Abstract
The phase behavior of binary mixtures C0 2-pure lipids has been determined in the pressure range 50–210 bar. Homologous series of glycerides with increasing carbon number and increasing polarity (tri-, di-, and monoglycerides) were investigated. All the systems except trilaurin-C0 2 showed similar phase behavior concerning the three-phase line S- L 1- V which was displaced towards higher temperature for larger and more polar lipids. For the trilaurin (the shortest triglyceride)-C0 2 system, the three-phase line solid-liquid-vapor ( S- L 1- V) turned into a solid-liquid-liquid line ( S- L 1- L 2) after passing through the quadruple point ( S- L 1- L 2- V) from which also the S- L 2- V and L 1- L 2- V lines originate. All the lipids investigated showed a melting point depression of 15–25 °C in the presence of carbon dioxide at high pressure.
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