PVTx Properties of Gaseous Mixtures of Difluoromethane and 1,1,1,2,3,3,3-Heptafluoropropane

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• 作者：Xiao-Juan Feng ; Yuan-Yuan Duan ; Wei Dong
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2007
• 出版时间：July 2007
• 年：2007
• 卷：52
• 期：4
• 页码：1354 - 1359
• 全文大小：93K
• 年卷期：v.52,no.4(July 2007)
• ISSN：1520-5134

文摘

Mixtures of difluoromethane (HFC-32) and 1,1,1,2,3,3,3-heptafluoropropane (HFC-227ea) are promising alternativerefrigerants; however, there is currently no available published experimental PVTx data. The gaseous PVTx propertiesof HFC-32 (1) + HFC-227ea (2) mixtures were measured using the Burnett-isochoric method with 251 data setsobtained for temperatures from (310 to 410) K, pressures up to 3658 kPa, and densities up to 206 kg·m^-3 at x₁= 0.2648, x₁ = 0.5155, and x₁ = 0.7809. The temperature, pressure, and mole fraction uncertainties were estimatedto be ±10 mK, ±100 Pa, and ±0.01 %, respectively. A truncated virial equation was used to correlate theexperimental data, with the second and third virial coefficients for the binary mixtures also determined.