Phase behavior of beta-D galactose pentaacetate-carbon dioxide binary system

DİLEK Ç., Manke C. W., Gulari E.

FLUID PHASE EQUILIBRIA, vol.239, no.2, pp.172-177, 2006 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 239 Issue: 2
  • Publication Date: 2006
  • Doi Number: 10.1016/j.fluid.2005.11.013
  • Journal Name: FLUID PHASE EQUILIBRIA
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.172-177
  • Keywords: beta-D galactose pentaacetate, sugar acetate, supercritical carbon dioxide, solubility, phase equilibria, VAPOR-LIQUID-EQUILIBRIA, SUPERCRITICAL CO2, HIGH SOLUBILITY, POLYMERS, COPOLYMERS, CO2-SOLUBILITY, PRESSURE
  • Middle East Technical University Affiliated: No

Abstract

Phase behavior of beta-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 beta-D galactose pentaacetate in supercritical M is obtained for beta-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 beta-D galactose pentaacetate is observed. The densities of the system are also measured, and liquid-like densities (near 1 g/cm(3)) are observed for single-phase solutions of beta-D galactose pentaacetate in supercritical CO2 at concentrations of 18 wt% and higher. Viscosity is measured for solutions of 18 and 25 wt% beta-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. (c) 2005 Elsevier B.V. All rights reserved.