化工学报 ›› 2017, Vol. 68 ›› Issue (12): 4486-4493.DOI: 10.11949/j.issn.0438-1157.20170589

• 热力学 • 上一篇    下一篇

氢氟烃在离子液体[HMIM][PF6]中的扩散系数和亨利常数

刘向阳1, 潘培1, 彭三国1, 何茂刚1, 贺永东2   

  1. 1 西安交通大学热流科学与工程教育部重点实验室, 陕西 西安 710049;
    2 新疆大学物理科学与技术学院, 新疆 乌鲁木齐 830000
  • 收稿日期:2017-05-10 修回日期:2017-09-27 出版日期:2017-12-05 发布日期:2017-12-05
  • 通讯作者: 何茂刚
  • 基金资助:

    国家杰出青年科学基金项目(51525604)。

Diffusion coefficients and Henry's constants of six hydrofluorocarbons in ionic liquid [HMIM] [PF6]

LIU Xiangyang1, PAN Pei1, PENG Sanguo1, HE Maogang1, HE Yongdong2   

  1. 1 Key Laboratory of Thermo-Fluid Science and Engineering, Ministry of Education, Xi'an Jiaotong University, Xi'an 710049, Shaanxi, China;
    2 School of Physical Science and Technology, Xinjiang University, Urumqi 830000, Xinjiang, China
  • Received:2017-05-10 Revised:2017-09-27 Online:2017-12-05 Published:2017-12-05
  • Supported by:

    supported by the National Science Fund for Distinguished Young Scholars of China (51525604).

摘要:

氢氟烃+离子液体是一种非常有潜力的吸收式制冷循环工质对。利用压力衰减法测量了303.15~343.15 K范围内6种氢氟烃(R32、R125、R161、R143a、R1234yf、R152a)在离子液体1-已基-3-甲基咪唑(钅翁)六氟磷酸盐([HMIM][PF6])中的扩散系数和亨利常数。结果表明:6种氢氟烃在[HMIM][PF6]中的扩散系数和亨利常数均随着温度的升高而增大。在6种氢氟烃中,因R32在[HMIM][PF6]中具有较大的溶解度和扩散系数,所以R32+[HMIM][PF6]较适合作为吸收式制冷循环的工质对。最后,采用Arrhenius方程对6种氢氟烃在[HMIM][PF6]中的扩散系数和亨利常数进行了关联,计算结果与实验数据的平均绝对相对偏差分别小于2.5%和6.0%。

关键词: 压力衰减法, 扩散系数, 亨利常数, 离子液体, 氢氟烃

Abstract:

Hydrofluorocarbon + ionic liquid is a potential working pair for the absorption refrigeration cycle. A pressure decay technique was used to measure the diffusion coefficients and Henry's constants of six hydrofluorocarbons (R32, R125, R161, R143a, R1234yf and R152a) in 1-hexyl-3-methylimidazolium hexafluorophosphate ([HMIM] [PF6]) in the temperature range from 303.15 K to 343.15 K. The experimental results show that the diffusion coefficients and Henry's constants of six hydrofluorocarbons in [HMIM] [PF6] increase with the increasing temperature. Compared with other five hydrofluorocarbons, R32 not only exhibits higher solubility but also higher diffusivity. Therefore, R32 + [HMIM] [PF6] is very suitable for the absorption refrigeration cycle. The Arrhenius equation was applied to correlate the diffusion coefficients and Henry's constants of six hydrofluorocarbons in [HMIM] [PF6]. The average absolute relative deviations between the calculated results and the experimental data were less than 2.5% and 6.0%, respectively.

Key words: pressure decay technique, diffusion coefficient, Henry's constant, ionic liquid, hydrofluorocarbon

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