TY - JOUR
T1 - Vapor-liquid equilibria for CO2-fermentation alcohol mixtures
T2 - Application of a new group contribution equation of state to isomeric compounds
AU - Inomata, Hiroshi
AU - Kondo, Akihiro
AU - Kakehashi, Hideki
PY - 2005/2/1
Y1 - 2005/2/1
N2 - This study provides vapor-liquid equilibrium data that can be used for the separation of trace components from fermentation alcohol with supercritical CO2. C4 and C5 alcohols were selected as key components among the trace components of fermentation alcohols because these are impurities that can be produced during the process and separation is necessary from alcohol aqueous solutions. Vapor-liquid equilibrium data were measured for the systems of CO2-1,3-butanediol, CO2-1,2-butanediol, CO2-iso-amylalcohol, CO2-2-methylbutanol, and CO 2-iso-butanol at 313.2 and 333.2 K at pressures from 4 to 15 MPa. The experimental results demonstrated that the isomers exhibited a slightly different phase behavior for the binary mixtures of CO2 at the range studied. The group contribution equation of state (GC-EOS) proposed by Skjold-Jorgensen [S. Skjold-Jorgensen, Fluid Phase Equilib. 16 (1984) 317-351] was modified to allow application to isomers by considering the contact surface area between molecular pairs. The new model could predict the phase behavior of the binary mixtures of CO2 and C4/C5 alcohols contained in fermentation alcohols.
AB - This study provides vapor-liquid equilibrium data that can be used for the separation of trace components from fermentation alcohol with supercritical CO2. C4 and C5 alcohols were selected as key components among the trace components of fermentation alcohols because these are impurities that can be produced during the process and separation is necessary from alcohol aqueous solutions. Vapor-liquid equilibrium data were measured for the systems of CO2-1,3-butanediol, CO2-1,2-butanediol, CO2-iso-amylalcohol, CO2-2-methylbutanol, and CO 2-iso-butanol at 313.2 and 333.2 K at pressures from 4 to 15 MPa. The experimental results demonstrated that the isomers exhibited a slightly different phase behavior for the binary mixtures of CO2 at the range studied. The group contribution equation of state (GC-EOS) proposed by Skjold-Jorgensen [S. Skjold-Jorgensen, Fluid Phase Equilib. 16 (1984) 317-351] was modified to allow application to isomers by considering the contact surface area between molecular pairs. The new model could predict the phase behavior of the binary mixtures of CO2 and C4/C5 alcohols contained in fermentation alcohols.
KW - CO
KW - EOS
KW - Ethanol
KW - Fermentation
KW - Group contribution
UR - http://www.scopus.com/inward/record.url?scp=17544372896&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=17544372896&partnerID=8YFLogxK
U2 - 10.1016/j.fluid.2004.09.033
DO - 10.1016/j.fluid.2004.09.033
M3 - Article
AN - SCOPUS:17544372896
SN - 0378-3812
VL - 228-229
SP - 335
EP - 343
JO - Fluid Phase Equilibria
JF - Fluid Phase Equilibria
ER -