2
0
2017
aho
ren
0
journal
Original
Ahosseini, A.[Azita]
Ren, W.[Wei]
Weatherley, L. R.[Laurence R.]
Scurto, A. M.[Aaron M.]
Fluid Phase Equilib.
2017
2020-09-29
Viscosity and self-diffusivity of ionic liquids with compressed hydrofluorocarbons: 1-hexyl-3-methyl-imidazolium bis(trifluoromethylsulfonyl)amide and 1,1,1,2- tetrafluoroethane.
The viscosity and self-diffusivity of mixtures of the ionic liquid, 1-hexyl-3- methylimidazolium bis(trifluoromethylsulfonyl)amide ([HMIm][Tf2N]), and the compressed gas, 1,1,1,2-tetrafluoroethane (R-134a), were measured at three different temperatures (298.15 K, 323.15 K, 343.15 K) and pressures to 21 bar. The high-pressure vapor-liquid equilibrium (VLE) of the ionic liquids with R-134a was measured to calculate the composition of the liquid phase at the various pressures encountered in the viscosity and diffusivity measurements. The viscosity of the ionic liquid decreases significantly with increased composition of R-134a at VLE. The excess viscosity demonstrates positive values that are believed to represent relatively strong intermolecular forces of the polar R-134a and [HMIm][Tf2N]. The self-diffusivity of mixtures of [HMIm][Tf2N] and liquefied R-134a (298.15 K and 6.7 bar) was measured and increases significantly with increases in the composition of R-134a. The selfdiffusivity of [HMIm][Tf2N] in vapor-liquid equilibrium with compressed R-134a gas was measured and indicates similar increases in diffusivity with composition of R-134a. The diffusivity demonstrates close Stokes-Einstein behavior using the measured mixture viscosity data and ambient pressure self-diffusivity.
Compressed hydrofluorocarbon gas
Imidazolium ionic liquids
Viscosity
Self-diffusivity
1, 1, 1, 2-Tetrafluoroethane (R-134a).
10.1016/j.fluid.2016.11.022
437
34-42
1
InChI=1S/C2H2F4/c3-1-2(4,5)6/h1H2
LVGUZGTVOIAKKC-UHFFFAOYSA-N
1,1,1,2-tetrafluoroethane
1,2,2,2-tetrafluoroethane
Freon 134a
R-134a
C2H2F4
1
Commercial source
1
99.99
4
Stated by supplier
2
InChI=1S/C10H19N2.C2F6NO4S2/c1-3-4-5-6-7-12-9-8-11(2)10-12;3-1(4,5)14(10,11)9-15(12,13)2(6,7)8/h8-10H,3-7H2,1-2H3;/q+1;-1
RCNFOZUBFOFJKZ-UHFFFAOYSA-N
1-hexyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]imide
1-hexyl-3-methylimidazolium 1,1,1-trifluoro-N-[(trifluoromethyl)sulfonyl]methanesulfonamide
1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide
1-hexyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]amide
1-hexyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]imide [HMIM][NTf2]
[c6mim][ntf2]
C12H19F6N3O4S2
1
Synthesized by the authors
1
99
2
NMR (proton)
2
0.0125
3
Karl Fischer titration
3
0.0008
1
Ion-selective electrode
1
1
1
Principal objective of the work
VVD
TRC
6/6/2017
1
Self diffusion coefficient, m2/s
NMR
Liquid
Direct value, X
1
Data file compiler
