Temperatures and enthalpies of (solid  +  solid) and (solid  +  liquid) transitions of n-alkanes

✍ Scribed by Michel Dirand; Mohammed Bouroukba; Anne-Julie Briard; Virginie Chevallier; Dominique Petitjean; Jean-Pierre Corriou

• Publisher: Elsevier Science
• Year: 2002
• Tongue: English
• Weight: 650 KB
• Volume: 34
• Category: Article
• ISSN: 0021-9614
• DOI: 10.1006/jcht.2002.0978

✦ Synopsis

A general review of temperatures and enthalpies of (solid + solid) and (solid + liquid) transitions of pure normal alkanes is presented. Mean values are determined from literature data on pure normal alkanes for methane up to the alkane of carbon atom number n equal to 390. Melting temperatures and (solid + liquid) and (solid + solid) transition enthalpies are expressed as a function of the carbon atom number n. Broadhurst's models are fitted again using 67 melting temperatures from methane up to the normal alkane of carbon atom number n = 390 and it is shown that the enthalpy difference between the ordered phase and the liquid phase varies linearly as a function of the carbon atom number n whatever its parity; the same behaviour is observed for the melting enthalpy difference when fusion corresponds to a state change (disordered phase → liquid).