【摘要】 采用BT2．15型Calvet微量量热计常压下测定了α-蒎烯+对伞花烃和β-蒎烯+对伞花烃两个二元体系在298．15 K、308．15 K及318．15 K下的超额焓．实验数据采用Redlich-Kister方程进行关联,标准偏差较小．该两个二元体系的超额焓在全浓度范围内均为正值,其最大值在摩尔分数x1=0．5附近．温度对超额焓有一定的影响,超额焓随温度的升高而增大．相同温度下,α-蒎烯+对伞花烃体系的超额焓比β-蒎烯+对伞花烃体系的大．更多还原

【Abstract】 The excess enthalpies ofα-pinene+p-cymene andβ-pinene+ p-cymene binary systems were determined at 298.15 K, 308.15 K and 318.15 K and at atmospheric pressure by using a Calvet microcalorimeter (BT2.15). The experimental excess enthalpy data were correlated with Redlich-Kister equation and the standard deviations were all very small. It was found that all the excess enthalpies of these two binary systems were positive in the range of the experimental concentrations and reach their maxima when the mole concentration x1 was about 0.5. The excess enthalpies were larger at the higher mixing temperatures. At the same temperatures, the excess enthalpies ofα-pinene+p-cymene system were larger than that ofβ-pinene+p-cymene.更多还原