High pressure phase equilibrium measurements for binary systems CO sub(2) + 1-pentanol and CO sub(2) + 1-hexanol

This work reports phase equilibrium measurements for the systems CO sub(2)(1) + 1-pentanol(2) and CO sub(2)(1) + 1-hexanol(2). Experiments were carried out using a high pressure variable-volume view cell with operating temperatures ranged from 303.15 K to 373.15 K and pressures up to 17.05 MPa for t...

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Bibliographic Details
Published in:The Journal of supercritical fluids 2014-04, Vol.88, p.38-45
Main Authors: Pereira, Larissa, Santos, Priscilla Gaschi dos, Scheer, Agnes P, Ndiaye, Papa M, Corazza, Marcos L
Format: Article
Language:English
Subjects:
Carbon dioxide
Equations of state
Fittings
Mathematical models
Mixing rules
Operating temperature
Phase transformations
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Summary:This work reports phase equilibrium measurements for the systems CO sub(2)(1) + 1-pentanol(2) and CO sub(2)(1) + 1-hexanol(2). Experiments were carried out using a high pressure variable-volume view cell with operating temperatures ranged from 303.15 K to 373.15 K and pressures up to 17.05 MPa for the system CO sub(2) + 1-pentanol, and 303.15 K to 353.15 K with pressures up to 16.2 MPa for the system CO sub(2) + 1-hexanol. The CO sub(2) molar fractions were ranged from 0.3987 to 0.9192 for the system CO sub(2)(1) + 1-pentanol(2) and from 0.3926 to 0.9800 for the system CO sub(2)(1) + 1-hexanol(2), respectively. Only vapor-liquid (VL) phase transitions were observed for the system CO sub(2)(1) + 1-pentanol(2), while for the system with 1-hexanol(2) vapor-liquid (VL), liquid-liquid (LL) and vapor-liquid-liquid (VLL) phase transition were observed. The experimental data sets were modeled using the Peng-Robinson equation of state with a classical van der Waals quadratic mixing rule (PR-vdW2) and with Wong-Sandler (PR-WS) mixing rule, and they were compared with predicted values using the Predictive Soave-Redlich-Kwong (PSRK) equation of state. PR-WS model provided a better fitting to experimental data for both systems modeled.
ISSN:0896-8446
DOI:10.1016/j.supflu.2014.01.005