Complete determination of the solid (RI)-liquid equilibria of four consecutive n-alkane ternary systems in the range C14H30-C21H44 using only binary data
V. Metivaud et al., Complete determination of the solid (RI)-liquid equilibria of four consecutive n-alkane ternary systems in the range C14H30-C21H44 using only binary data, CAN J CHEM, 77(3), 1999, pp. 332-339
Citations number
21
Categorie Soggetti
Chemistry
Journal title
CANADIAN JOURNAL OF CHEMISTRY-REVUE CANADIENNE DE CHIMIE
The liquidus surfaces and thermal windows of four ternary systems implying
consecutive n-alkanes (for n between 14 and 21 carbon atoms) have been stud
ied combining Differential Scanning Calorimetry (DSC), X-ray experiments, a
nd calculation using the program Txy-CALC. From the DSC measurements, the t
ransition temperatures as well as the melting enthalpies have been determin
ed. X-ray experiments performed at temperatures just below melting have sho
wn that there is almost complete syncrystallization in the rotator form RI.
The calculation of the RI --> L liquidus surfaces has been made with tempe
rature-independent as well as temperature-dependent excess Gibbs energies.
In bath cases, the agreement between experimental and calculated data is ve
ry good, the average temperature difference being within the uncertainty of
the former.