摘要
对醋酸、醋酸甲酯或醋酸乙酯加氢制乙醇进行了热力学计算和分析。计算了这3个反应的标准摩尔焓变和标准平衡常数,以及温度、压力和反应物配比对平衡转化率的影响。结果表明,3个反应的标准摩尔焓变都小于0,是放热反应;醋酸加氢反应的标准平衡常数较大,而醋酸甲酯加氢反应和醋酸乙酯加氢反应的标准平衡常数都小于0.7;醋酸加氢反应由于标准平衡常数较大,因此其平衡转化率受工艺条件影响较小,而醋酸甲酯加氢和醋酸乙酯加氢反应的平衡转化率受工艺条件的影响较大,醋酸酯加氢制乙醇反应适宜的温度为423~550 K,适宜的压力是2~3 MPa,适宜的氢酯比是10~20。
The thermodynamics of hydrogenation of acetic acid or acetic ester to ethanol had been ana- lyzed. The enthalpy changes and the standard equilibrium constants of the three reactions were calculated. The effects of temperature, pressure and the molar ratio of reagents on the equilibrium conversion of acetic acid or acetic ester were researched. The result shows that all the enthalpy changes of the three re- actions are less than 0, so the reactions are exothermic. The reaction conditions can not make a great in- fluence on the conversion of acetic acid, because the standard equilibrium constant is comparatively large. However, the reaction conditions make a great effect on the conversion of acetic esters due to their small standard equilibrium constants. For the hydrogenation of acetic ester to ethanol, the suitable reaction temperature is 423--550 K and the suitable reaction pressure is 2--3 MPa and the suitable molar ratio of hydrogen and acetic ester is 10--20.
作者
孙成伟
郭翠梨
叶陈良
Sun Chengwei Guo Cuili Ye Chenliang(School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, Chin)
出处
《化学工业与工程》
CAS
CSCD
2017年第2期45-49,95,共6页
Chemical Industry and Engineering
关键词
醋酸
醋酸酯
加氢
乙醇
热力学
acetic acid
acetic ester
hydrogenation
ethanol
thermodynamic
