A new apparatus for the determination of P-x-y diagrams and Henry's constants in high pressure alcohols with critical carbon dioxide

P-x-y diagrams and Henry's constants for carbon dioxide+methanol, ethanol, acetone, octanol, nonanol and decanol were determined by a novel technique of density measurement at different temperatures and pressures up to 8 MPa. Solubilities of carbon dioxide in these six binary mixtures were found to increase with applied pressure, but to decrease with increasing temperature. Also, Henry's constants for CO2 in these six systems decreased with ascending pressure but increased with elevated temperature. The Peng-Robinson equation of state and the Patel-Teja equation of state, with two adjustable parameters, were able to correlate equilibrium data successfully. (C) 1998 Elsevier Science B.V. All rights reserved.