Abstract:

As for the reformulation of FCC naphtha for olefin reduction over catalytic cracking catalysts, the reaction behavior was studied in a confined fluidized bed reactor.The influences of reaction temperature, catalyst to oil mass ratio and space velocity on product yields and octane number were investigated.The optimal operating conditions were obtained as follows: reaction temperature within 400—430℃, catalyst to oil mass ratio about 7 and space velocity about 20—30 h-1.The olefin content of FCC naphtha was significantly reduced by more than 40%,gasoline octane number was maintained, and the loss of fuel gas and coke was less than 2%(mass).Iso-paraffin and aromatics content was increased after reformulation.The reaction heat was also computed according to the product composition and its influence factors were analyzed.The results indicated that the process was exothermic at a low temperature and endothermic at a high temperature.The effects of reformulation conditions on the reaction heat was in the order of reaction temperature>catalyst to oil mass ratio>space velocity.

Key words: 催化裂化汽油, 烯烃, 反应规律, 反应热

摘要：

利用催化裂化催化剂在小型固定流化床实验装置上对催化裂化汽油催化改质降烯烃过程的反应规律进行了实验研究，详细考察了反应温度、剂油比和重时空速对产物收率和汽油辛烷值的影响，得到了催化裂化汽油改质过程的最佳实验操作条件：反应温度为400～430℃，剂油比为7左右，重时空速为20～30 h-1。在此基础上，计算了汽油改质过程的反应热，分析了反应条件对反应热的影响，揭示了反应热的变化规律。结果表明，低温改质为放热过程，高温改质为吸热过程。改质条件对反应热影响的强弱顺序为反应温度>剂油比>重时空速。

关键词: 催化裂化汽油, 烯烃, 反应规律, 反应热