Propagation of evaluated standard uncertainties
95
Liquid
1
Pressure, kPa
Liquid
2
Temperature, K
Liquid
1
670
2
2
298.15
5
1
5.949e-09
4
1
0.595
2
2
1
Principal objective of the work
VVD
TRC
6/6/2017
1
Viscosity, Pa*s
Oscillating piston [Cambridge Applied Systems Model]
Liquid
Direct value, X
1
Data file compiler
Propagation of evaluated standard uncertainties
95
Liquid
1
Pressure, kPa
Liquid
2
Temperature, K
Liquid
1
100
1
2
343.15
5
1
0.01407
4
1
0.00035
3
2
1
Principal objective of the work
VVD
TRC
6/6/2017
1
Self diffusion coefficient, m2/s
NMR
Liquid
Direct value, X
1
Data file compiler
Propagation of evaluated standard uncertainties
95
Liquid
1
Pressure, kPa
Liquid
100
1
1
Temperature, K
Liquid
1
298.15
5
1
1.79e-11
3
1
0.0083
1
323.15
5
1
5.54e-11
3
1
0.01
1
343.15
5
1
1.066e-10
4
1
0.0146
4
1
1
2
1
Principal objective of the work
VVD
TRC
6/5/2017
1
Viscosity, Pa*s
Oscillating piston [Cambridge Applied Systems Model]
Liquid
Direct value, X
1
Data file compiler
Propagation of evaluated standard uncertainties
95
Liquid
1
Temperature, K
Liquid
343.15
5
1
Pressure, kPa
Liquid
2
Mole fraction
1
Liquid
1
100
1
2
0
4
1
0.01407
4
1
0.00035
1
310
2
2
0.148
3
1
0.01262
4
1
0.00031
1
610
2
2
0.276
3
1
0.01197
4
1
0.00133
1
850
2
2
0.364
3
1
0.00933
3
1
0.00156
1
1130
3
2
0.459
3
1
0.00809
3
1
0.00018
1
1470
3
2
0.575
3
1
0.00706
3
1
0.0003
1
2030
3
2
0.813
3
1
0.00324
3
1
7e-05
5
1
1
2
1
Principal objective of the work
VVD
TRC
6/6/2017
1
Tracer diffusion coefficient, m2/s
NMR
1
Liquid
Direct value, X
1
Data file compiler
Propagation of evaluated standard uncertainties
95
Liquid
1
Pressure, kPa
Liquid
670
2
2
Temperature, K
Liquid
298.15
5
1
Mole fraction
1
Liquid
1
0.3
2
1
0.186
3
1
0.019
1
0.5
2
1
0.308
3
1
0.032
1
0.7
2
1
0.522
3
1
0.114
1
0.98
2
1
4.986
4
1
0.693
1
1
3
1
5.949
4
1
0.595
1
0
3
1
0.179
3
1
0.018
6
1
1
2
1
Principal objective of the work
VVD
TRC
6/5/2017
1
Tracer diffusion coefficient, m2/s
NMR
2
Liquid
Direct value, X
1
Data file compiler
Propagation of evaluated standard uncertainties
95
Liquid
1
Pressure, kPa
Liquid
2
Temperature, K
Liquid
3
Mole fraction
1
Liquid
1
100
1
2
298.15
5
3
0
3
1
0.0179
3
1
0.0083
1
315
3
2
298.15
5
3
0.42
2
1
0.025
3
1
0.0084
1
419
3
2
298.15
5
3
0.55
2
1
0.0255
3
1
0.0084
1
100
1
2
323.15
5
3
0
3
1
0.0554
3
1
0.01
1
314
3
2
323.15
5
3
0.23
2
1
0.0686
3
1
0.0116
1
412
3
2
323.15
5
3
0.3
2
1
0.0697
3
1
0.012
1
515
3
2
323.15
5
3
0.36
2
1
0.0685
3
1
0.012
1
100
1
2
343.15
5
3
0
3
1
0.1066
4
1
0.0146
1
406
3
2
343.15
5
3
0.19
2
1
0.1291
4
1
0.0165
1
511
3
2
343.15
5
3
0.24
2
1
0.1315
4
1
0.0167
1
608
3
2
343.15
5
3
0.28
2
1
0.1341
4
1
0.017
7
1
1
2
1
Principal objective of the work
VVD
TRC
6/5/2017
1
Vapor or sublimation pressure, kPa
Closed cell (Static) method
Gas
Direct value, X
1
Data file compiler
