Complete determination of the solid (RI)-liquid equilibria of four consecutive n-alkane ternary systems in the range C14H30-C21H44 using only binary data

Citation
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
ISSN journal
00084042 → ACNP
Volume
77
Issue
3
Year of publication
1999
Pages
332 - 339
Database
ISI
SICI code
0008-4042(199903)77:3<332:CDOTS(>2.0.ZU;2-6
Abstract
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.