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Journal of Chemical & Engineering Data Article Table 1. Experimental Density ρ and Calculated Excess Molar Volumes VE for the Mixture of ChCl/Urea (1) + Water (2) at Pressure P = 0.1 MPaa x2 0 0.1525 0.2566 0.3647 0.4670 0.5742 0.6880 0.8269 1 298.15 K 1.1979 1.1907 1.1841 1.1759 1.1659 1.1527 1.1330 1.0951 0.9971 303.15 K 1.1952 1.1880 1.1815 1.1733 1.1632 1.1500 1.1304 1.0927 0.9957 308.15 K 1.1927 1.1854 1.1788 1.1707 1.1606 1.1475 1.1277 1.0901 0.9941 313.15 K 1.1901 1.1827 1.1761 1.1680 1.1579 1.1448 1.1251 1.0875 0.9922 ρ/g·cm−3 318.15 K 1.1875 1.1801 1.1735 1.1653 1.1552 1.1421 1.1224 1.0849 0.9898 323.15 K 1.1849 1.1774 1.1708 1.1626 1.1525 1.1394 1.1196 1.0822 0.9881 328.15 K 1.1823 1.1748 1.1681 1.1600 1.1498 1.1367 1.1169 1.0794 0.9857 333.15 K 1.1797 1.1721 1.1655 1.1570 1.1471 1.1337 1.1141 1.0766 0.9832 VE/cm3·mol−1 000000000 0.1525 −0.0800 −0.0731 0.2566 −0.1079 −0.1042 0.3647 −0.1443 −0.1377 0.4670 −0.1648 −0.1563 0.5742 −0.1934 −0.1828 0.6880 −0.1994 −0.1872 0.8269 −0.1639 −0.1510 100000000 −0.0652 −0.0618 −0.0929 −0.0864 −0.1292 −0.1218 −0.1427 −0.1343 −0.1721 −0.1623 −0.1726 −0.1619 −0.1379 −0.1274 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, and the combined expanded uncertainties Uc are Uc(ρ) = 0.0001 g·cm−3 (level of confidence = 0.95). Figure 1. Densities of {ChCl/urea (1) + water (2)}. (a) At different mole fraction of water. Symbols: □, 0, this work; ▶, 0, Ciocirlan et al.;17 ■, 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 × , 303.15 K, Su et al.;19 ○, 303.15 K, Leron et al;20 ★, 333.15 K, this work; ☆, 333.15 K, Yadav et al.18 +, 333.15 K, Su et al.19 Curves: correlations. −0.0591 −0.0544 −0.0514 −0.0828 −0.0759 −0.0718 −0.1181 −0.1096 −0.1051 −0.1304 −0.1208 −0.1159 −0.1583 −0.1468 −0.1413 −0.1582 −0.1451 −0.1387 −0.1249 −0.1106 −0.1038 −0.0493 −0.0684 −0.0896 −0.1118 −0.1285 −0.1332 −0.0968 Ltd., China. Urea (mass fraction ≥99%) was produced by Xilong Chemical Reagent Co, Ltd., China. CO2 (mole fraction ≥99.9%) was received from Beijing Bei Temperature Gas Factory. The chemicals were analytical reagent (A. R.) grade and used as received. The mixture of choline chloride and urea (ChCl/urea) used in this work was all based on the molar ratio of 1:2 (choline chloride:urea) The mixture was prepared by heating ChCl and urea with a molar ratio of 1:2 at 353.15 K until a homogeneous liquid was formed. Samples were dried under vacuum at 333.15 K for 72 h. The water content of the dried ChCl/urea (1:2) was determined by Karl Fischer titration analysis, which was 1200 ± 100 ppm. 2.2. Density and Viscosity Measurements. The densities of solutions were measured by a high-precision vibrating tube densimeter (Anton Paar DMA 5000, Anton Paar Co., Austria) with the combined expanded uncertainties Uc (ρ) = 0.0001 g· cm−3 (level of confidence = 0.95). The accuracy of temperature measurements is ±0.01 K. The viscosities of solutions were measured by the Anton Paar AMVn Automated Mircovisc- ometer according to Hoeppler’s falling ball principle. The combinations of capillary/ball with different diameters (1.6 mm, 1.8 mm, 3.0 mm, 4.0 mm, etc.) can be selected to measure viscosities from 0.3 mPa·s to 2500 mPa·s. Calibration was carried out using ultrapure water. The temperature accuracy is ±0.01 K and the relative expanded uncertainties for the viscosities are Ur (η) = 0.005 (level of confidence = 0.95). 2.3. CO2 Solubility Measurements. The setup used to measure the gas solubilities in a solvent was illustrated in previous work.16 The apparatus consisted of a gas reservoir, an equilibrium cell, a magnetic stirrer, and two pressure trans- ducers. The gas reservoir and equilibrium cell were placed in a water bath. During the experiment, an accurate amount of solvent was loaded into the equilibrium cell. The volume of the solvent was determined by the mass and density at the 3345 dx.doi.org/10.1021/je500320c | J. Chem. Eng. Data 2014, 59, 3344−3352PDF Image | CO2 Separation with Ionic Liquids
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