Abstract In this paper, the isothermal vapour-liquid equilibrium (VLE) data for pure difluoromethane (R32) and trifluoroiodomethane (R13I1) and their binary mixtures have been measured based on a vapour – phase single recirculation method. The data were collected for five temperatures from 253.150 K to 293.150 K. The experimental VLE data were regressed by PR-MHV2-NRTL model and PR-vdW model. The deviation curves of pressures and vapour compositions for the binary system between experimental and calculated values were given. The results indicated that the maximum mean absolute relative deviation of pressure (MARDp) for PR-MHV2-NRTL is 0.54%, which shows a better fit than PR-vdW with a maximum MARDp of 2.73%. The maximum mean absolute deviation of vapour phase mole fraction (MADy) for PR-MHV2-NRTL and PR-vdW are 0.013 and 0.010, respectively. The azeotropic behaviours were found at T = (253.150, 263.150, 273.150) K, while the zeotropic behaviours were found at 283.150 K and 293.150 K.

中文翻译：

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（二氟甲烷 + 三氟碘甲烷）在 253.150 K 至 293.150 K 温度范围内的等温汽液平衡

摘要 在本文中，基于汽相单循环法测量了纯二氟甲烷 (R32) 和三氟碘甲烷 (R13I1) 及其二元混合物的等温汽液平衡 (VLE) 数据。收集了从 253.150 K 到 293.150 K 的五个温度的数据。实验 VLE 数据通过 PR-MHV2-NRTL 模型和 PR-vdW 模型进行回归。给出了实验值与计算值之间二元体系压力和蒸气组成的偏差曲线。结果表明，PR-MHV2-NRTL 的最大平均绝对压力相对偏差 (MARDp) 为 0.54%，这显示出比 PR-vdW 更好的拟合，最大 MARDp 为 2.73%。PR-MHV2-NRTL 和 PR-vdW 的气相摩尔分数 (MADy) 的最大平均绝对偏差分别为 0.013 和 0.010。