关键词: 加氢裂化装置, 原料轻质化, 反应过程, 直馏柴油, 产品分布, 产品性质, 转化率, 加氢裂化尾油

Abstract:

In the context of feedstock lightening in hydrocracking units, the influence of blending different proportions of straight run diesel in VGO on the distribution and properties of hydrocracking reaction products was investigated. When the blending ratio of straight run diesel is 45%, the yield of jet fuel is the highest, reaching 26%. With the increase of direct diesel blending proportions, the cyclic hydrocarbon content and the aromatic hydrocarbon content of heavy naphtha produced by hydrocracking decrease. The smoke point of jet fuel shows a gradually increasing trend. The content of alkanes in the tail oil(above 260 ℃) shows a gradually increasing trend, while the content of cycloalkanes and aromatics shows a gradually decreasing trend and the BMCI value shows a trend of first increasing and then decreasing. When the blending proportions of straight run diesel is 75%, the smoke point of jet fuel is the highest, at 28.8 mm. When using wax oil mixed with 15% straight run diesel as feedstock, the BMCI value of the tail oil gradually decreases with the increase of conversion rate. When the yield of the tail oil is 20%, the BMCI value of the tail oil is as low as 7.2, the mass fraction of alkanes increases to 62.0%, the mass fraction of cycloalkanes decreases to 35.2%, and the mass fraction of aromatic is only 2.6%.

Key words: hydrocracking unit, feedstock lightening, reaction process, straight run diesel, product distribution, product properties, conversion rate, hydrocracking tail oil