Phase equilibria and diffusion behavior of high pressure CO2 in tetra-n-heptyl ammonium bromide

- Various phase equilibria of the [thepAm][Br]-CO2 system was measured and modeled.
- [thepAm][Br] shows the highest CO2 solubility among the reported after around 10 MPa.
- A D(c) model was proposed for CO2 absorption in [thepAm][Br] at high pressure.
- The diffusivity of CO2 in [thepAm][Br] is very pressure dependent.