A mechanism for internal reflux in foam fractionation |
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| Institution: | 1. Centre for Advanced Particle Processing, University of Newcastle, Callaghan, NSW 2308, Australia;2. Department of Bioengineering, Hebei University of Technology, Tianjin 300130, China;1. Universidade Tiradentes – Unit, Programa de Pós-graduação em Engenharia de Processos – PEP, Av. Murilo Dantas, 300, CEP 49032-490 Aracaju, SE, Brazil;1. School of Chemical Engineering and Technology, Hebei University of Technology, No.8 Guangrong Road, Dingzi Gu, Hongqiao District, Tianjin, 300130, China;2. National-Local Joint Engineering Laboratory for Energy Conservation in Chemical Process Integration and Resources Utilization, School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin, 300130, China |
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| Abstract: | Multiple equilibrium stages can be engendered in foam fractionation, a process used for the enrichment of streams of proteins, by returning some of the foamate stream to the top of the column as external reflux liquor. However, it was recognised, 40 years ago that reflux could be autogenously created through the coalescence of bubbles in fractionation columns. By invoking the hydrodynamic theory of rising foam, we suggest a mechanism for the creation of internal reflux in foam fractionation. This method can give internal reflux rate as a function of bubble size. However, since the bubble size profile in a rising foam cannot be estimated, we cannot yet estimate how internal reflux varies with position in the column. |
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