On negative retentions in organic solvent nanofiltration

Postel, Stefanie; Spalding, G.; Chirnside, Morfula; Weßling, Matthias

doi:10.1016/j.memsci.2013.06.009

Cited by 60 publications

(47 citation statements)

References 26 publications

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“…Negative retention indicate that the solute is enriched in the permeate stream as compared to the bulk feed concentration (Postel et al, 2013). This means that, for those membranes, the selective barrier is offered to n-hexane rather than to macauba oil.…”

Section: Permeation Assaysmentioning

confidence: 99%

Evaluation of permeation of macauba oil and n-hexane mixtures through polymeric commercial membranes subjected to different pre-treatments

Penha

Rezzadori

Proner

et al. 2015

Journal of Food Engineering

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a b s t r a c tMacauba is a Brazilian palm tree with high edible oil productivity and of great interest to many applications. In the oil extraction process, solvent recovery is one point of major concern, due to its high energy consumption and oil quality losses. Those drawbacks can be partially overcome by integration of membrane technology to the usual solvent distillation step. The present work tested four ultrafiltration (UF) and one nanofiltration (NF) membrane (Microdyn-Nadir) on the solvent recovery of synthetic mixtures of macauba oil and n-hexane. Membranes were pre-treated before use with different solvents in specific time lengths, according to preliminary studies. The membrane performance was evaluated by permeate flux and oil retention. Macauba (pulp and kernel) oil was evaluated by determinations of acidity, peroxide value and fatty acid profile. Membranes showed usual flux behaviour, compatible with other studies concerning oil/solvent mixtures permeation, although its values were quite above the expected. Best results for retention (>30%) are related to the membranes with lower molar mass cut-off (MMCO), and the best balance between permeate flux and oil retention was found for the NF membrane (12.4 g m À2 h À1 , 34.7%).

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Section: Permeation Assaysmentioning

confidence: 99%

Evaluation of permeation of macauba oil and n-hexane mixtures through polymeric commercial membranes subjected to different pre-treatments

Penha

Rezzadori

Proner

et al. 2015

Journal of Food Engineering

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show abstract

“…The different chain flexibility compared to glassy polyimide/polyamide and rubbery silicone-coated membranes results in different sorption and swelling properties, which in turn results in different rejection profiles in OSN [21]. For both glassy and rubbery membranes, negative rejection has been demonstrated to be non-negligible under certain operating conditions, and the number of publications reporting negative rejection in non-aqueous nanofiltration has increased in recent years [16,21,[23][24][25][26][27]. However, the data on negative rejection available in the literature are mostly reported as observed data.…”

Section: Introductionmentioning

confidence: 99%

Predictive membrane transport models for Organic Solvent Nanofiltration: How complex do we need to be?

Marchetti

Livingston

2015

Journal of Membrane Science

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“…The MB retention was higher than RB having MB lower MW. It has been reported (Postel et al 2013, Volkov et al 2014) that dye rejection can be affected by solute-membrane interactions expressed in terms of solubility parameters. To analyze the effect of solute-membrane affinity on RB and MB rejections, the solute and the membrane solubility parameters (Table 2) were used.…”

Section: Membrane Contact Angles and Mwcomentioning

confidence: 99%

Simultaneous improvement in solvent permeability and deacidification of soybean oil by nanofiltration

et al. 2017

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In this paper, soybean oil deacidification and hexane removal using laboratory scale solvent resistance nanofiltration membranes based technique is presented. Composite nanofiltration membranes made of different polymers poly(vinylideneflouride) (PVDF), polydimethylsiloxane (SI), polycarbonate (PC), and glycerol were tested to remove the hexane and free fatty acid (FFA) from soybean oil/hexane miscella (oil feed solution 10, 25, and 35% w/w) at 20 bar of transmembrane pressure and 30°C, in a dead-end filtration set up. All membranes tested showed low fouling phenomena and high stability in the presence of hexane throughout the membrane pre-treatment and permeation procedure. The PVDF-10SI-1PC membrane showed the best performance achieving a miscella permeability of L m = 6.8 9 10 -6 L (h m bar) -1 , oil and FFA sieving efficiency of b (oil) = 0.21(80% of oil rejection) and b FFA = 2.43 (27% of FFA removal), respectively, at oil feed concentration of 25%. Apart from these specific properties, the PVDF-10SI-1PC membrane presented excellent mechanical and chemical resistances and low reversible fouling. The results demonstrate that membrane technology can attain a high efficiency in the simultaneous solvent recovery and deacidification of oil/ hexane miscella commonly processed in the soybean oil industry.

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On negative retentions in organic solvent nanofiltration

Cited by 60 publications

References 26 publications

Evaluation of permeation of macauba oil and n-hexane mixtures through polymeric commercial membranes subjected to different pre-treatments

Evaluation of permeation of macauba oil and n-hexane mixtures through polymeric commercial membranes subjected to different pre-treatments

Predictive membrane transport models for Organic Solvent Nanofiltration: How complex do we need to be?

Simultaneous improvement in solvent permeability and deacidification of soybean oil by nanofiltration

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