Dangers of lab-plant scaleup for filters involving solidliquid systems |
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| Authors: | Frank M. Tiller Wenping Li Carina Alles |
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| Affiliation: | 1. Department of Chemical Engineering , University of Houston , Houston, Texas;2. E. I. Du Pont de Nemours and Company, Inc. , Wilmington, Delaware |
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| Abstract: | Many laboratory procedures have been used for predicting the size of clarifiers, thickeners, filters, and centrifuges or choosing the optimum quantity of filter-aid and flocculants. Scaleup predictions are frequently based on experiments involving small pressure and vacuum filters, compression-permeability cells, and sedimentation rates. Among major problems related to the accuracy of scaleup are: (1) unrepresentative sampling, (2) aging of suspensions with accompanying changes in properties of cakes and sediments, (3) effect of sedimentation not included in theoretical equations, (4) wall effects in small diameter filters and cells, and (5) misapplication of theory to experiment. |
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