Processing vegetable oils using nonporous denser polymeric composite membranes

Subramanian, R.; Nakajima, Mitsutoshi; Raghavarao, K.S.M.S.; Kojima, Toshinori

doi:10.1007/s11746-004-0901-z

Cited by 47 publications

(43 citation statements)

References 24 publications

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“…The transport in denser membranes is completely controlled by the solution diffusion mechanism in applications such as gas separation, pervaporation and vapor permeation [8] and also in the case of solute-solvent systems and liquid mixtures. The permeability in a nonporous membrane P m is equal to…”

Section: Theorymentioning

confidence: 99%

“…While in the case of nonporous membranes, the separation is due to the solution-diffusion effect. Extensive studies carried out by our research group on processing vegetable oils using nonporous membranes have been reviewed recently [7,8]. These studies showed that hydrophobic nonporous membranes possess very high selectivity to separate PL from undiluted as well as hexane diluted oils.…”

Section: Introductionmentioning

confidence: 99%

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Laboratory Studies on Membrane Deoiling of Lecithin

Manjula

Subramanian

2008

J Americ Oil Chem Soc

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Deoiling of lecithin using a nonporous membrane was examined in a favorable solvent (hexane) medium with soy and rice bran lecithins. During the membrane process, the acetone insoluble (AI) content of soy lecithin increased from 63.2 to 81.0% in a single step batch operation. The membrane exhibited an excellent selectivity since phospholipid (PL) reverse micelles formed in the system were rejected almost completely due to low solubility probably aided synergistically by size exclusion. Diafiltration achieved greater oil removal from lecithin as reflected in terms of higher AI and PL contents in the deoiled lecithin. In discontinuous diafiltration, the PL content increased from 33.3 to 85.5% in rice bran lecithin (150% dilution to feed) and 56.6 to 85.7% in soy lecithin (200% dilution), respectively. The simulated continuous diafiltration run showed slightly greater PL content in soy lecithin (91.3%) compared to discontinuous diafiltration (89.7%) besides offering higher productivity. The membrane showed a color reduction of *60% in soy lecithin but there was no improvement in rice bran lecithin due to the retention of degradation products. The proposed integrated membrane process with nonporous (deoiling) and nanofiltration (solvent recovery) membranes could be an attractive preposition besides being an acetone free process.

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Section: Theorymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Laboratory Studies on Membrane Deoiling of Lecithin

Manjula

Subramanian

2008

J Americ Oil Chem Soc

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“…As a result, both capital and energy costs are high. One alternative is the FFA distillation method which improves the product quality, the elimination of soap stock, and effluent reduction; its disadvantage is that strict oil pretreatment is required (Subramanian et al 2004). Another potential solution is the use of hybrid processes, i.e.…”

Section: Introductionmentioning

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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“…A more stable product and thus with better quality can be obtained by using membranes (Subramanian et al, 2004;Ribeiro et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Solvent recovery from soybean oil/n-butane mixtures using a hollow fiber ultrafiltration membrane

Tres

Racoski

Nóbrega³

et al. 2014

Braz. J. Chem. Eng.

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-The aim of this work was the study on the separation of soybean oil/n-butane mixtures using a commercial hollow fiber ultrafiltration membrane (50 kDa). Oil/n-butane mixtures with mass ratios of 1:1 and 1:3 (wt), with the feed pressures of 5, 7 and 10 bar and transmembrane pressure of 1 bar were studied. Rejections of oil between 21 to 97.2%, oil fluxes between 0.04 and 0.98 kg/m 2 h and n-butane fluxes between 4 and 46 kg/m 2 h were observed, strongly influenced by the feed concentration. The increase in oil/n-butane mass ratio caused an increase in oil rejection and a decrease in the permeate flux of oil for most assays. The increase in the operating pressure caused an increase in oil flux and a consequent decrease in oil rejection. No degradation was observed in the membrane module during the operation with this non-aqueous feed stream, as confirmed by integrity tests.

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Processing vegetable oils using nonporous denser polymeric composite membranes

Cited by 47 publications

References 24 publications

Laboratory Studies on Membrane Deoiling of Lecithin

Laboratory Studies on Membrane Deoiling of Lecithin

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

Solvent recovery from soybean oil/n-butane mixtures using a hollow fiber ultrafiltration membrane

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