TY - JOUR
T1 - High pressure phase equilibrium for delta-tocopherol + CO2
AU - Pereira, P. J.
AU - Coto García, Baudilio
AU - Menduiña, Carlos
AU - de Azevedo, Edmundo Gomes
AU - Ponte, Manuel Luís Magalhães Nunes da
PY - 2004/2/15
Y1 - 2004/2/15
N2 - Vapour-liquid equilibrium compositions were measured for mixtures of delta-tocopherol and carbon dioxide, at pressures from 9 up to 27 MPa, and four temperatures between 306 and 333 K. The system exhibits liquid-liquid equilibrium at high pressures, similarly to previous results for mixtures of alpha-tocopherol with carbon dioxide. The results were correlated with the Peng-Robinson equation of state, using the Panagiotopoulos-Reid combination rules. Comparison of the solubilities of delta-tocopherol and alpha-tocopherol in supercritical carbon dioxide was performed using Chrastil's equation to correlate the data. The number of solvent CO2 molecules per solute molecule was calculated in both cases. An enthalpy of solvation per mole of CO2 of -10 kJ mol(-1) was obtained. (C) 2003 Elsevier B.V. All rights reserved.
AB - Vapour-liquid equilibrium compositions were measured for mixtures of delta-tocopherol and carbon dioxide, at pressures from 9 up to 27 MPa, and four temperatures between 306 and 333 K. The system exhibits liquid-liquid equilibrium at high pressures, similarly to previous results for mixtures of alpha-tocopherol with carbon dioxide. The results were correlated with the Peng-Robinson equation of state, using the Panagiotopoulos-Reid combination rules. Comparison of the solubilities of delta-tocopherol and alpha-tocopherol in supercritical carbon dioxide was performed using Chrastil's equation to correlate the data. The number of solvent CO2 molecules per solute molecule was calculated in both cases. An enthalpy of solvation per mole of CO2 of -10 kJ mol(-1) was obtained. (C) 2003 Elsevier B.V. All rights reserved.
KW - Vapour-liquid equilibria
KW - δ-Tocopherol
KW - Mixture
KW - Supercritical carbon dioxide
UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-0742272134&origin=resultslist&sort=plf-f&src=s&st1
U2 - 10.1016/j.fluid.2003.09.005
DO - 10.1016/j.fluid.2003.09.005
M3 - Article
VL - 216
SP - 53
EP - 57
JO - Fluid Phase Equilibria
JF - Fluid Phase Equilibria
SN - 0378-3812
IS - 1
ER -