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 CO 2 -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, CO 2 + 1-octene, CO + 1-octene + CO 2, CO + nonanal, CO 2 + nonanal, CO + nonanal + CO 2, H 2 + 1-octene, H 2 + 1-octene + CO 2, H 2 + nonanal, and H 2 + nonanal + CO 2 . The measured solubilities of CO and H 2 in the liquid phases were consistent with literature values. The presence of CO 2 was found to enhance the solubilities of both CO and H 2 in the liquid phase. The enhancement factor is up to 1.54 for carbon monoxide and 1.82 for hydrogen. 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.