FCC汽油烯烃双分子裂化反应及其与双分子氢转移反应之比的研究

STUDY ON THE BIMOLECULAR CATALYTIC CRACKING REACTION AND ITS RATIO TO THE BIMOLECULAR HYDROGEN TRANSFER REACTION

以催化裂化汽油为原料,在不同类型的催化剂上进行催化转化试验,探讨催化裂化汽油烯烃双分子裂化反应及双分子裂化反应与双分子氢转移反应之比对液化气和汽油产率的影响。试验结果表明,汽油烯烃在不同类型催化剂上发生裂化反应强弱及裂化反应与氢转移反应之比不同;再生催化剂、较高的反应温度和较高的重时空速有利于裂化反应,从而有利于液化气产率的增加;待生催化剂、较低的反应温度和较低的重时空速有利于氢转移反应,从而有利于汽油收率的增加。通过调变双分子裂化反应与双分子氢转移反应之比,可以使催化裂化工艺的生产方案更具有多样性和灵活性。

The catalytic conversion experiments were processed using FCC naphtha as feed over various catalysts. The bimolecular cracking reactions of olefins were studied and the effect of ratios of bimolecular cracking reactions to hydrogen transfer reactions on the yields of LPG and gasoline were discussed. The results show that under the testing conditions the proceeding of olefins cracking and the ratios of cracking to hydrogen transfer are varied over various catalysts. Comparisons between over regenerated catalyst and spent catalyst show that under relatively high reaction temperature and high WHSV,cracking reactions are favored to enhance LPG yield for the former, and under relatively low reaction temperature and low WHSV, hydrogen transfer reactions are favored to increase gasoline yield for the latter. By proper adjusting the ratios of bimolecular cracking reactions to hydrogen transfer reactions,the product slates of FCC process could be more flexible and various.