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Journal of Chemical & Engineering Data Article Table 2. Redlich−Kister Coefficients of the Excess Molar Volume VE and Excess Molar Active Energy AE for the Mixture of ChCl/Urea (1) + Water (2) A0 A1 A2 A3 A4 −2.636 1.186 −2.589 1.394 −0.3618 6.475 × 10−3 −2.513 × 10−3 7.659 × 10−3 −4.791 × 10−3 8.714 × 10−4 −2.149 × 105 1.321 × 105 7.299 × 104 −6.984 × 105 3.929 × 105 1.167 × 103 −8.095 × 102 −5.769 × 102 4.431 × 103 −2.212 −1.561 1.278 1.110 −7.045 3.054 VE AE cm3·mol−1 J·mol−1 a0 a1 a0 a1 a2 Table 3. Experimental Viscosity η and Calculated Excess Molar Activation Energy AE for the Mixture of ChCl/Urea (1) + Water (2) at Pressure P = 0.1 MPaa x2 298.15 K 303.15 K 308.15 K 313.15 K 318.15 K 323.15 K 328.15 K 333.15 K η/mPa·s 0 0.1525 0.2566 0.3647 0.4670 0.5742 0.6880 0.8269 1 1571 323.9 113.8 45.06 21.10 10.22 5.076 2.261 0.894 953.7 222.5 83.87 35.51 17.37 8.743 4.448 2.027 0.801 608.4 152.8 64.34 28.57 14.54 7.578 3.951 1.843 0.723 403.2 112.7 50.38 23.37 12.36 6.620 3.521 1.621 0.656 277.2 83.68 40.31 19.38 10.60 5.845 3.226 1.513 0.599 195.9 66.36 32.84 16.32 9.191 5.221 2.897 1.388 0.549 143.6 52.13 27.03 13.94 8.030 4.699 2.645 1.277 0.506 107.7 42.52 22.72 12.03 7.078 4.165 2.389 1.182 0.469 AE/J·mol−1 000000000 −988.4 −671.6 −298.2 and the relative expanded uncertainties for the viscosities Ur(η) = 0.005 (level of confidence = 0.95). −45.12 157.4 239.1 −907.7 −462.7 −11.77 108.8 −676.5 −533.4 −167.9 −214.3 −234.9 Figure 3. Viscosities of {ChCl/urea (1) + water (2)}. (a) At different mole fractions of water. Symbols: ■, 0, this work; ▶, 0, Ciocirlan et al.;17 × , 0, Abbott et al.;9 +, 0, Yadav et al.;18 □, 0.1525; ●, 0.2566; ○, 0.3647; ▲, 0.4670; △, 0.5742; ▼, 0.6880; ▽, 0.8269. (b) At two temperatures. Symbols: ◆, 303.15 K, this work; ◇, 303.15 K, Yadav et al;18 ★, 333.15 K, this work; ☆, 333.15 K, Yadav et al.18 Curves: correlations. −867.3 −1403 −1588 −1499 −1269 −717.2 −1188 −1313 −1213 −459.6 −564.9 −629.2 −483.9 −274.6 −256.4 −363.7 −416.1 −262.5 −48.52 −70.24 −78.80 79.91 273.9 438.2 446.5 0.1525 0.2566 0.3647 0.4670 0.5742 0.6880 0.8269 100000000 −963.8 −755.0 −1065 −832.6 −951.4 −701.5 −729.7 −491.1 −445.7 −245.9 −80.23 154.7 327.5 345.1 −129.4 −72.29 ax2 is the mole fraction of water in the mixture of (ChCl/urea + water). Standard uncertainties u are u(T) = 0.01 K, u(P) = 10 kPa, u(x2) = 0.0001, Abbott et al.9 measured the viscosities of ChCl/urea at 293.15 K, 303.15 K, 313.15 K, and 323.15 K. Ciocirlan et al.17 measured the viscosities of ChCl/urea at temperatures from 308 K to 348 K. Yadav et al.18 measured the viscosities of ChCl/urea at temperatures from 293.15 K to 363.15 K. The viscosities measured in this work were compared with those in the literatures.9,17,18 It was found that discrepancies exist as shown in Figure 3a. At 313.2 K, the viscosity of ChCl/urea is 403.2 mPa·s from this work, whereas the viscosities are 209.3 mPa·s from the work of Abbott et al.,9 338.7 ± 0.4 mPa·s from the work of Ciocirlan et al.17 and 238.1 mPa·s from the work of Yadav et al.,18 respectively. The relative deviations in viscosity 3347 dx.doi.org/10.1021/je500320c | J. Chem. Eng. Data 2014, 59, 3344−3352PDF Image | CO2 Separation with Ionic Liquids
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