%0 Journal Article %T Role of Membrane Technology in Biorefineries - Dehydration of Deep Eutectic Solvent by Pervaporation %J Journal of Membrane Science and Research %I FIMTEC & MPRL %Z 2476-5406 %A Valkama, Hanna %A Muurinen, Esa %A Ojala, Satu %A Heiskanen, Juha P. %A Sliz, Rafal %A Laitinen, Ossi %A Keiski, Riitta %D 2022 %\ 04/01/2022 %V 8 %N 2 %P - %! Role of Membrane Technology in Biorefineries - Dehydration of Deep Eutectic Solvent by Pervaporation %K Pervaporation %K deep eutectic solvent %K ChCl-urea %K Biorefinery %K Raman spectroscopy %R 10.22079/jmsr.2022.545874.1525 %X 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. %U https://www.msrjournal.com/article_250831_7693df1eb4003d7c727edb02a9e6e1f0.pdf