Hydrotreating method for maximum production of middle distillates

Abstract

The invention relates to a hydrotreating method for maximum production of middle distillates. The method comprises the following steps that: fresh feedstock oils are simultaneously introduced into a hydrofining reactor and a hydrocracking reactor in a co-current flow way; the hydrofining reactor is sequentially filled with a hydrofining catalyst and an amorphous hydrocracking catalyst; the hydrocracking reactor is sequentially filled with an amorphous hydrocracking catalyst and a zeolite hydrocracking catalyst; and all or part of the tail oil fractions are introduced into the hydrocracking reactor, and a reaction effluent from the hydrocracking reactor and part of the feedstock oils are introduced into the hydrofining reactor together. According to the method provided by the invention, the heavy distillates can be treated, and the maximum production of the middle distillates can be realized. Only the tail oil fractions are introduced into the hydrocracking reactor, so that the selectivity of middle distillates is improved; and part of the feedstock oils is introduced into the hydrocracking reactor, so that the phenomenon that more middle distillates are cracked secondarily in an ammonia-free environment in the hydrocracking reactor is avoided, and thus the yield of the middle distillates is effectively improved.

Description

technical field [0001] The invention belongs to a hydrocracking method for obtaining low-boiling distillate hydrocarbon oil in the presence of hydrogen. Background technique [0002] With the deterioration of crude oil quality year by year and the increasingly stringent environmental protection requirements worldwide, the hydrocracking process, as one of the main means of crude oil secondary processing and heavy oil lightening, has strong raw material applicability, flexible production plan, liquid With high product yield and good product quality, it is playing an increasingly important role in the deep processing of sulfur-containing and high-sulfur crude oil to produce clean fuels, and its application range is becoming more and more extensive. [0003] In recent years, the market demand for various oil products, especially high-quality middle distillate products, has continued to grow, and the pressure on refineries to produce high-quality middle distillate products has al...

AI Technical Summary

Problems solved by technology

Compared with amorphous hydrocracking catalysts, molecular sieve hydrocracking catalysts have high activity and low initial reaction temperature, but the yield of middle distillates is relatively low

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