棕榈酸甲酯及棕榈酸乙酯高温热物理性质的研究

为了获取两种脂肪酸酯类燃料棕榈酸甲酯和棕榈酸乙酯的热物理性质,并为将其作为燃料和燃料添加剂提供理论和试验数据支持,利用表面光散射法、振动管法和全反射法在较宽温区下分别研究了两种棕榈酸酯类的表面张力、黏度、密度和折射率。密度和折射率数据分别关联成了温度的多项式和线性函数,棕榈酸甲酯和棕榈酸乙酯的密度试验值与方程计算值平均绝对偏差分别为0.033%和0.013%,折射率试验值与方程计算平均偏差均为0.004%;黏度数据关联成了温度倒数的多项式,棕榈酸甲酯和棕榈酸乙酯的试验值与方程计算值平均绝对偏差分别为1.76%和2.30%;表面张力数据利用了van der Waals方程进行关联,棕榈酸甲酯和棕榈酸乙酯的试验值与方程计算值平均绝对偏差分别为0.86%和1.70%。

Study on Thermophysical Properties of Methyl Palmitate and Ethyl Palmitate at High Temperature

To provide theoretical basis and test data support for methyl palmitate and ethyl palmitate, which are two fatty acid esters, to be used as fuels or fuel additives in diesel engine, their thermophysical properties including surface tension, viscosity, density and refractive index were investigated in a wide temperature range by the surface light scattering, vibration tube and total reflection. The test data of the density and refractive index of both palmitates were correlated respectively as polynomial and linear functions of temperature. The average absolute deviations of density values calculated with the polynomial functions from the test data were 0.033% and 0.013% respectively, and both the average absolute deviations of refractive index values calculated with the liner function from the test data were 0.004%. The test data of the viscosities of both palmitates were correlated as polynomial functions of the reciprocal of temperature, and the average absolute deviations of these values calculated with the polynomial functions from the test data were 1.76% and 2.30% respectively. The test data of the surface tension of both palmitates were correlated as the van der Waals type functions, and the average absolute deviations of these values calculated with the van der Waals type functions from the test data were 0.86% and 1.70% respectively.