Electroosmotic dewatering of cellulose nanocrystals
Journal article, 2018

One of the main challenges for industrial production of cellulose nanocrystals is the high energy demand during the dewatering of dilute aqueous suspensions. It is addressed in this study by utilising electroosmotic dewatering to increase the solid content of suspensions of cellulose nanocrystals. The solid content was increased from 2.3 up to 15.3 wt%, i.e. removal of more than 85% of all the water present in the system, at a much lower energy demand than that of thermal drying. Increasing the strength of the electric field increased not only the dewatering rate but also the specific energy demand of the dewatering operation: the electric field strength used in potential industrial applications is thus a trade-off between the rate of dewatering and the energy demand. Additionally, it was fo und that high local current intensity had the potential of degrading cellulose nanocrystals in contact with the anode. The maximum strength of the electric field applied should therefore be limited depending on the equipment design and the suspension conditions.

Solid–liquid separation

Cellulose nanocrystals

Nanocellulose

Energy demand

Electroosmotic dewatering

Author

Jonas Wetterling

Wallenberg Wood Science Center (WWSC)

Chalmers, Chemistry and Chemical Engineering, Chemical Technology, Forest Products and Chemical Engineering

Karin Sahlin

Chalmers, Chemistry and Chemical Engineering, Chemistry and Biochemistry, Organic Chemistry

Wallenberg Wood Science Center (WWSC)

Tuve Mattsson

Chalmers, Chemistry and Chemical Engineering, Chemical Technology, Forest Products and Chemical Engineering

Wallenberg Wood Science Center (WWSC)

Gunnar Westman

Wallenberg Wood Science Center (WWSC)

Chalmers, Chemistry and Chemical Engineering, Chemistry and Biochemistry

Hans Theliander

Wallenberg Wood Science Center (WWSC)

Chalmers, Chemistry and Chemical Engineering, Chemical Technology, Forest Products and Chemical Engineering

Cellulose

0969-0239 (ISSN)

Vol. 25 4 2321-2329

Subject Categories

Energy Engineering

Other Environmental Engineering

Energy Systems

DOI

10.1007/s10570-018-1733-3

More information

Latest update

2/11/2021