摘要
对丁烯催化脱氢和氧化脱氢制丁二烯两种反应体系进行了热力学分析，得到反应的标准摩尔焓变△rHm^∞、标准摩尔吉布斯自由能变△rQm^∞和标准平衡常数Kp^∞等基础数据，考察了温度、压力和水烯比等对催化脱氢反应平衡转化率的影响，以及空气中氧气浓度、水烯比和副反应对氧化脱氢反应绝热温升的影响。结果表明：丁烯催化脱氢单程转化率低，高温、低压、高水烯比有利于提高平衡转化率；丁烯氧化脱氢为强放热反应，绝热温升较大，采用空气、高水烯比和高选择性可降低反应的绝热温升。
Thermodynamic analysis on butene to butadiene via two reaction processes of catalytic dehydrogenation and oxidative dehydrogenation was carried out and the thermodynamic data including standard molar enthalpy change △rHm^∞, standard molar Gibbs free energy change△rHm^∞ and standard equilibrium constant Kp^∞ were calculated. Then for catalytic dehydrogenation reaction the effects of temperature, pressure and molar ratio of water to paraffin on the equilibrium conversion of butene and the effects of the oxygen concentration, molar ratio of water to paraffin and the side reaction on the adiabatic temperature rise in the oxidative dehydrogenation reaction were researched. The results showed that the single-way conversion of butene in catalytic dehydrogenation was low. Higher temperature, higher molar ratio of water to paraffin and lower pressure were conducive to improve the equilibrium conversion rate. The oxidative dehydrogenation of butene is a strong exothermic reaction. Moreover, the adiabatic temperature rise of the reaction was quite high, which can be decreased through controlling molar ratio of water to paraffin, reaction selectivity and air.
出处
《精细石油化工》
CAS
CSCD
北大核心
2015年第6期63-67,共5页
Speciality Petrochemicals
关键词
催化脱氢
氧化脱氢
丁二烯
热力学分析
catalytic dehydrogenation
oxidative dehydrogenation
butadiene
thermodynamic analysis
