(179c) Heat and Momentum Transport Properties of CO2-Expanded Liquids (CXLs): N-Hexane, n-Decane, and n-Tetradecane

Many important processes exploit liquids saturated with significant quantities of gases at elevated pressures for separations, reactions, and materials processing; e.g. CO₂ capture and sequestration; enhanced oil recovery ; Gas- or CO₂ -expanded Liquids; particle formation from Gas or Supercritical Anti-Solvent methods; etc. To engineer these systems, the thermodynamic and transport properties are required. This contribution is one of the first reports for the full heat transport properties (thermal conductivity, thermal diffusivity, heat capacity, and dynamic and kinematic viscosity) of gas-saturated liquids at elevated pressures for the binary systems of CO₂ and the n-alkanes, n-hexane, n-decane, or n-tetradecane, at 25°, 40°, and 55°C and pressures up to 106 bars. Equation of state modeling of literature vapor-liquid equilibrium data was used to determine the compositions at the conditions of the experimental heat transport measurements. All measured properties decrease with increasing pressure (i.e. increasing composition of CO₂) and tend to be relatively linear until a CO₂ composition of approximately 70%mole. The Prandtl number, Pr, is calculated and the effect of CO₂ composition on heat transfer engineering is discussed.