α-蒎烯+β-蒎烯+对伞花烃常压汽液平衡测定与关联

采用改进的Ellis平衡釜测定了在常压(100.7 kPa)下三个二元物系α-蒎烯＋β-蒎烯(428.82 K ~ 438.13 K)，α-蒎烯＋对伞花烃(429.05 K ~ 447.15 K)，β-蒎烯＋对伞花烃(439.20 K ~ 448.66 K)和一个三元物系α-蒎烯＋β-蒎烯＋对伞花烃(432.17 K ~ 448.11 K)的汽液相平衡数据,并利用Herington规则，以积分检验法对实验数据进行了热力学一致性检验。选用Wilson、NRTL、UNIQUAC和UNIFAC活度系数方程进行关联和估算，用最小二乘法求出二元物系的最佳配偶液相活度系数模型的能量参数，并比较了汽相组成的计算值与实验值，其平均相对偏差均小于0.40 %。将得到的最佳Wilson二元模型参数直接用于该体系三元体系汽液相平衡数据的预测，计算的平衡温度与实验测得的平衡温度平均偏差为0.16 K。

Determination and correlation of atmospheric VLE data of α-pinene + β-pinene + p-cymene

The vapor-liquid equilibrium(VLE) data of α-pinene+β-pinene (428. 82—438. 13 K),α-pinene+p-cymene (429. 05—447. 15 K), β-pinene+p-cymene (439. 20—448. 66 K) and α-pinene+β-pinene+p-cymene (432. 17—448. 11 K) were determined at atmospheric pressure (100. 7 kPa) with the modified Ellis still. The thermodynamic consistency of the experimental data was confirmed by means of the Herington method. Three activity coefficient models, Wilson, NRTL, UNIQUAC，were used to correlate and calculate the VLE data of these binary systems to obtain the binary parameters. Average relative deviations between calculated values and experimental data of vapor phase mole fraction were all less than 0. 40%.The binary parameters of Wilson equation were also used to calculate the bubble point and the vapor phase composition for the ternary mixture without any additional adjustment. The predicted VLE for the ternary system was in good agreement with the experimental results.