邻苯二酚与甲醇合成愈创木酚的热力学分析

邻苯二酚与甲醇气相单醚化合成愈创木酚因经济、环保、原料廉价易得、可实现连续化生产等优点而备受关注。为了有效利用资源，对该反应过程进行了较为详细的热力学分析。根据邻苯二酚(catechol)、甲醇、愈创木酚(guaiacol)及水的标准摩尔生成焓Δ_fH^θ_m、标准熵变ΔS^θ_m和热熔C_p,m等热力学数据，讨论了温度对邻苯二酚与甲醇气相合成愈创木酚反应的焓变Δ_rH_m、自由能变Δ_rG_m及平衡常数K的影响。结果表明，在400～800 K温度范围内，该反应是一个放热自发反应，可在较低温度下顺利进行，有较大反应平衡常数。因此，该反应的研究关键主要是较低温度下高活性催化剂的研发和最适宜反应条件的选择。

Thermodynamic Analysis of Reaction for Synthesis of Guaiacol from Catechol and Methanol

Due to the economic,environmental,cheap materials,which can realize continuous production,etc,the guaiacol synthezied by catechol and methanol via gas phase monoether reaction has attracted much attention.In order to effectively use of resources,the reaction process was discussed by thermodynamic analysis in detail.Based on the standard enthalpy of formation（ΔfHθm）,the standard entropy of formation（ΔSθm） and the heat capacity（Cp,m） of catechol,methanol,guaiacol and water,the thermodynamic data on the vapor-phase synthesis of guaiacol with catechol and methanol at 400—800 K were calculated,including reaction enthalpy（ΔrHm）,Gibbs free energy（ΔrGm） and equilibrium constant（K）.Then,the relationship between temperature and the above three variables were studied.According to the calculation,in the range of 400—800 K,the reaction is exothermic and spontaneous,also have higher equilibrium constants.The results showed that it was important for optimization of reaction process as well as the design of catalysts over the gas-phase synthesis of guaiacol at lower temperatures.