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Liquid–vapour and fluid–solid phase transitions were experimentally determined under pressure on the system methane
+
a ternary waxy mixture using a full visibility cell. The wax was an approximately equimolar mixture of n-C
16, n-C
17 and n-C
18, the composition being chosen to obtain a mixture with an average molecular weight similar to heptadecane. Measurements were performed according to the synthetic method on different mixtures ranging from 0 to 99.5
mol% of methane. The liquid–solid phase transitions were investigated up to 100
MPa and fluid phase boundary was studied in the temperature domain from 293 to 373
K. Measurements performed on this pseudo-binary system were compared to the phase diagram of the binary system methane
+
heptadecane.