On the local filtration properties of microcrystalline cellulose during dead-end filtration
Artikel i vetenskaplig tidskrift, 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.

stabilisation

Separation

Porous media

suspensions

Flow

particles

Skin formation

Filtration

sedimentation

expression

pressure

porosity

model

Mathematical modelling

skin

compressible cake filtration

Författare

Tuve Mattsson

Wallenberg Wood Science Center (WWSC)

Chalmers, Kemi- och bioteknik, Skogsindustriell kemiteknik

Maria Sedin

Chalmers, Kemi- och bioteknik, Skogsindustriell kemiteknik

Hans Theliander

Chalmers, Kemi- och bioteknik, Skogsindustriell kemiteknik

Wallenberg Wood Science Center (WWSC)

Chemical Engineering Sciences

0009-2509 (ISSN)

Vol. 72 51-60

Ämneskategorier

Kemiteknik

DOI

10.1016/j.ces.2012.01.022