2
0
2011
yu
han
0
journal
Original
Yu, C.[Cuilan]
Han, J.[Juan]
Wang, Y.[Yun]
Yan, Y.[Yongsheng]
Hu, S.[Shiping]
Li, Y.[Yanfang]
Zhao, X.[Xiaohong]
Thermochim. Acta
2011
2020-09-29
Liquid-liquid equilibrium composed of imidazolium tetrafluoroborate ionic liquids + sodium carbonate aqueous two-phase systems and correlation at (288.15, 298.15, and 308.15) K
Binodal curves of 1-ethyl-3-methylimidazolium tetrafluoroborate ([Emim]BF4) + sodium carbonate and 1-propyl-3-methylimidazolium tetrafluoroborate ([Pmim]BF4) + sodium carbonate systems have been determined experimentally at T = (288.15, 298.15, and 308.15) K, respectively. An empirical nonlinear expression which has four fitting parameters was used to reproduce experimental binodal data. The tie-line data were successfully correlated by the Othmer-Tobias and Bancroft and two-parameter equations. Good agreement was obtained with the experimental tie-line data with both models. Factors affecting the binodal curves such as temperature and nature of ionic liquids were also studied. It was demonstrated that two-phase area was expanded with a decrease in temperature, while the absolute value of slope of the ties slightly decreases with an increase in temperature. However, the binodal curves became more close to the origin with an increase in alkyl chain length of the ionic liquids (ILs) on the investigated systems.
Liquid liquid equilibrium
aqueous two-phase system
imidazolium tetrafluoroborate ionic liquids
sodium carbonate
10.1016/j.tca.2011.05.028
1-2
523
221-6
1
InChI=1S/CH2O3.2Na/c2-1(3)4;;/h(H2,2,3,4);;/q;2*+1/p-2
CDBYLPFSWZWCQE-UHFFFAOYSA-L
sodium carbonate
CNa2O3
1
Commercial source
1
99
2
Stated by supplier
2
InChI=1S/H2O/h1H2
XLYOFNOQVPJJNP-UHFFFAOYSA-N
water
H2O
1
Commercial source
1
Fractional distillation
2
99.9
3
Estimated by the compiler
3
InChI=1S/C6H11N2.BF4/c1-3-8-5-4-7(2)6-8;2-1(3,4)5/h4-6H,3H2,1-2H3;/q+1;-1
CUNYTRQQXKCRTJ-UHFFFAOYSA-N
1-ethyl-3-methylimidazolium tetrafluoroborate
1-ethyl-3-methyl-1H-imidazol-3-ium tetrafluoroborate
1-ethyl-3-methylimidazolium tetrafluoroborate [EMIM][BF4]
C6H11BF4N2
1
Commercial source
1
99
2
Stated by supplier
4
InChI=1S/C7H13N2.BF4/c1-3-4-9-6-5-8(2)7-9;2-1(3,4)5/h5-7H,3-4H2,1-2H3;/q+1;-1
XFTQQJUVYZPNRC-UHFFFAOYSA-N
1-propyl-3-methylimidazolium tetrafluoroborate
C7H13BF4N2
1
Commercial source
1
99
2
Stated by supplier
1
1
1
2
1
3
1
Principal objective of the work
VVD
TRC
8/11/2011
1
Mole fraction
Spectrometry
1
Liquid mixture 2
Direct value, X
1
Data file compiler
Propagation of evaluated standard uncertainties
