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天然气中常含有少量CO2气体。文章介绍低温下小分子量烃类混合物中CO2饱和浓度的理论计算方法，在计算过程中运用了能够准确反映气液相平衡的热力学状态方程。对于其它溶解物，只要可以准确得出固－气相平衡压力关系，该方法仍可实用。最后，将运用本方法所得计算结果与一些已有实验结果进行了比较，证明本方法用于LNG、LPG可以得到很好的结果。

Calculation of CO2 Saturation Concentration in Light Hydrocarbon Mixture at Low Temperature

There is a little carbon dioxide gas i n natural gas.A theoretical calculation method of CO 2 saturation concentratio n in light hydrocarbon mixture at low temperature is proposed in the paper.The t hermodynamic state equation which can accurately express vapor liquid phase equ ilibrium condition is utilized in calculating.This method may be also used for a ny other solute as long as its solid vapor phase equilibrium pressure relation can be accurately acquired.Through comparing the results calculated by this meth od with those experimented,it is proved that when this method is used for LNG an LPG,an ideal result may be obtained.