Table of Contents
Journal of Thermodynamics
Volume 2010, Article ID 583041, 6 pages
Research Article

Isotope Effect on Eutectic and Hydrate Melting Temperatures in the Water-THF System

1Department of Chemistry, Hamilton College, Clinton, NY 13323, USA
2Department of Chemical Engineering, The City College of the CUNY, NY 10031, USA

Received 24 July 2009; Accepted 3 December 2009

Academic Editor: Angelo Lucia

Copyright © 2010 C. Y. Jones et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Differential scanning calorimetry was used to study the effect of isotopic substitution on the eutectic and melting temperatures in the water-tetrahydrofuran (THF) system with THF molar fractions near the stoichiometry of the hydrate phase. Deuteration of the host causes an opposite effect from that of the guest with respect to the hydrate liquidus curve and eutectic melting temperature. The eutectic temperature in -containing systems is approximately 3.7 K higher than that in -containing systems. The melting temperatures of THF and deuterated THF hydrates increase by roughly 3.5 K with heavy water. The inclusion of deuterated THF causes a depression of the hydrate liquidus temperatures and a small but measurable effect on the eutectic temperature.