Sammendrag
Accurate experimental data on the thermo-physical properties of CO2-mixtures are prerequisites for development of more accurate models and hence more precise design of CO2 capture and storage (CCS) processes. A literature survey was conducted on both the available experimental data and the theoretical models associated with the transport properties of CO2-mixtures within the operation windows of CCS. Gaps were identified between the available knowledge and requirements of the system design and operation. For the experimental gas-phase measurements, there are no available data about any transport properties of CO2/H2S, CO2/COS and CO2/NH3; and except for CO2/H2O, CO2/H2O/NaCl and CO2/amine/H2O mixtures, there are no available measurements regarding the transport properties of any liquid-phase mixtures. In the prediction of gas-phase viscosities using Chapman-Enskog theory, deviations are typically less than 2% at atmospheric pressure and moderate temperatures. The deviations increase with increasing temperatures and pressures. Using both the Rigorous Kinetic Theory (RKT) and empirical models in the prediction of gas-phase thermal conductivities, typical deviations are 2.2-9%. Comparison of popular empirical models for estimation of gas-phase diffusion coefficients with newer experimental data for CO2/H2O shows deviations of up to 20%. For many mixtures relevant for CCS, the diffusion coefficient models based on the RKT show predictions within the experimental uncertainty. Typical reported deviations of the CO2/H2O system using empirical models are below 3% for the viscosity and the thermal conductivity and between 5-20% for the diffusion coefficients. The research community knows little about the effect of other impurities in liquid CO2 than water, and this is an important area to focus at in future work.
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