Phase behavior of β-d galactose pentaacetate–carbon dioxide binary system |
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| Institution: | 1. Centre of Molecular and Macromolecular Studies, Polish Academy of Sciences, Sienkiewicza 112, 90 363 Lodz, Poland;2. Institute of Biopolymers and Chemical Fibres, Marii Sklodowskiej-Curie 19/27, 90 570 Lodz, Poland;1. Department of Chemistry, University of Oslo, Centre for Materials Science and Nanotechnology, FERMiO, Gaustadalleen 21, NO-0349 Oslo, Norway;2. Department of Physics, University of Oslo, Centre for Materials Science and Nanotechnology, P.O. Box 1048 Blindern, NO-0316 Oslo, Norway;3. SINTEF Materials and Chemistry, P.O. Box 124 Blindern, NO-0314 Oslo, Norway;4. Department of Materials Science and Engineering, Norwegian University of Science and Technology, NO-7491 Trondheim, Norway;1. IEM (Institut Europeen des Membranes), UMR 5635 (CNRS-ENSCM-UM), Universite de Montpellier, Place E. Bataillon, F- 34095, Montpellier, France;2. Van Lang University, 45 Nguyen Khac Nhu, District 1, Ho Chi Minh City, Viet Nam;3. ICGM (Institut Charles Gerhardt de Montpellier), UMR 5253, Universite de Montpellier, Place E. Bataillon, F- 34095, Montpellier, France |
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| Abstract: | Phase behavior of β-d galactose pentaacetate–carbon dioxide binary system is investigated by dew-point and bubble-point measurements conducted in a high pressure variable volume sapphire cell. The phase envelope for solutions of β-d galactose pentaacetate in supercritical CO2 is obtained for β-d galactose pentaacetate concentrations between 2 and 26 wt%, and for the temperature range of 308–323 K. The system exhibits lower critical solution temperature (LCST) behavior and high solubility of β-d galactose pentaacetate is observed. The densities of the system are also measured, and liquid-like densities (near 1 g/cm3) are observed for single-phase solutions of β-d galactose pentaacetate in supercritical CO2 at concentrations of 18 wt% and higher. Viscosity is measured for solutions of 18 and 25 wt% β-d galactose pentaacetate in the single-phase region at 313 K and 17 MPa and the viscosity values, 0.095 and 0.103 cp, respectively, are similar in magnitude to the viscosity of pure carbon dioxide. |
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