95
2
Mole fraction
Spectrometry
1
Liquid mixture 1
Direct value, X
1
Data file compiler
Propagation of evaluated standard uncertainties
95
3
Mole fraction
Spectrometry
3
Liquid mixture 1
Direct value, X
1
Data file compiler
Propagation of evaluated standard uncertainties
95
Liquid mixture 2
Liquid mixture 1
1
Pressure, kPa
Liquid mixture 2
101
3
1
Temperature, K
Liquid mixture 1
2
Mole fraction
3
Liquid mixture 2
1
288.15
5
2
0.0743
3
1
0.1622
4
1
0.0015
2
0.0048
2
1
0.001
3
0.6445
4
1
288.15
5
2
0.0577
3
1
0.1809
4
1
0.0016
2
0.0021
2
1
0.001
3
0.6894
4
1
288.15
5
2
0.0646
3
1
0.1726
4
1
0.0015
2
0.0037
2
1
0.001
3
0.6611
4
1
298.15
5
2
0.0976
3
1
0.1485
4
1
0.0013
2
0.0157
3
1
0.001
3
0.5572
4
1
298.15
5
2
0.0849
3
1
0.1591
4
1
0.0014
2
0.0101
3
1
0.001
3
0.6072
4
1
298.15
5
2
0.0715
3
1
0.1722
4
1
0.0014
2
0.0071
2
1
0.001
3
0.638
4
1
308.15
5
2
0.0918
3
1
0.1613
4
1
0.0013
2
0.0133
3
1
0.001
3
0.5979
4
1
308.15
5
2
0.0787
3
1
0.1731
4
1
0.0016
2
0.0117
3
1
0.001
3
0.6122
4
1
308.15
5
2
0.0763
3
1
0.1762
4
1
0.0016
2
0.0105
3
1
0.001
3
0.6234
4
2
1
1
2
1
3
1
Principal objective of the work
VVD
TRC
8/11/2011
1
Mole fraction
Titration method
3
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
101
3
1
Temperature, K
Liquid mixture 1
2
Mole fraction
1
Liquid mixture 1
1
288.15
5
2
0.0058
2
1
0.6415
4
1
0.0179
1
288.15
5
2
0.0064
2
1
0.6174
4
1
0.0157
1
288.15
5
2
0.0105
3
1
0.5754
4
1
0.0164
1
288.15
5
2
0.0119
3
1
0.5557
4
1
0.0169
1
288.15
5
2
0.0158
3
1
0.526
4
1
0.0166
1
288.15
5
2
0.0189
3
1
0.5021
4
1
0.0173
1
288.15
5
2
0.0214
3
1
0.4824
4
1
0.017
1
288.15
5
2
0.0238
3
1
0.4628
4
1
0.0156
1
288.15
5
2
0.0286
3
1
0.4365
4
1
0.0147
1
288.15
5
2
0.0323
3
1
0.4128
4
1
0.014
1
288.15
5
2
0.0364
3
1
0.3913
4
1
0.0132
1
288.15
5
2
0.0412
3
1
0.3654
4
1
0.0123
1
288.15
5
2
0.0468
3
1
0.3408
4
1
0.0114
1
288.15
5
2
0.0523
3
1
0.3165
4
1
0.0107
1
288.15
5
2
0.0565
3
1
0.3005
4
1
0.0102
1
288.15
5
2
0.061
3
1
0.2811
4
1
0.0095
1
288.15
5
2
0.0669
3
1
0.2613
4
1
0.0088
1
288.15
5
2
0.0723
3
1
0.2418
4
1
0.0083
1
288.15
5
2
0.0772
3
1
0.2256
4
1
0.0077
1
288.15
5
2
0.0843
3
1
0.2035
4
1
0.007
1
288.15
5
2
0.0896
3
1
0.1891
4
1
0.0064
1
288.15
5
2
0.0958
3
1
0.1736
4
1
0.0059
1
288.15
5
2
0.0996
3
1
0.1652
4
1
0.0055
1
288.15
5
2
0.1048
4
1
0.1562
4
1
0.0053
1
288.15
5
2
0.1098
4
1
0.1444
4
1
0.0049
1
288.15
5
2
0.118
3
1
0.1302
4
1
0.0043
1
288.15
5
2
0.1246
4
1
0.1231
4
1
0.0041
1
288.15
5
2
0.1293
4
1
0.1144
4
1
0.0038
1
288.15
5
2
0.1348
4
1
0.1079
4
1
0.0036
1
288.15
5
2
0.1402
4
1
0.1012
4
1
0.0034
