By using the liquid state equation, an extrapolation method to predict the density of dimethyl carbonate (DMC) at different temperatures and pressures was put forward. Firstly, ten groups of pressure and density data of DMC at 283.15,313.15 and 343.15 K were tested. Then, the experimental data were substituted into the density equation put forward by Goharshadi, et al to fit the parameters of the equation by using the least square method. Finally, the density equation was used to predict densities of DMA at other temperatures (278.15-353.15 K) and pressures (0. 1-20 MPa).The calculated densities are quite agreed with the experimental densities at the same temperature and pressure. The most absolute error is less than O. 002 3 g/cm3, and the average absolute error is only O. 000 9 g/cm3. The calculated values by extrapolation method are accurate and reliable, and can be used for scientific research of dimethyl carbonate, which can greatly reduce the experimental cost and the labor intensity in test.%提出了利用液体状态方程测定不同温度、压强下碳酸二甲酯密度的外推法.首先实验测量出3种不同温度(283.15,313.15,343.15 K)下碳酸二甲酯的各10组压强和密度数据,然后运用Goharshadi等提出的密度方程对这些数据进行线性拟合,最后利用拟合出的方程参数外推计算了其他多种温度(278.15-353.15 K)和压强(0.1-20MPa)下碳酸二甲酯的密度值,并与相同条件下的实验测量值进行了比较,其最大偏差小于0.002 3 g/cm3,平均偏差仅为0.000 9 g/cm3,表明外推法的计算值准确、可靠,这为碳酸二甲酯的生产和科研提供了基础数据,并大大降低了实验费用和测试的劳动强度.
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