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工质纯度是影响高精度流体热物性实验可靠性的重要因素之一。该文以丙烷族氢氟烃类工质1,1,1,3,3,3-六氟丙烷(HFC-236fa)为例,研究了工质成分分析和纯化方法,采用液氮除气及移除富含杂质相态工质的实验操作,有效降低实验工质内各类不凝性及可凝性杂质的含量。采用气相色谱仪定量分析了纯化过程中杂质的变化规律,通过气相色谱-质谱联用系统确定了主要杂质的种类,应用理想溶液模型计算了杂质对工质热物理性质的影响。开展了丙烷及HFC-236fa的饱和蒸气压实验。结果表明,经纯化后不同来源实验工质的饱和蒸气压实验结果具有较高的一致性。
The purity of working fluid is one of the important factors affecting the experimental reliability of high-precision fluid thermophysical properties. In this paper, the working fluid composition analysis and purification method of 1,1,1,3,3,3-hexafluoropropane (HFC-236fa) as an example, Removal of impurity-rich phase of the working conditions of the experimental operation, effectively reduce the experimental working fluid of various non-condensable and condensable impurities. Gas chromatography was used to quantitatively analyze the variation of impurities in the purification process. The main impurities were identified by gas chromatography-mass spectrometry (GC-MS) system. The effects of impurities on the thermophysical properties of the working fluid were calculated by the ideal solution model. Saturated vapor pressures of propane and HFC-236fa were carried out. The results show that the saturated vapor pressure experimental results of different experimental sources have high consistency after purification.