(386a) Solubilities of CO and H2 in Neat and CO2-Expanded Hydroformylation Reaction Mixtures Containing 1-Octene and Nonanal up to 353.15 K and 9 Mpa

Accurate knowledge of the phase equilibria of CO₂-expanded hydroformylation reaction mixtures is essential to rational process design and development. Vapor liquid equilibria of the following systems were measured in a variable volume view cell at temperatures ranging from 313.15 to 353.15 K and pressures up to 9 MPa: CO + 1-octene, CO₂ + 1-octene, CO + 1-octene + CO₂, CO + nonanal, CO₂ + nonanal, CO + nonanal + CO₂, H₂ + 1-octene, H₂ + 1-octene + CO₂, H₂ + nonanal and H₂ + nonanal + CO₂. The measured solubilities of CO and H₂ in the liquid phases were consistent with literature values. The presence of CO₂ was found to enhance the solubilities of both CO and H₂ in the liquid phase. The enhancement factor is up to 1.54 for carbon monoxide and 1.82 for hydrogen. The enhancement of CO and H₂ solubilities is slightly higher in nonanal than in 1-octene. The Peng-Robinson equation of state (PR EoS) with van der Waals mixing rules and binary interaction parameters modeled the VLE data adequately, with much better fits for the 1-octene systems compared to the more polar nonanal systems.