TY - JOUR
T1 - Measurement of critical parameters for the binary mixture of R744 (carbon dioxide) + R1234yf (2,3,3,3-tetrafluoropro-1-ene)
AU - Yao, Xiaoyu
AU - Shen, Jun
AU - Kang, Hui Fang
AU - Li, Zhenxing
AU - Dong, Xueqiang
AU - Gong, Maoqiong
N1 - Publisher Copyright:
© 2022 Elsevier Ltd
PY - 2023/3
Y1 - 2023/3
N2 - The critical parameters including critical temperature, critical pressure, critical densities, and mole fraction for the binary mixture of R744 (carbon dioxide) + R1234yf (2,3,3,3-tetrafluoropro-1-ene) mixture were measured using a metal-bellows variable volumeter. The critical point was determined by visually observing the critical opalescence and reappearance of the meniscus. The expanded combined uncertainties of the critical temperature, critical pressure, critical density, and composition measurements were assessed to be less than 50 mK, 21 kPa, 0.006, and 0.015 (k = 2, 0.95 level of confidence), respectively. The experimental critical properties for the mixture correlated by Redlich-Kister equations were 0.15 % for critical temperature, 0.46 % for critical pressure, 0.10 % for critical density, and 0.08 % for critical molar volume. The mixture formed by mixing about 0.15 M fraction of R1234yf can increase the critical temperature by about 20 K and reduce the critical pressure by about 0.4 MPa compared with the pure material of CO2.
AB - The critical parameters including critical temperature, critical pressure, critical densities, and mole fraction for the binary mixture of R744 (carbon dioxide) + R1234yf (2,3,3,3-tetrafluoropro-1-ene) mixture were measured using a metal-bellows variable volumeter. The critical point was determined by visually observing the critical opalescence and reappearance of the meniscus. The expanded combined uncertainties of the critical temperature, critical pressure, critical density, and composition measurements were assessed to be less than 50 mK, 21 kPa, 0.006, and 0.015 (k = 2, 0.95 level of confidence), respectively. The experimental critical properties for the mixture correlated by Redlich-Kister equations were 0.15 % for critical temperature, 0.46 % for critical pressure, 0.10 % for critical density, and 0.08 % for critical molar volume. The mixture formed by mixing about 0.15 M fraction of R1234yf can increase the critical temperature by about 20 K and reduce the critical pressure by about 0.4 MPa compared with the pure material of CO2.
KW - 2,3,3,3-Tetrafluoropro-1-ene
KW - Carbon dioxide
KW - Critical density
KW - Critical parameters
KW - Metal-bellows volumeter
KW - Variable-volume method
UR - http://www.scopus.com/inward/record.url?scp=85144072912&partnerID=8YFLogxK
U2 - 10.1016/j.jct.2022.106978
DO - 10.1016/j.jct.2022.106978
M3 - Article
AN - SCOPUS:85144072912
SN - 0021-9614
VL - 178
JO - Journal of Chemical Thermodynamics
JF - Journal of Chemical Thermodynamics
M1 - 106978
ER -