Abstract Isothermal high-pressure (gas + liquid) phase equilibria were determined for five mixtures of (methanol + one of five gases). The five gases were hydrogen, nitrogen, methane, carbon monoxide, and carbon dioxide, and the measurements were performed at temperatures of 298.15, 323.15, and 373.15 K and pressures up to 100 MPa and for (carbon dioxide + methanol) at pressures up to the critical for the mixture. Six additional isotherms were determined for (carbon monoxide + methanol) at temperatures of 398.15, 423.15, 448.15, 473.15, and 498.75 K and pressures up to the critical; and two additional isotherms for (carbon dioxide + methanol) at temperatures of 423.15 and 473.15 K and again at pressures up to the critical. The densities of the liquid phase and in some cases for the gas phase as well are quoted. Two different experimental methods were adopted for the measurements: (a) by means of two high-pressure optical cells for moderate-to-high methanol mole fractions, (b) by gas chromatographic determination of composition at low methanol mole fractions.

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