异丁烷脱氢裂解制低碳烯烃

以异丁烷为原料，在固定床微反实验装置上考察了其在Cr2O3/Al2O3脱氢催化剂和HZSM-5催化剂组成的混合催化剂上脱氢裂解反应的情况。研究发现：两种催化剂在反应器中的分布状态以及Cr2O3/Al2O3催化剂的装填量都会对反应结果产生很大的影响，当两者均匀混合、Cr2O3/Al2O3催化剂的添加量为20%时，裂解反应效果最佳，转化率达到80.99%，三烯总收率为50.26%，其中乙烯、丙烯和丁烯的收率分别为12.42%，24.41%，13.43%；相比于单纯的HZSM-5催化剂，转化率提高了21.22百分点，三烯的选择性提高了2.57百分点。此外，反应过程中采用异丁烷和惰性稀释气（N2）混合进料时，反应效果更佳，而且随稀释比增大，优势更明显。

DEHYDROGENATION CRACKING OF i-BUTANE TO PRODUCE LIGHT OLEFINS

The dehydrogenation cracking of i-butane was studied over mixed catalysts comprised of Cr2O3/Al2O3 dehydrogenation catalyst and HZSM-5 catalyst in a fixed-bed reactor. The results demonstrate that conversion and product distribution vary signi?cantly depending on different location of Cr2O3/Al2O3 and HZSM-5 catalyst and the amount of Cr2O3/Al2O3 catalyst in the reactor, and the reaction performance is the best when two kinds of catalysts are homogeneously mixed. On the mixed catalyst HZSM-5 with a 20% Cr2O3/Al2O3, the conversion of reaction is 81%, and the yield of ethylene, propylene and butylene is 12.4%, 24.1% and 13.4%, respectively. The conversion increases by 21% and the selectivity of total olefins (ethylene, propylene and butylene) increases by 2.57%, compared with the pure HZSM-5. Besides, i-butane mixed with N2 enters the reactor at a fixed residence time of i-butane, the reaction results become better, and the advantage are more obvious as dilution ratio increases.