【摘要】 针对汽柴油市场对芳烃吸纳能力下降、大分子芳烃出路受阻的行业痛点，对催化裂化柴油（LCO）加氢转化全过程开展系统优化，以实现芳烃资源化利用与柴油高值化。以芳烃质量分数大于80%的LCO为原料，在固定床加氢装置上优化加氢精制反应区和加氢裂化反应区的匹配状况，确定加氢精制段适宜的多环芳烃饱和率约为70%、芳烃过度饱和率低于5%,加氢裂化段170℃以上馏分的单程转化率为60%～70%、开环和断侧链率约为80%,有效抑制了芳烃过饱和，有利于保留单环芳烃。研究结果表明，C₆～C₉芳烃产率达到42%,芳烃选择性达到87%,其中C₆～C₈芳烃产率达到33%,总芳烃损失显著减少，为炼油厂压减柴油、芳烃资源化利用提供了可行路径。更多还原

【Abstract】 To address the industry pain points of declining aromatics uptake capacity in the gasoline and diesel markets and the limited outlets for heavy aromatics, a systematic optimization of the entire process of FCC diesel（LCO） hydrogenation conversion was carried out to achieve both the resource utilization of aromatics and the value enhancement of diesel. Using LCO with the mass fraction of aromatics exceeding 80% as feedstock, the matching condition between the hydrorefining and hydrocracking reaction zones was optimized on a fixed bed hydrogenation unit. The appropriate saturation rate of polycyclic aromatic hydrocarbon in the hydrorefining section was determined to be around 70%, and supersaturation rate of aromatics was less than 5%; in the hydrocracking section, the single-pass conversion rate for fractions above 170 ℃ was 60%-70%, and open loop and broken side chain rates were approximately 80%, effectively suppressing supersaturation of aromatics and enhancing the retention of monocyclic aromatic hydrocarbon. The research results showed that the yield of C₆-C₉ aromatics reached 42%, and the selectivity of aromatics was 87%. Among them, the yield of C₆-C₈ aromatics was 33%, and the total loss of aromatics was significantly reduced, providing a feasible pathway for refineries to reduce diesel output and utilize aromatics resources.更多还原