导热系数是有机物的重要物性数据之一,也是化工过程模拟与优化建模中不可或缺的参数。尽管文献中有部分化合物导热系数的实验值,但很多物质的导热系数不能由实验获得,往往是通过建立数学模型来估算。这里主要对估算低压纯气体导热系数的方法进行了归纳和研究,并对一些方法存在的问题进行了说明及改进。主要介绍了Chung法、Eucken关系式法、改进的Eucken关系式法和Stiel-Thodos法的原理、优缺点及应用范围;并利用这些方法估算了100种化合物的导热系数值,将这些估算值再与温度关联式所计算的结果进行比较。结果表明Chung法是估算导热系数较之其它精确。同时对Chung法进行改进,得到Chung法的18种常用酸性化合物的k值,扩大了方法的应用范围。 Thermal conductivity is one of the important physical properties of organic matter and is an indispensable parameter in chemical process simulation and optimization modeling. Although there are experimental values ​​for the thermal conductivity of some compounds in the literature, the thermal conductivity of many materials can not be obtained experimentally and are often estimated by establishing mathematical models. Here, the method of estimating the thermal conductivity of low-pressure pure gas is mainly summarized and studied, and the problems existing in some methods are described and improved. The methods of Chung method, Eucken relation method, improved Eucken relation method and Stiel-Thodos method are introduced. The thermal conductivity values ​​of 100 compounds are estimated by these methods. Compared with the calculated result of the temperature correlation. The results show that the Chung method is to estimate the thermal conductivity better than any other. Simultaneously, the Chung method is improved to obtain k values ​​of the 18 commonly used acidic compounds of Chung method, which expands the application range of the method.