重油催化裂解反应条件下丙烯的转化反应 Ⅰ.反应性能及反应路径

 在固定流化床催化裂化实验装置上，考察了重油催化裂解反应条件下丙烯的反应性能。结果发现，丙烯在重油催化裂解反应条件下是一种化学性质活泼的物质；可以通过催化反应转化为乙烯、丙烷、丁烯、汽油馏分中的芳烃和烯烃等反应产物。在脉冲微反实验装置上，通过对中间反应产物的捕捉，提出了丙烯的低聚反应和低聚产物的再裂解反应和芳构化反应以及丙烯的氢转移反应是丙烯转化的主要反应路径。其中, 丙烯的低聚反应和低聚产物的丙裂解反应使丙烯转化为碳数大于3和小于3的烯烃; 低聚产物的芳构化反应使丙烯间接转化为芳烃; 氢转移反应使丙烯转化为丙烷。

PROPYLENE TRANSFORMATION DURING DEEP CATALYTIC CRACKING OF HEAVY OIL I. Reactivity and Reaction Pathways

Pure propylene gas was employed as feedstock to examine the reactivity of propylene under heavy oil deep catalytic cracking conditions in a laboratory fixed-fluidized bed reactor. It was demonstrated that propylene was not a chemical stable product, but an active one under the conditions of deep catalytic cracking of heavy oils. The main products of the propylene catalytic transformation were ethylene, propane, butylenes, olefins and aromatics of FCC naphtha cut, et al. The data collected from the experiments carried out in a pulsative reactor validated that oligomerization of propylene, subsequent cracking and aromatizations of the oligomers, hydrogen transfer of propylene were the main reaction pathways of propylene transformation. Through the reaction pathways of oligomerization and subsequent cracking of the oligomers, propylene was converted into olefins with the carbon number being bigger and smaller than 3. Through reaction pathway of oligomer aromatization, propylene could be converted into aromatics indirectly, and propylene could be also converted into propane through hydrogen transfer reaction.