Propagation of evaluated standard uncertainties
95
Gas
Liquid
1
Temperature, K
Liquid
343.15
5
1
Mole fraction
1
Liquid
1
0.0397
3
1
84
2
1
14
1
0.1086
4
1
212
3
1
14
1
0.1956
4
1
395
3
1
16
1
0.2904
4
1
615
3
1
18
1
0.4272
4
1
971
3
1
23
1
0.5508
4
1
1320
3
1
30
1
0.6867
4
1
1732
4
1
36
1
0.777
4
1
1956
4
1
40
1
0.8075
4
1
2016
4
1
41
1
0.8427
4
1
2064
4
1
42
1
0.8572
4
1
2075
4
1
42
8
1
1
2
1
Principal objective of the work
VVD
TRC
6/5/2017
1
Molar volume, m3/mol
High-pressure cell with syringe pump
Liquid
Direct value, X
1
Data file compiler
Propagation of evaluated standard uncertainties
95
Liquid
1
Temperature, K
Liquid
343.15
5
1
Pressure, kPa
Liquid
2
Mole fraction
1
Liquid
1
84
2
2
0.0397
3
1
0.0003358
4
1
3.2e-06
1
212
3
2
0.1086
4
1
0.0003159
4
1
2.8e-06
1
395
3
2
0.1956
4
1
0.0002928
4
1
2.6e-06
1
615
3
2
0.2904
4
1
0.0002669
4
1
2.2e-06
1
971
3
2
0.4272
4
1
0.0002313
4
1
1.8e-06
1
1320
3
2
0.5508
4
1
0.0001984
4
1
1.4e-06
1
1732
4
2
0.6867
4
1
0.0001653
4
1
1e-06
1
1956
4
2
0.777
4
1
0.0001436
4
1
8e-07
1
2016
4
2
0.8075
4
1
0.0001367
4
1
6e-07
1
2064
4
2
0.8427
4
1
0.0001289
4
1
6e-07
1
2075
4
2
0.8572
4
1
0.0001265
4
1
4e-07
9
1
1
2
1
Principal objective of the work
VVD
TRC
6/5/2017
1
Vapor or sublimation pressure, kPa
Closed cell (Static) method
Gas
Direct value, X
1
Data file compiler
Propagation of evaluated standard uncertainties
95
Gas
Liquid mixture 1
Liquid mixture 2
1
Temperature, K
Gas
1
343.15
5
1
2100
2
1
43
10
1
1
2
1
Principal objective of the work
VVD
TRC
6/5/2017
1
Triple point temperature, K
VISOBS
Gas
Direct value, X
1
Data file compiler
Propagation of evaluated standard uncertainties
95
Gas
Liquid mixture 1
Liquid mixture 2
1
Mole fraction
1
Liquid mixture 1
1
0.871
4
1
343.15
5
1
0.2
11
1
1
2
1
Principal objective of the work
VVD
TRC
6/5/2017
1
Mole fraction
?
1
Liquid mixture 1
Direct value, X
1
Data file compiler
Propagation of evaluated standard uncertainties
95
Liquid mixture 1
Liquid mixture 2
1
Pressure, kPa
Liquid mixture 1
2
Temperature, K
Liquid mixture 1
1
3778
4
2
343.15
5
1
0.944
4
1
0.056
12
1
1
2
1
Principal objective of the work
VVD
TRC
6/5/2017
1
Upper consolute pressure, kPa
Closed cell (Static) method
Liquid mixture 1
Direct value, X
1
Data file compiler
Propagation of evaluated standard uncertainties
95
Liquid mixture 1
Liquid mixture 2
1
Temperature, K
Liquid mixture 1
1
343.15
5
1
3778
5
1
40.4
13
1
1
2
1
Principal objective of the work
VVD
TRC
6/5/2017
1
Tracer diffusion coefficient, m2/s
NMR
2
Liquid
Direct value, X
1
Data file compiler
Propagation of evaluated standard uncertainties
95
Liquid
1
Pressure, kPa
Liquid
670
2
2
Temperature, K
Liquid
298.15
5
1
Mole fraction
1
Liquid
1
0.3
2
1
0.0449
3
1
0.0045
1
0.5
2
1
0.0587
3
1
0.0061
1
0.7
2
1
0.104
3
1
0.011
1
0.86
2
1
0.129
3
1
0.046
1
0.98
2
1
1.414
4
1
0.177