Abstract

Critical p(T) curves have been measured for the nine mixtures methane+, ethane+, ethene+, propane+, butane+, hexane+, octane+, decane+, and carbon dioxide + pyridine, and for the eight mixtures methane+, ethane+, ethene+, propane+, butane+, hexane+, octane+, and carbon dioxide + ethanoic acid. (Methane + ethanoic acid) and (methane or ethane or ethene + pyridine) exhibit an interrupted critical curve. The (liquid + liquid + gas) (llg) three-phase curve for (ethene + pyridine) extends over only a small temperature interval, namely ΔT = 7.2 K, between a lower (LCEP) and an upper critical end point (UCEP), both of which lie above the critical temperature of pure ethene. The p(T) projections of the (solid + liquid + gas) (slg) freezing-temperature depression curves were measured on hydrogen+, methane+, ethane+, ethene+, and carbon dioxide + ethanoic acid. The slg freezing-temperature depression curve for (methane + ethanoic acid) intersects the critical curve, which starts at the critical point of ethanoic acid, at a UCEP of 295.6 K and 102.5 MPa.

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