Disregarding the minor deficiencies of the setup for measuring accurate equilibria the data clearly illustrates the importance of the low temperature route for HBCC, especially in the case of small mole fractions of CO 2 . An equilibrium value of just 1.5 mol% CO 2 in the vapor phase, measured at 57.4 bar and 233 K (cf. Fig. ) demonstrates that HBCC from a feed gas with as little as 5 mol% CO 2 is feasible even at such moderate temperature and pressure.