University of Oulu

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

Role of membrane technology in biorefineries : dehydration of deep eutectic solvent by pervaporation

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Author: Valkama, Hanna1; Muurinen, Esa1; Ojala, Satu1;
Organizations: 1Research Unit of Environmental and Chemical Engineering, University of Oulu, Finland
2Research Unit of Sustainable Chemistry, University of Oulu, Finland
3Optoelectronics and Measurement Techniques Laboratory, University of Oulu, Finland
4Research Unit of Fiber and Particle Engineering, University of Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 1.1 MB)
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Language: English
Published: Amirkabir University of Technology, 2022
Publish Date: 2023-03-17


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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Series: Journal of membrane science and research
ISSN: 2476-5406
ISSN-E: 2476-5406
ISSN-L: 2476-5406
Volume: 8
Issue: 2
Article number: 545874
DOI: 10.22079/JMSR.2022.545874.1525
Type of Publication: A1 Journal article – refereed
Field of Science: 215 Chemical engineering
Funding: The authors would like to thank the EU and the Council of Northern Ostrobothnia for financing the project under the frame of the European Regional Development Fund (ERDF) (Project number: A73930). The authors would also like to thank the project partners Kai-Cell Fibers Oy, Stora Enso Oulu Oy, Kemira Oyj, Kiertokaari Oy, and Pölkky Oyj for funding the project. Part of the work was carried out with the support of the Center of Microscopy and Nanotechnology, University of Oulu, Finland.
Copyright information: © 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 (