1
288.15
5
2
0.1484
4
1
0.0917
3
1
0.0031
1
288.15
5
2
0.1557
4
1
0.0821
3
1
0.0028
1
288.15
5
2
0.1641
4
1
0.0743
3
1
0.0025
1
288.15
5
2
0.1764
4
1
0.0647
3
1
0.0022
1
298.15
5
2
0.0052
2
1
0.6656
4
1
0.0154
1
298.15
5
2
0.008
2
1
0.6218
4
1
0.0167
1
298.15
5
2
0.0103
3
1
0.6068
4
1
0.0152
1
298.15
5
2
0.0142
3
1
0.5668
4
1
0.0159
1
298.15
5
2
0.0193
3
1
0.5305
4
1
0.0163
1
298.15
5
2
0.0231
3
1
0.5025
4
1
0.0173
1
298.15
5
2
0.0246
3
1
0.4877
4
1
0.017
1
298.15
5
2
0.0279
3
1
0.4636
4
1
0.0158
1
298.15
5
2
0.0303
3
1
0.451
4
1
0.015
1
298.15
5
2
0.0349
3
1
0.4249
4
1
0.0143
1
298.15
5
2
0.0378
3
1
0.409
4
1
0.0135
1
298.15
5
2
0.0437
3
1
0.3825
4
1
0.0127
1
298.15
5
2
0.0463
3
1
0.3699
4
1
0.0123
1
298.15
5
2
0.0529
3
1
0.3385
4
1
0.0114
1
298.15
5
2
0.0578
3
1
0.3192
4
1
0.0106
1
298.15
5
2
0.0626
3
1
0.2989
4
1
0.01
1
298.15
5
2
0.069
3
1
0.274
4
1
0.0093
1
298.15
5
2
0.0728
3
1
0.2594
4
1
0.0088
1
298.15
5
2
0.0801
3
1
0.2346
4
1
0.0079
1
298.15
5
2
0.0875
3
1
0.2128
4
1
0.0072
1
298.15
5
2
0.0939
3
1
0.195
4
1
0.0066
1
298.15
5
2
0.0999
3
1
0.179
4
1
0.006
1
298.15
5
2
0.1098
4
1
0.1572
4
1
0.0053
1
298.15
5
2
0.1159
4
1
0.1446
4
1
0.0048
1
298.15
5
2
0.1247
4
1
0.1306
4
1
0.0043
1
298.15
5
2
0.1276
4
1
0.1262
4
1
0.0041
1
298.15
5
2
0.1422
4
1
0.1068
4
1
0.0036
1
298.15
5
2
0.1497
4
1
0.0961
3
1
0.0033
1
298.15
5
2
0.1526
4
1
0.092
3
1
0.003
1
298.15
5
2
0.1621
4
1
0.0838
3
1
0.0028
1
298.15
5
2
0.1671
4
1
0.0785
3
1
0.0026
1
298.15
5
2
0.177
3
1
0.071
3
1
0.0024
1
298.15
5
2
0.182
3
1
0.0657
3
1
0.0024
1
308.15
5
2
0.0114
3
1
0.6169
4
1
0.0154
1
308.15
5
2
0.0147
3
1
0.5845
4
1
0.0157
1
308.15
5
2
0.0171
3
1
0.5662
4
1
0.0154
1
308.15
5
2
0.0202
3
1
0.5435
4
1
0.0163
1
308.15
5
2
0.024
3
1
0.5109
4
1
0.0166
1
308.15
5
2
0.0278
3
1
0.4917
4
1
0.0164
1
308.15
5
2
0.0296
3
1
0.4747
4
1
0.0159
1
308.15
5
2
0.0336
3
1
0.4541
4
1
0.0153
1
308.15
5
2
0.0375
3
1
0.4272
4
1
0.0146
1
308.15
5
2
0.0411
3
1
0.4088
4
1
0.0137
1
308.15
5
2
0.0448
3
1
0.3886
4
1
0.0128
1
308.15
5
2
0.0517
3
1
0.3608
4
1
0.012
1
308.15
5
2
0.0558
3
1
0.3416
4
1
0.0114
1
308.15
5
2
0.0605
3
1
0.3228
4
1
0.0107
1
308.15
5
2
0.0652
3
1
0.3055
4
1
0.0102
1
308.15
5
2
0.0733
3
1
0.2748
4
1
0.0092
1
308.15
5
2
0.0806
3
1
0.2524
4
1
0.0085
1
308.15
5
2
0.0824
3
1
0.2459
4
1
0.0083
1
308.15
5
2
0.0885
3
1
0.2246
4
1
0.0077
1
308.15
5
2
0.0907
3
1
0.2195
4
1
0.0073
1
308.15
5
2
0.0983
3
1
0.1982
4
1
0.0068
1
308.15
5
2
0.1035
4
1
0.1833
4
1
0.0061
1
308.15
5
2
0.1074
4
1
0.1775
4
1
0.0059
1
308.15
5
2
0.1149
4
1
0.1603
4
1
0.0053
1
308.15
