A Thermodynamic Investigation of Tripalmitin. Molar Heat Capacities of the α- and β-form between 10 K and 350 K

• Published in: Journal of chemical and engineering data Vol. 44; no. 4; pp. 721 - 726
• Main Authors: van Miltenburg, Johannes C, ten Grotenhuis, Erik
• Format: Journal Article
• Language: English
• Published: Washington, DC American Chemical Society 08.07.1999
• Subjects: Chemical thermodynamics; Chemistry; Elements, mineral and organic compounds; Exact sciences and technology; General and physical chemistry; Thermodynamic properties; Tripalmitin; Heat capacity; Entropy; Thermodynamic properties; Triglyceride; Transition energy
• ISSN: 0021-9568; 1520-5134
• DOI: 10.1021/je9802672

Molar heat capacities of two forms of tripalmitin (the α- and the β-forms) were measured between 10 K and 350 K. The enthalpy of fusion of the metastable α-form was calculated to be 108.4 kJ·mol-1 at a melting point of 318 K, according to differential scanning calorimetry measurements. For the stable β-form a value of 177.2 kJ·mol-1 was found at the melting temperature of 339.01 K. To get a consistent set of Gibbs energy values a zero entropy of (18 ± 2) J·K-1·mol-1 has to be assumed for the α-phase. The molar heat capacity of the liquid phase was represented by C p = {1100.15 + 1.866·T/K} J·K-1·mol-1.