کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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621468 | 882557 | 2013 | 8 صفحه PDF | دانلود رایگان |
Solid–liquid separation by filtration and sedimentation are important operations used in a wide range of industries. One important characteristic of both the filtration and sedimentation processes is the solidosity of the filter cake/sediment that is formed, affecting the efficiency and design of the separation. In this study local solidosity was investigated using a γ-attenuation method during both filtration and sedimentation experiments for microcrystalline cellulose, a highly crystalline cellulose with particles of about 2–80 μm in diameter. Constitutive relationships for the solidosity were investigated using both filtration (i.e. cake build-up and expression) and sedimentation data for experiments at different pH and suspension concentrations. The sedimentation behaviour under these different conditions was also investigated. It was found that a three parameter empirical model could be used to describe the constitutive relationship between local solidosity and local solid compressible pressure for the sediment formed and the filter cake after both cake build-up and expression. This correlation worked well for the material investigated even at low solid compressible pressures.
► An empirical model could be used to describe the pressure dependence of solidosity.
► Sedimentation was useful when investigating compressible behaviour at low pressures.
► Using both sedimentation and filtration data was found to be advantageous.
► The sedimentation rate for the MCC was lower at high pH.
Journal: Chemical Engineering Research and Design - Volume 91, Issue 6, June 2013, Pages 1155–1162