摘要
对丙烷脱氢反应进行了热力学分析,计算了不同温度下的标准平衡常数和不同条件下的平衡转化率,并通过实验研究了不同工艺条件对Pt-Sn-K/Al2O3催化剂活性的影响。结果表明:高温和低压有利于反应的进行,但温度过高会导致裂解等副反应增多,使丙烯选择性下降,压力过低会造成脱氢反应产生的积炭前身物增多,催化剂失活速率加快;低空速下物料在反应器中停留时间较长,高温裂解反应增多,导致丙烯选择性下降;提高氢烃比能够降低催化剂的积炭速率,但同时也会降低丙烷的转化率。
Thermodynamic analysis was carried out for the reaction of propane dehydrogenation, and the standard equilibrium constants and the equilibrium conversion under different conditions were calculated. In addition, the influence of operating conditions on the performance of the catalyst was studied. The results showed that high temperature and low pressure are favorable to the dehydrogenation reaction. But higher temperature and lower pressure will cause cracking reactions and formation of more coke precursor. Low space velocity makes the residence time of reactants in the reactor longer, resulting in increase of cracking reactions and decrease of selectivity. The higher of hydrogen over hydrocarbon ratio can reduce coking rate on the catalyst and is good for the conversion of propane.
出处
《石油炼制与化工》
CAS
CSCD
北大核心
2013年第4期34-38,共5页
Petroleum Processing and Petrochemicals
关键词
丙烷
丙烯
催化脱氢
转化率
工艺条件
propane
propylene
catalytic dehydrogenation
conversion
operating conditions
