Local filtration properties of microcrystalline cellulose: Influence of an electric field
Journal article, 2017

Mechanical dewatering through filtration can be problematic for materials that form compressible filter cakes and that have high specific surface areas. For this reason, dewatering is expected to be a major process challenge in the development of biorefineries aimed at producing materials with these characteristics. This study investigates the use of electrofiltration to dewater one such cellulosic material: a mechanically-modified microcrystalline cellulose. The local filtration properties were investigated during dead-end electrofiltration. The electric field was shown to decrease filter cake growth, which thereby decreased the filtration resistance. The application of an electric field during filtration was shown to improve the filtration rate of the microcrystalline cellulose to a greater extent than could be achieved by making changes to the pH of the suspension. The influence of ohmic heating and electrolysis reactions at the electrodes were considered and the influence of electroosmosis and electrophoresis on the filtration operation was described by an electrofiltration model.

Electrofiltration

Compressible filter cakes

Solid-liquid separation

Local filtration properties

Author

Jonas Wetterling

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

Tuve Mattsson

Wallenberg Wood Science Center (WWSC)

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

Hans Theliander

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

Wallenberg Wood Science Center (WWSC)

Chemical Engineering Sciences

0009-2509 (ISSN)

Vol. 171 368-378

Subject Categories

Chemical Engineering

DOI

10.1016/j.ces.2017.05.054

More information

Latest update

8/24/2018