Experimental investigation of the effect of nitrogen on the phase equilibrium behavior of the CH4–CO2 mixture at low temperature for natural and biogas purification

New fluid-fluid and solid-fluid(-fluid) equilibrium measurements at 4 MPa for the N2 + CH4 + CO2 system have been carried out using a static-analytic method in order to investigate the effect of nitrogen on the phase equilibrium behavior of the methane + carbon dioxide mixture at temperatures between 170 K and 210 K. With respect to equilibria involving solid carbon dioxide, the addition of nitrogen to the mixture reduces the solubility of...