H. Hammam et B. Sivik, PHASE-BEHAVIOR OF SOME PURE LIPIDS IN SUPERCRITICAL CARBON-DIOXIDE, The Journal of supercritical fluids, 6(4), 1993, pp. 223-227
The phase behavior of binary mixtures CO2-pure lipids has been determi
ned 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-CO
2 showed similar phase behavior concerning the three-phase line S-L1-V
which was displaced towards higher temperature for larger and more po
lar lipids. For the trilaurin (the shortest triglyceride)-CO2 system,
the three-phase line solid-liquid-vapor (S-L1-V) turned into a solid-l
iquid-liquid line (S-L1-L2) after passing through the quadruple point
(S-L1-L2-V) from which also the S-L2 and L1-L2-V lines originate. All
the lipids investigated showed a melting point depression of 15-25-deg
rees-C in the presence of carbon dioxide at high pressure.