苄胺-乙腈-水体系导热系数的测量与计算

Measurement and calculation of thermal conductivity of the benzylamine-acetonitrile-water system

导热系数是流体的基础物理性质之一,苄胺-乙腈-水体系的导热系数对其相关反应的工业化开发具有重要意义。研究利用瞬态热线装置分别测定了苄胺-乙腈、苄胺-水、乙腈-水和苄胺-乙腈-水体系在288.15~318.15 K、常压条件下3种组分质量分数在0.1~0.9的导热系数。实验数据不确定度为±2.5%,覆盖因子k=2。运用二阶Scheffé多项式将二元体系导热系数拟合成关于温度和组成的方程,并与4种导热系数预测方程的预测结果进行了对比,多项式关联结果明显优于其他预测方程。因此用Scheffé多项式对苄胺-乙腈-水混合体系导热系数进行了预测,最大相对偏差和平均相对偏差分别为2.54%和0.68%。

Thermal conductivity is one of the basic physical properties of fluids,and the benzylamine-acetonitrile-water system is of great significance for related industrial development.In this study,the thermal conductivities of benzylamine-water system,benzylamine-acetonitrile system,acetonitrile-water system and benzylamine-acetonitrile-water system were separately measured by a transient hot-wire apparatus at 288.15~318.15 K under atmospheric pressure with concentration range of 0.1~0.9.The uncertainty of the experimental thermal conductivities was±2.5%and the coverage factor was k=2.The second-order Scheffépolynomial equation was used to correlate the experimental thermal conductivities as a function of temperature and composition.Compared with the predicted results for four different predictive models on thermal conductivity,the correlation results of polynomial were significantly better.Therefore,the Scheffépolynomial equation was used to estimate the thermal conductivities of the benzylamine-acetonitrile-water ternary system.The maximum absolute deviation and average absolute deviation were 2.54%and 0.68%,respectively.