酸性添加剂在强化催化裂化中的应用

应用Lewis酸碱理论和石油分散体系理论,研究了在进料中加入酸性添加剂的催化裂化反应,反应温度为500℃,进料量为13.5～14.5 g,剂油比为6,空速为20 h-1,反应压力为常压,用小型固定流化床催化裂化装置分别考察了使用不同催化剂和不同添加量的添加剂的轻油收率,其中添加剂的添加量和添加种类根据轻质油脱氮试验数据选择。工艺实验结果表明:酸性较强的添加剂存在着最佳添加量,添加量超过最佳值会使轻油收率降低。加入低碳醇可提高烯烃产率。以低碳醇为溶剂,加入芳香族衍生物也可有效提高轻油收率。当有机酸和低碳醇复合使用时,则会相对减弱有机酸和低碳醇的有效利用,但依然有着良好的强化作用。

The Applying of Acid Additives on the Intensified FCC

In the paper,petroleum disperse system theory and Lewis theory were applied to research the using of acid additives in FCC when temperature was 500 ℃,feedstock was 13.5～14.5 g,catalystoil ratio was 6,superficial tower velocity was 20 h^-1,reaction pressure was normal.A test was accomplished on catalytic cracking react operator of mini fluid fixed bed to inspect the light oil yield with different catalysts and various addition levels additives.The addition levels and categories of additives were determined by the data of denitrification.The FCC results indicated that acid additives have optimum addition level.An excess of additive can decrease the light oil yield.The less carbon number of hydrin can increase alkene yield.Yield also can be improved by aromatic derivant solved in less carbon number of hydrin.When organic acid and hydrin were blended,the efficiency would decrease.But the additives still had some positive effects.