Acetone‐stable nanofiltration membranes in deacidifying vegetable oil

Zwijnenberg, H.J.; Krosse, Anne Marie; Ebert, K.; Peinemann, Klaus‐Viktor; Cuperus, F.P.

doi:10.1007/s11746-999-0051-1

Cited by 90 publications

(40 citation statements)

References 11 publications

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“…The model predicts that hydrophobicity plays an important role in solvent flux; polar solvents (those with a high surface tension) are expected to have a low flux through hydrophobic membranes, and a high flux through hydrophilic membranes. Zwijnenberg et al [8] also report the importance of the surface energy difference in a study of polar and non-polar solvents with hydrophilic membranes. Permeation through the membrane pores is only possible when the difference in surface energy can be overcome by the applied pressure.…”

Section: Physical Transportmentioning

confidence: 99%

Solvent flux through dense polymeric nanofiltration membranes

Robinson

Tarleton

Millington

et al. 2004

Journal of Membrane Science

145

105

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Citation: ROBINSON, J.P. ... et al, 2004. Solvent flux through dense polymeric nanofiltration membranes.Journal of Membrane Science, 230 (1-2), pp. [29][30][31][32][33][34][35][36][37] Additional Information:• ABSTRACTThis work examines the flux performance of organic solvents through a polydimethylsiloxane (PDMS) composite membrane. A selection of n-alkanes, i-alkanes and cyclic compounds were studied in deadend permeation experiments at pressures up to 900 kPa to give fluxes for pure solvents and mixtures between 10 and 100 l m -2 h -1. Results for the chosen alkanes and aromatics, and subsequent modelling using the Hagen-Poiseuille equation, suggest that solvent transport through PDMS can be successfully interpreted via a predominantly hydraulic mechanism. It is suggested that the mechanism has a greater influence at higher pressures and the modus operandi is supported by the non-separation of binary solvent mixtures and a dependency on viscosity and membrane thickness. The effects of swelling that follow solvent-membrane interactions show that the relative magnitudes of the Hildebrand solubility parameter for the active membrane layer and the solvent(s) are a good indicator of permeation level. Solvents constituting a group (e.g. all n-alkanes) induced similar flux behaviours when corrections were made for viscosity and affected comparable swelling properties in the PDMS membrane layer.

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Section: Physical Transportmentioning

confidence: 99%

Solvent flux through dense polymeric nanofiltration membranes

Robinson

Tarleton

Millington

et al. 2004

Journal of Membrane Science

145

105

View full text Add to dashboard Cite

show abstract

“…The model predicts that hydrophobicity plays an important role in solvent flux; polar solvents (those with a high surface tension) are expected to have a low flux through hydrophobic membranes, and a high flux through hydrophilic membranes. Zwijnenberg et al [7] also report the importance of the surface energy difference in a study of polar and non-polar solvents with hydrophilic membranes. Permeation through the membrane pores is only possible when the difference in surface energy can be overcome by the applied pressure.…”

Section: Physical Transportmentioning

confidence: 99%

Nanofiltration of organic solvents

Robinson

Tarleton

Millington

et al. 2004

Membrane Technology

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This article provides an insight into the mechanisms affecting solvent flux through dense membranes, and forms a basis for rejection studies of organic solute compounds from organic solvents. ABSTRACTTransport mechanisms and process limitations are relatively well understood for aqueous nanofiltration systems. Much work has also been done on the use of membranes for the removal of suspended matter from organic solvents. The removal of organic solute compounds from organic solvents using membrane technology has been addressed by very few workers, and little is known of the fundamental transport and separation mechanisms.The work aims to enhance the understanding of non-aqueous nanofiltration by focusing on the flux performance of organic solvents through a dense 2 μm polydimethylsiloxane composite membrane. The flux of alcohols, n-alkanes, i-alkanes and cyclic compounds were studied in deadend mode, at pressures of 10-900 kPa. Fluxes of 10-80 l/m 2 h were obtained for alkanes and cyclic compounds, whereas alcohol flux was around two orders of magnitude lower. The results suggest that the solvent flux through polydimethylsiloxane takes place via two distinct mechanisms -namely hydraulic and chemical transport. Hydraulic transport appears to dominate at pressures above 300 kPa, whereas chemical transport becomes more apparent at lower pressures.Comparison of the hydraulic transport data with a Hagen-Poisuelle model gives good agreement for similar solvents. Swelling effects caused by solvent-membrane interactions are identified as playing a major role in solvent flux behaviour, and compressibility effects are also thought to account for deviations from the Hagen-Poisuelle model. Viscous flow was verified by a nonseparation of mixtures of n-alkane and cyclic compounds, which suggests that the polydimethylsiloxane layer cannot sustain a dense structure when used in organic solvent nanofiltration applications.

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“…Through experimental observations and the application of existing models, the authors concluded that convective transport can be significant and coupling of solvent and solute flows may take place. Other workers, for example, Zwijenburg et al 2 , Raman et al 11 , White 12 and Stafie et al 13 have also examined hexane/oil and hexane/aromatic systems, albeit in some cases with non-PDMS, more polar, membranes.…”

Section: Introductionmentioning

confidence: 99%