Analysis of the Porosity of Filter Cakes Obtained by Filtration of Colloidal Suspensions
| Autor: | Harald Anlauf, Johannes Ruland, Hermann Nirschl, Mark Hieke |
|---|---|
| Rok vydání: | 2009 |
| Předmět: |
Particle system
Materials science General Chemical Engineering Analytical chemistry General Chemistry Industrial and Manufacturing Engineering Darcy–Weisbach equation law.invention Filter cake Colloid Chemical engineering Compressible material Filter (video) law ddc:660 Composite material Porosity Filtration |
| Zdroj: | Chemical engineering & technology, 32 (7), 1095-1101 |
| ISSN: | 1521-4125 0930-7516 |
| DOI: | 10.1002/ceat.200800609 |
| Popis: | The filtration of suspensions in the colloidal regime is part of many processes. It is necessary due to the widespread use of nano-size particles in many applications. In nano-scale particle systems, the huge specific surface of the particles is dominating the processes. The question is whether the well-known filter theory is applicable for such type of products. The experiments in this study were conducted by gas-driven filtration. The analysis of the filter cake was done globally according to the Darcy equation and locally by the use of magnetic resonance imaging (MRI) techniques. Due to the very high resistances during filtration for colloidal suspensions, comparatively thin filter cakes with an approximate height of 0.5–3 mm were investigated. The overall porosities determined by the different techniques are in good agreement. The MRI technique allows an in situ measurement of the porosity gradient within a filter cake formed by compressible material. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Plný text