The Studies On Synthesis Reaction Of Ethyl Cinnamate And Thermodynamic Properties Analysis

In this paper, the synthesis reaction of ethtyl cinnamate and related thermodynamic properties were studied.The esterification reaction of t-CA and ethanol was studied, in which the p-toluene sulphonic acid as catalyst. The preparation technology was optimized by the orthogonal experiment and single-factor test. The result showed that the yield is up to 86% when the optimal process condition is as follows:reaction temperature is 80 ℃, reaction time is 5h, ratio of ethanol with t-CA and catalyst is 8:1:0.12.In this work, the solubilities of trans-cinnamic acid (t-CA) in methanol, ethanol, propanol, n-butanol, isopropyl alcohol, and isobutyl alcohol were measured at temperature ranging from 283.15 to 333.15K by dynamic method, then the modified Apelblat equation, the λh equation and activity coefficient models (NRTL and UNIQUAC) were used to correlated these measurements. The modified Apelblat equation and the NRTL obtain better agreement with experimental result. In addition, the values of Gibbs energy, standard enthalpy, and standard entropy for the solution process were evaluated by the van’t Hoff analysis. Furthermore, the thermodynamic excess functions (GE, SE, HE) of t-CA+alcohols system were determined through NRTL model.Furthermore, the kinetics of esterification was studied. The kinetics equation was established by analyzing the data obtained in homogeneous environment.The heat capacity of t-CA and ethyl cinnamte among 288.21K to 373.26K were obtained by adiabatic calorimeter. The available correlations of Cp-T were also obtained in this temperature range. Typical thermodynamic method were used to estimated the standard formation AfH0(l,298.15K) and standard entropy S0(l,298.15 K) of the ethyl cinnamte. Moreover, the availability of this estimation was verified by a thermodynamic circle and experimental equilibrium constant. The results suggested that this estimation were available.