直馏柴油催化裂化加工技术探索

采用小型固定流化床实验装置，探索研究了直馏柴油催化裂化加工技术路线的可行性。结果表明：催化裂化是将直馏柴油转化为高附加值产物的切实可行的工艺技术；采用催化裂化技术路线时，直馏柴油直接催化裂化反应具有较高的汽油和丙烯收率，分别可达48%和8%左右；采用催化裂解技术路线时，直馏柴油直接催化裂解反应具有较高的低碳烯烃和BTX（苯、甲苯和二甲苯）收率，在反应温度为620℃时乙烯、丙烯和BTX总收率可达39%以上，并可副产22％以上的高辛烷值汽油，其 RON在99以上；重油原料掺炼直馏柴油时，直馏柴油掺入比例较高时催化裂化反应性能较好，但会导致汽油产物中芳烃含量增加。

EXPLORATION ON CATALYTIC CRACKING OF STRAIGHT-RUN MIDDLE DISTILLATE

Exploration on catalytic conversion of straight-run middle distillate was conducted in a fixed fluidized bed reactor. The results show that catalytic cracking process is a practical technology for the conversion of straight-run middle distillate into high value added products. The gasoline yield of 48% and the propylene yield of 8% are obtained in this process. While using direct catalytic pyrolysis at 620 ℃ the total yield of light olefins and BTX is above 39% and a yield of byproduct gasoline with RON 99 is approximately 22%. The higher blending ratio of straight-run with heavy oil feed for FCC improves the gasoline selectivity, but increases the aromatics content in gasoline.