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Aqueous Biphasic Systems with Ionic Liquids
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Table 3. Fitting parameters for the mole fraction solubility of water in ILs, as a function of
temperature, using Eq. 1.
x water
20
0.45
0.40
0.35
0.30
0.25
IL A1 B1 / K Adj R 2(a) δ / (%)
[C3mim][PF6] 3.94 -1541 0.9988 1.01
[C4mim][PF6] 2.92 -1261 0.9967 1.94
[C3mpy][PF6] 3.99 -1579 0.9947 0.66
[C3mpy][Tf2N] 41 2.68 -1227 0.9950 1.49
[C1mim][Tf2N] 2.54 -1040 0.9975 1.23
[C2mim][Tf2N] 35 1.57 -827 0.9939 0.91
[C3mim][Tf2N] 35 1.71 -896 0.9929 1.40
[C4mim][Tf2N] 35 1.72 -936 0.9998 0.25
[C5mim][Tf2N] 35 1.29 -831 0.9930 1.11
[C2C2im][Tf2N] 2.41 -1101 0.9935 1.88
[C4C1mim][Tf2N] 2.99 -1376 0.9939 2.53
(a) Adjusted R 2
0.20
285 290 295 300 305 310 315 320
T / K
0.15
285 290 295 300 305 310 315 320
Figure 11. Experimental solubility values adjusted with Eq. 1: , [C3mim][PF6]; ,
[C3mpy][PF6]; , [C4mim][PF6]; ○, [C1mim][Tf2N]; ×, [C2mim][Tf2N] 35 ; , [C2C2mim][Tf2N]; ,
[C3mim][Tf2N] 35 ; , [C4mim][Tf2N] 35 ; , [C3mpy][Tf2N] 41 ; +, [C5mim][Tf2N] 35 ; –,
[C4C1mim][Tf2N].
x water
0.45
0.40
0.35
0.30
0.25
0.20
T / K