直馏柴油催化裂化加工技术探索

摘要

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 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 of 99 is approximately 22%.The higher blending ratio of straight-run middle distillate with heavy oil feed for FCC improves the gasoline selectivity, but increases the aromatics content in gasoline.