催化裂化汽油二次反应过程中反应热的变化

根据热力学理论，通过产物和反应物的生成焓计算了催化裂化汽油在降烯烃改质以及催化裂解过程中的反应热，并根据不同反应过程的实验结果考察了反应温度、停留时间和剂油比对反应热的影响。计算结果表明，催化裂化汽油降烯烃改质和催化裂解过程都是吸热反应体系，降烯烃改质过程的反应热为80～150 kJ·kg^-1，催化裂解过程的反应热为370～620 kJ·kg^-1;反应条件对反应热的影响通过改变反应物的转化率和产物分布实现。在实验条件范围内，随着反应温度的升高、剂油比的增大和停留时间的延长，反应热逐渐增大;当剂油比增大到一定程度时，反应热随剂油比的增加趋势变缓。

Variation of reaction heat for secondary reaction of FCC gasoline

The reaction heats for upgrading and catalytic pyrolysis of FCC gasoline were calculated from the formation enthalpies of the reactants and products.The effects of temperature, residence time and catalyst to oil ratio on the reaction heat were investigated.The calculation showed that upgrading and catalytic pyrolysis of FCC gasoline were all endothermic processes.The reaction heat was 80—150 kJ·kg^-1 for upgrading of FCC gasoline and 370—620 kJ·kg^-1 for catalytic pyrolysis.The reaction heat was related to reaction conditions, i.e., conversion of gasoline and product distribution.With rising reaction temperature, increasing catalyst to oil ratio, and expanding residence time，the reaction heat increased under the experimental conditions.If the catalyst to oil ratio was large enough, the increase of reaction heat became slower with further increasing catalyst to oil ratio.