Abstract: The vapor and liquid equilibrium data for N2 - G2H6- CO2 ternary system were measured at temperature 220.00 - 253.15 K and pressure 3.00 - 5.00 MPa. The experimental results were compared with the data calculated with equations of state PR, SRK and LKP. The experimental data were used to determine the optimal binary interaction coefficients kij for these equations of state. All of these equations gave satisfactory results with optimal kij. For all of 105 experimental points the arithmetic average error between experimental and calculated vaper composition data Δγ is 0.0064 for N2, 0.0035 for C2H6, 0. 0050 for CO2 and the error between experimental and calculated pressure data Δp ·p-1 is 1.7 % .

摘要： 在低温条件下测定了N_2C_2H_6CO_2系统的汽液平衡。所测数据的温度范围为220.00～253.15K,压力范围为2.00～5.00MPa。实验数据以常用的几个状态方程RKS、PR以及LKP来检验,结果令人满意,实验结果并被用来对以上3个状态方程中二元相互作用系数进行了优选。对于全部105个测量点的汽相组成,实验值和计算值之差的算术平均值分别为0.0064（N_2）,0.0039(C_2H_6）,0.0050（CO_2）,压力实验值和计算值的算术平均相对误差为1.7％。