On the local filtration properties of microcrystalline cellulose during dead-end filtration
Journal article, 2012
Dead-end filtration is frequently used in solid-liquid separation. In order to increase understanding of the filtration of materials that form compressible cakes, local filtration properties need to be taken into consideration. The compressible nature of these filter cakes requires phenomena such as skin formation, a dense layer of high filtration resistance close to the filter medium and flow stabilisation to be considered. This study investigates local filtration properties, i.e. the hydrostatic pressure and solidosity, in the dead-end filtration of microcrystalline cellulose, using slurries of varying pH levels and concentrations and two different filter media. The local measurements indicated that a dense skin was formed. This could be avoided when the nature of the particle-particle and particle-filter medium interactions was altered, using the pH to regulate the surface charge. Local filtration properties were used to find a critical material dependent Reynolds number indicating a flow stabilisation behaviour.
particles
model
compressible cake filtration
expression
pressure
porosity
Flow
stabilisation
Porous media
Skin formation
Mathematical modelling
Separation
suspensions
skin
Filtration
sedimentation
Author
Tuve Mattsson
Chalmers, Chemical and Biological Engineering, Forest Products and Chemical Engineering
Maria Sedin
Chalmers, Chemical and Biological Engineering, Forest Products and Chemical Engineering
Hans Theliander
Chalmers, Chemical and Biological Engineering, Forest Products and Chemical Engineering
Chemical Engineering Sciences
0009-2509 (ISSN)
Vol. 72 51-60Subject Categories (SSIF 2011)
Chemical Engineering
DOI
10.1016/j.ces.2012.01.022