Cross‐flow ultrafiltration of micellar surfactant solutions

Markels, John H.; Lynn, Scott; Radke, Clayton J.

doi:10.1002/aic.690410906

Cited by 38 publications

(31 citation statements)

References 30 publications

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“…The effect of osmotic pressure resulting from the high concentration gradient across the membrane is to reduce the effective transmembrane pressure drop, and therefore a reduction in the permeate flux should be expected (5). As seen from the present results, osmotic pressure due to chromate ions can be ignored since their presence increases the permeate flux and their concentration is low compared with that of the surfactant.…”

Section: Steady-state Characteristics Of the Separation Process And Smentioning

confidence: 58%

Chromate Removal from Water Using Surfactant-Enhanced Crossflow Filtration

Keskinler

Daniş

Çakıcı

et al. 1997

Separation Science and Technology

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Removal of chromate from water was investigated using the surfactant enhanced crossflow filtration technique in which the cationic surfactant, cetyl trimethylammonium bromide (CTAB), was the canier for the metal ions. The variation of chromate and surfactant rejections, and permeate flux with time were measured as a function of CTABkhromate concentration ratio, while maintaining a constant transmembrane pressure drop, membrane pore size, and pH of the feed solution. The method was found to be effective in removing chromate from water. It was observed that the efficiency of chromate removal increased with increasing CTAB/ chromate ratio. It was also found that the chromate concentration had a significant effect on the CTAB concentration in the permeate and on the time taken to establish the secondary membrane which consists of a highly viscous surfactant phase in the hexagonal state in the absence of chromate. In the presence of chromate. permeate flux increased at the same CTAB concentration although the surfactant and chromate rejections decreased, indicating lowering of the secondary membrane resistance to permeate flow. These conclusions were confirmed by dead-

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Section: Steady-state Characteristics Of the Separation Process And Smentioning

confidence: 58%

Chromate Removal from Water Using Surfactant-Enhanced Crossflow Filtration

Keskinler

Daniş

Çakıcı

et al. 1997

Separation Science and Technology

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“…Because of the concentration polarization, the concentration of surfactant on the retentate side of the membrane can reach high values that involve a significant osmotic pressure diference, as measured by Markels et al for CPC (16). As noted in the introduction, generally, when the pressure and feed surfactant concentration is increased or the retentate flux decreased, the concentration polarization layer becomes thicker and more intense, and the permeate composition changes.…”

Section: Permeate Flux and Cpc Concentration In The Permeatementioning

confidence: 89%

“…It is generally agreed that high retentate flow velocity or stirring speed yields a better rejection of surfactant (9,(14)(15)(16), which can be understood in terms of the concentration polarization attenuation that fast retentate flux produces. In contrast, the reported influence of pressure on surfactant rejection is highly varied.…”

Section: Introductionmentioning

confidence: 99%

“…In contrast, the reported influence of pressure on surfactant rejection is highly varied. The increase of surfactant permeate concentration as pressure increases has been variously explained by micelle deformation, micelle decomposition, and high surfactant concentration close to the membrane (9,14,16,17). The opposite observation has been explained by the presieving effect that concentration polarization sometimes causes on the surfactant molecules (18,19).…”

Section: Introductionmentioning

confidence: 99%

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Comparison of Polysulfone and Ceramic Membranes for the Separation of Phenol in Micellar-Enhanced Ultrafiltration

Sabaté

Pujolà

Llorens

2002

Journal of Colloid and Interface Science

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“…When their concentration reaches the CMC, they form micelles, while above the CMC, monomers and micelles are in equilibrium. Thus the transformation of the surfactant plays a major role in solute-membrane interactions which govern UF performance (7,8). Moreover, according to Bylin and Jonsson (9), the enhancement of concentration polarization created by surfactant adsorption at the membrane will strongly affect the permeate flux and rejection.…”

Section: Treatment Of Aqueous Ionic Surfactant Solutions By Dynamic Umentioning

confidence: 99%

Treatment of Aqueous Ionic Surfactant Solutions by Dynamic Ultrafiltration

Moulai‐Mostefa

Ding

Frappart

et al. 2007

Separation Science and Technology

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This paper investigates the reduction of concentration of an ionic surfactant (sodium dodecyl benzene sulfonate) present in an aqueous solution by ultrafiltration. A dynamic filtration system consisting of a metal disk rotating near a flat circular organic membrane was used in this study. Membranes cut off tested were 10, 20, and 50 kDa. The maximum rejection rate was 92% at 10 kDa. Permeate fluxes kept increasing with transmembrane pressure until at least 1400 kPa, reaching 400 Lh 21 m 22 at 10 kDa and 950 at 50 kDa for a rotation speed of 1000 rpm. However, raising the rotation speed above 500 rpm at 900 kPa had only a moderate effect on performance, indicating probably strong interactions between surfactant molecules and the membrane and that the permeate flux was mostly limited by pressure.

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Cross‐flow ultrafiltration of micellar surfactant solutions

Cited by 38 publications

References 30 publications

Chromate Removal from Water Using Surfactant-Enhanced Crossflow Filtration

Chromate Removal from Water Using Surfactant-Enhanced Crossflow Filtration

Comparison of Polysulfone and Ceramic Membranes for the Separation of Phenol in Micellar-Enhanced Ultrafiltration

Treatment of Aqueous Ionic Surfactant Solutions by Dynamic Ultrafiltration

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