5
2
0.1259
4
1
0.1407
4
1
0.0047
1
308.15
5
2
0.1332
4
1
0.1284
4
1
0.0042
1
308.15
5
2
0.1437
4
1
0.1141
4
1
0.0038
1
308.15
5
2
0.1485
4
1
0.1064
4
1
0.0035
1
308.15
5
2
0.1587
4
1
0.0952
3
1
0.0031
1
308.15
5
2
0.1634
4
1
0.09
3
1
0.003
1
308.15
5
2
0.1696
4
1
0.0833
3
1
0.0027
1
308.15
5
2
0.1787
4
1
0.0757
3
1
0.0025
1
308.15
5
2
0.1918
4
1
0.0657
3
1
0.0022
3
1
1
2
1
4
1
Principal objective of the work
VVD
TRC
8/11/2011
1
Mole fraction
Spectrometry
1
Liquid mixture 2
Direct value, X
1
Data file compiler
Propagation of evaluated standard uncertainties
95
2
Mole fraction
Spectrometry
1
Liquid mixture 1
Direct value, X
1
Data file compiler
Propagation of evaluated standard uncertainties
95
3
Mole fraction
Spectrometry
4
Liquid mixture 1
Direct value, X
1
Data file compiler
Propagation of evaluated standard uncertainties
95
Liquid mixture 2
Liquid mixture 1
1
Pressure, kPa
Liquid mixture 2
101
3
1
Temperature, K
Liquid mixture 2
2
Mole fraction
4
Liquid mixture 2
1
288.15
5
2
0.7996
4
1
0.0161
3
1
0.001
2
0.1642
4
1
0.0014
3
0.0508
3
1
288.15
5
2
0.7945
4
1
0.0162
3
1
0.001
2
0.1619
4
1
0.0014
3
0.053
3
1
288.15
5
2
0.7802
4
1
0.0165
3
1
0.001
2
0.1598
4
1
0.0014
3
0.055
3
1
298.15
5
2
0.7398
4
1
0.0174
3
1
0.001
2
0.1514
4
1
0.0014
3
0.0636
3
1
298.15
5
2
0.7573
4
1
0.017
3
1
0.001
2
0.1586
4
1
0.0014
3
0.0562
3
1
298.15
5
2
0.7573
4
1
0.017
3
1
0.001
2
0.1566
4
1
0.0014
3
0.0582
3
1
308.15
5
2
0.6844
4
1
0.0196
3
1
0.001
2
0.155
4
1
0.0016
3
0.0807
3
1
308.15
5
2
0.6594
4
1
0.0206
3
1
0.001
2
0.1497
4
1
0.0015
3
0.0856
3
1
308.15
5
2
0.7305
4
1
0.017
3
1
0.001
2
0.1643
4
1
0.0016
3
0.073
3
4
1
1
2
1
4
1
Principal objective of the work
VVD
TRC
8/11/2011
1
Mole fraction
Titration method
4
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
101
3
1
Temperature, K
Liquid mixture 1
2
Mole fraction
1
Liquid mixture 1
1
288.15
5
2
0.029
3
1
0.4534
4
1
0.0232
1
288.15
5
2
0.0301
3
1
0.4263
4
1
0.0196
1
288.15
5
2
0.0311
3
1
0.4146
4
1
0.0215
1
288.15
5
2
0.0324
3
1
0.3929
4
1
0.0191
1
288.15
5
2
0.0338
3
1
0.3706
4
1
0.0164
1
288.15
5
2
0.0353
3
1
0.3501
4
1
0.0154
1
288.15
5
2
0.0376
3
1
0.3374
4
1
0.0125
1
288.15
5
2
0.0402
3
1
0.3171
4
1
0.012
1
288.15
5
2
0.0435
3
1
0.2969
4
1
0.011
1
288.15
5
2
0.047
3
1
0.2761
4
1
0.0099
1
288.15
5
2
0.0512
3
1
0.2579
4
1
0.0093
1
288.15
5
2
0.054
3
1
0.2432
4
1
0.0086
1
288.15
5
2
0.0582
3
1
0.2293
4
1
0.0079
1
288.15
5
2
0.062
3
1
0.2148
4
1
0.0074
1
288.15
5
2
0.0677
3
1
0.1989
4
1
0.0068
1
288.15
5
2
0.0724
3
1
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