In membrane filtration, theporesizeofthemembranedeterminesthesizeof ‘particles’ that shouldbe rejected,leading to accumulation of particles on the membrane surface and changed particle retention in time.A process without accumulation and thereby constant retention as function of time would be well suited for fractionation of components close in size. In this research ,emulsions consisting of small droplets (~2.0 mm) and large droplets(~5.5 mm), with total concentrations between 10% and 47%, were fractionated.The cross-flowmodul econsisted of a closed channel to allow particle stomigrate, followed by a membrane area with 20 mm poreswhere emulsion fractions could be removed. Under appropriate process conditions, the permeate consisted of only small droplets, at concentrations highe rthan in the original emulsion,leading to very high selectivities. Especially a thigh concentrations known to causes evere fouling in regular membrane filtration, these effects were occurring as a result of shear-induced diffusion of the droplets. If only small particles are targeted, the module can be operate dat fluxes of 40L/(m²/h); iffractionation is targeted the fluxes can be considerably higher. These fluxes are comparable to current operational fluxes, but here cross-flow velocity and trans-membrane pressure are much lower(corresponding to fluxesof1–4 m3/ (m²/h/bar)) with stable retentionand flux as function of time.
- cross-flow microfiltration
- concentrated suspensions
- membrane filtration
- poiseuille flow
van Dinther, A. M. C., Schroën, C. G. P. H., & Boom, R. M. (2013). Particle migration leads to deposition-free fractionation. Journal of Membrane Science, 440, 58-66. https://doi.org/10.1016/j.memsci.2013.03.050