Nanofiltration studies of larger organic microsolutes in methanol solutions

Whu, J.A.; Baltzis, Basil C.; Sirkar, Kamalesh K.

doi:10.1016/s0376-7388(99)00374-9

Cited by 143 publications

(75 citation statements)

References 9 publications

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“…Whilst the authors believe this to be a unique finding for alcohols mixed with other solvents, several independent researchers have previously reported increased rejection with pressure for solvent/solute combinations [8,34,35]. It is noted that the order in which the data appear in Figure 8 is non-sequential in terms of ethanol concentration although entirely consistent with the bellshaped curves in Figure 3.…”

Section: Effects Of Filtration Pressuresupporting

confidence: 56%

The influence of polarity on flux and rejection behaviour in solvent resistant nanofiltration—Experimental observations

Tarleton

Robinson

Millington³

et al. 2006

Journal of Membrane Science

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The separation characteristics of a dense polydimethylsiloxane (PDMS) membrane were studied using mixtures comprising xylene, cyclohexane or n-heptane with oxygenate components at concentrations up to 75%. The effects of polarity on flux and rejection performance were determined through a test matrix of solvent type, concentration, filtration pressure, crossflow rate and the degree of membrane crosslinking.In all cases involving alcohols, the more polar compound in the feed mixture was partially rejected by the membrane and the extent of rejection was dependent on the polarity as quantified by solubility parameter. The rejection-concentration profiles for several alcohol/solvent mixtures exhibited a maximum, with the highest rejection around 30%. Mixtures containing MTBE did not separate, i.e. no rejection was observed.Rejection increased with increasing pressure and crossflow rate but was largely unaffected by the degree of membrane crosslinking. Component flux was affected by the oxygenate concentration in the mixture, which was attributed in part to changes in the degree of membrane swelling with composition. Experimental findings suggest that the separation is primarily governed by multicomponent solvent/oxygenate/membrane swelling equilibria, and results compare favourably with swelling isotherms available in the open literature.

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Section: Effects Of Filtration Pressuresupporting

confidence: 56%

The influence of polarity on flux and rejection behaviour in solvent resistant nanofiltration—Experimental observations

Tarleton

Robinson

Millington³

et al. 2006

Journal of Membrane Science

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show abstract

“…Several researchers have reported increasing solute rejection at raised pressures [3,4,8,16], and some have taken this to be indicative of a solution-diffusion transport mechanism [17]. Other workers have reported non-linear solvent flux/pressure relationships that deviate from Darcy's Law [18][19][20] and some have attributed deviations to membrane compaction [18].…”

Section: Pure Solventsmentioning

confidence: 99%

“…For example, the development of polymeric solvent resistant nanofiltration (SRNF) membranes has attracted much attention and enabled several potential applications in the processing of organic solvent streams [1][2][3][4]. Although precise transport mechanisms across the convection-diffusion spectrum are an ongoing topic of debate, it is generally accepted that polymer swelling plays a significant role in determining levels of flux and rejection [2,5,6].…”

Section: Introductionmentioning

confidence: 99%

New experimental measurements of solvent induced swelling in nanofiltration membranes

Tarleton

Robinson

Smith

et al. 2005

Journal of Membrane Science

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“…They have proposed a resistance in series approach for predicting results and used several parameters like viscosity and surface tension to predict the influence on flux data. Whu et al [8] studied performance of nanofiltration membrane with methanol and reported that membranes initially exhibit considerable time dependence for change in flux and rejection while becoming time invariant later on. Recently, Shukla and Cheryan [9] reported studies on UF of organic solvents.…”

Section: Introductionmentioning

confidence: 99%

Effects of ethanol concentration on flux and gel formation in dead end ultrafiltration of PEG and dextran*1

ZAIDI

2004

Journal of Membrane Science

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The phenomenon of concentration polarization and gel formation plays an important role in ultrafiltration of macromolecules from water. However, there is lack of studies on similar phenomena for macromolecule ultrafiltration from blends of aqueous and non-aqueous solvents. This paper reports the effect of ethanol concentration on flux in ultrafiltration of polyethylene glycol and dextran with a solvent resistant polymeric membrane. Transient filtration data, collected after steady state, was utilized to determine actual filtration resistance and contribution of polarization using the osmotic pressure model. It was observed that both steady state flux and gel formation were significantly influenced in the ultrafiltration of both PEG and dextran from blended solvents. It was also observed that the onset of gel formation for PEG and concentration polarization for dextran in blended solvents occurred at significantly higher bulk solute concentrations than in water alone.

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Nanofiltration studies of larger organic microsolutes in methanol solutions

Cited by 143 publications

References 9 publications

The influence of polarity on flux and rejection behaviour in solvent resistant nanofiltration—Experimental observations

The influence of polarity on flux and rejection behaviour in solvent resistant nanofiltration—Experimental observations

New experimental measurements of solvent induced swelling in nanofiltration membranes

Effects of ethanol concentration on flux and gel formation in dead end ultrafiltration of PEG and dextran*1

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