Determination of green solvents’ water activity by inference of freezing point depression

Determination of green solvents’ water activity by inference of freezing point depression

WENG CHOH, Cheong, ZAKARIA Hamdi, ANTONIN Chapoy, BEHZAD Partoon

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Abstract. Deep eutectic solvents (DESs) are novel green solvents with great potential in many industrial applications. Due to their high tunability, DESs can be synthesized and prepared into various concentrations by dilution with water. This work revolutionises the determination of selected DESs’ water activity using inferencing their respective freezing point depression. Using the Hildebrand-Scott equation, the freezing point depression of the respective DESs in various concentrations is then correlated to the water activity. This inferential correlation provides an alternate but convenient way of determining a solution’s water activity in absence of a water activity meter. The highest freezing point depression of almost -10 oC was observed on the choline chloride and ethylene glycol in 1:2 molar ratio DES at 50 wt% concentration, with corresponding water activity determined at 0.909.

Green Solvents, Deep Eutectic Solvents, Water Activity, Freezing Point Depression

Published online 5/20/2023, 7 pages
Copyright © 2023 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA

Citation: WENG CHOH, Cheong, ZAKARIA Hamdi, ANTONIN Chapoy, BEHZAD Partoon, Determination of green solvents’ water activity by inference of freezing point depression, Materials Research Proceedings, Vol. 29, pp 337-343, 2023


The article was published as article 37 of the book Sustainable Processes and Clean Energy Transition

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