-pressure separator is mixed with a part or all of the hydrocracking tail oil and then mixed with hydrogen, the mixture is subjected to a hydroisomerization cracking reaction, and an obtained hydroisomerization cracking material is subjected to gas-liquid separation and fractionation to obtain hydroisomerization cracked naphtha, aviation kerosene, diesel oil and tail oil. The invention provides, for the first time, the hydrocracking process for simultaneously producing more than two aviation kerosene, diesel oil and tail oil products with different specifications on one set of hydrogenation process equipment, particularly diesel oil products with different condensation points.

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 naphtha, jet fuel, diesel oil and tail oil products of different properties from wax 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 full cycle process. Hydrocracking ...

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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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