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.Key Laboratory of Thermo-Fluid Science and Engineering, Ministry of Education, Xi’an Jiaotong University, Xi’an, Shaanxi, China 710049)
(2.School of Physical Science and Technology, Xinjiang University, Urumqi, Xinjiang, China 830000)

【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 showed that the diffusion coefficients and Henry’s constants of six hydrofluorocarbons in [HMIM][PF6] increased with the increasing temperature. Compared with other five hydrofluorocarbons, R32 not only exhibited higher solubility but also higher diffusivity. Therefore, R32 + [HMIM][PF6] was 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.

【Keywords】 pressure decay technique; diffusion coefficient; Henry’s constant; ionic liquid; hydrofluorocarbon;

【DOI】

【Funds】 National Science Fund for Distinguished Young Scholars of China (51525604)

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(Translated by KANG GD)

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This Article

ISSN:0438-1157

CN: 11-1946/TQ

Vol 68, No. 12, Pages 4486-4493+4462

December 2017

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Article Outline

Abstract

  • Introduction
  • 1 Experimental methods
  • 2 Results and discussion
  • 3 Conclusion
  • Nomenclature
  • References