Thermal Properties of Choline Chloride/Urea System Studied under Moisture-Free Atmosphere

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Physical chemistry of an archetypal deep eutectic solvent system, choline chloride/urea, was studied using dry components under moisture-free conditions. The phase diagram reveals that the eutectic melting point is 304.95 K (higher than any of the previously reported values to date), and a previously unrecognized phase region in the solid-liquid phase diagram, corresponding to a C1 → C2 transition (351.62 K) from α-choline chloride to β-choline chloride. Viscosities and densities, measured for the eutectic composition as a function of temperature, were compared with all data available in the literature, and discrepancies are discussed. Thermal stability studies reveal that the eutectic composition undergoes a thermal decomposition at temperatures as low as 363.15 K (mass loss rate of 0.411 wt % h-1), which calls for a careful consideration when using these solvents at elevated temperatures.
Original languageEnglish
Pages (from-to)5248-5255
Number of pages8
JournalJournal of Chemical and Engineering Data
Issue number12
Early online date05 Nov 2019
Publication statusEarly online date - 05 Nov 2019

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