CO2-mixture properties for pipeline transportation in the CCS process

Transport is an essential feature of the CCS process as the CO2 quality required for transport may influence the choice of the capture technology and impose limits on the performance requirements. Therefore, to design CO2 transport networks, it is important to have an accurate knowledge of the thermodynamic properties of CO2-mixtures. In this paper the results of different EOS (both cubic equations as Peng-Robinson or Redlich-Kwong-Soave and non-analytical equations as Benedict-Webb-Rubin- Starling, Lee-Kesler or GERG model) have been compared with P-ρ-T experimental data obtained by the authors. The Lee-Kesler equation and the GERG model showed a good prediction of CO2-mixture density in the working conditions of the pipeline transport. Finally, simulations of pipelines that transport pure CO2 and CO2-mixtures have been performed and discussed.