High pressure phase equilibrium for delta-tocopherol + CO2

P. J. Pereira; Baudilio Coto García; Carlos Menduiña; Edmundo Gomes de Azevedo; Manuel Luís Magalhães Nunes da Ponte

doi:10.1016/j.fluid.2003.09.005

High pressure phase equilibrium for delta-tocopherol + CO2

P. J. Pereira, Baudilio Coto García, Carlos Menduiña, Edmundo Gomes de Azevedo, Manuel Luís Magalhães Nunes da Ponte

Research output: Contribution to journal › Article

17 Citations (Scopus)

Abstract

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.

Original language	English
Pages (from-to)	53-57
Number of pages	5
Journal	Fluid Phase Equilibria
Volume	216
Issue number	1
DOIs	https://doi.org/10.1016/j.fluid.2003.09.005
Publication status	Published - 15 Feb 2004

Keywords

Vapour-liquid equilibria
δ-Tocopherol
Mixture
Supercritical carbon dioxide

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10.1016/j.fluid.2003.09.005

https://www.scopus.com/record/display.uri?eid=2-s2.0-0742272134&origin=resultslist&sort=plf-f&src=s&st1

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title = "High pressure phase equilibrium for delta-tocopherol + CO2",

abstract = "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.",

keywords = "Vapour-liquid equilibria, δ-Tocopherol, Mixture, Supercritical carbon dioxide",

author = "Pereira, {P. J.} and {Coto Garc{\'i}a}, Baudilio and Carlos Mendui{\~n}a and {de Azevedo}, {Edmundo Gomes} and Ponte, {Manuel Lu{\'i}s Magalh{\~a}es Nunes da}",

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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

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