Role of membrane technology in biorefineries : dehydration of deep eutectic solvent by pervaporation
Valkama, Hanna; Muurinen, Esa; Ojala, Satu; Heiskanen, Juha P.; Sliz, Rafal; Laitinen, Ossi; Keiski, Riitta (2022-03-06)
Valkama, H., Muurinen, E., Ojala, S., Heiskanen, J., Sliz, R., Laitinen, O., & Keiski, R. (2022). Role of Membrane Technology in Biorefineries - Dehydration of Deep Eutectic Solvent by Pervaporation. Journal of Membrane Science and Research, 8(2), -. doi: 10.22079/jmsr.2022.545874.1525
© 2022 The authors. Articles published in Journal of Membrane Science and Research will be Open-Access articles distributed under the terms and conditions of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/).
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https://urn.fi/URN:NBN:fi-fe2023031732294
Tiivistelmä
Abstract
In this paper, the dehydration and purification of a deep eutectic solvent choline chloride-urea (ChCl-urea) by pervaporation is presented. The stability of polymeric pervaporation membranes was first studied by exposing the membranes to ChCl-urea for 5 days at 40 °C and 60 °C. The results showed that the membranes were stable when in contact with ChCl-urea and no membrane material was dissolved. In the dehydration experiments, the permeate fluxes were highest with the polydimethylsiloxane (PDMS) membrane: 267.65 g m-2 h-1 at 50 °C and 413.39 g m-2 h-1 at 60 °C. Raman spectroscopy was employed in the analysis of the samples. The results also showed the decomposition of ChCl-urea, and the presence of the decomposition products, i.e., ammonia and carbamate, in the PDMS and PDMS-PVA-TiO₂ permeates. With the highest permeate fluxes and simultaneous removal of water and decomposition products, PDMS appeared to be the most promising membrane for the purification and dehydration of ChCl-urea.
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