在中试循环流化床装置上,采用自主研发的PBD型低碳烷烃脱氢催化剂,对丙烷/异丁烷混合烷烃进行催化脱氢实验,考察了反应温度、气态空速、原料配比等工艺条件对脱氢过程的影响.实验结果表明,PBD型催化剂对丙烷/异丁烷混合烷烃脱氢反应表现出较高的催化活性.随反应温度的升高,混合烷烃的转化率增加,混合烯烃(丙烯+异丁烯)的选择性逐渐下降,收率逐渐增加.随气态空速的增大,混合烷烃的转化率下降,混合烯烃(丙烯+异丁烯)的选择性增加,而收率逐渐减小.其中,在反应温度600 ℃、气态空速1 700 h-1、丙烷含量20%(w)、异丁烷含量在80%(w)的条件下,总烷烃转化率达48%以上,总烯烃选择性约90%.%A catalytic dehydrogenation experiment on an alkane mixture of propane and isobutane in the presence of a PBD low-carbon alkane dehydrogenation catalyst for fluidized-bed dehydrogenation developed by Yantai University was carried out on a pilot-scale circulating fluidized bed apparatus, where effects of operating conditions,such as reaction temperature,GHSV and raw material proportions,on the dehydrogenation process were systematically investigated. Experimental findings indicated that the PBD catalyst showed high catalytic activity for the dehydrogenation of low-carbon alkanes. As the reaction temperature increased,the conversion of alkanes improved with gradually reduced selectivity of mixed olefins(propylene+isobutene) and gradually increased yield. With the GHSV increased,the conversion of the alkane mixture was decreased with increased selectivity of mixed olefins(propylene+isobutene) and gradually reduced yield. Especially,under the conditions of 600 ℃,GHSV 1 700 h-1,propane content 20%(w) and isobutane content 80%(w) the total conversion of the alkanes was 48% and above and the total selectivity of the olefins was about 90%.
展开▼
