Homogeneous phase transfer catalyst recovery and re-use using solvent resistant membranes

Luthra, Satinder Singh; Yang, Xiaojin; Santos, L. M. Freitas dos; White, Lloyd S.; Livingston, Andrew G.

doi:10.1016/s0376-7388(01)00704-9

Cited by 60 publications

(17 citation statements)

References 11 publications

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“…In this case conformational changes and aggregation of polymer chains may occur depending on the composition of the solvent. These effects are of relevance for instance in homogeneous catalysis [32][33][34][35][36][37][38] where often polymer supported catalysts are applied or in polymer fractionation.…”

Section: Introductionmentioning

confidence: 99%

Fundamental studies on the performance of a hydrophobic solvent stable membrane in non-aqueous solutions

Ebert

Koll

Dijkstra

et al. 2006

Journal of Membrane Science

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Section: Introductionmentioning

confidence: 99%

Fundamental studies on the performance of a hydrophobic solvent stable membrane in non-aqueous solutions

Ebert

Koll

Dijkstra

et al. 2006

Journal of Membrane Science

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“…17,19,20).Luthra et al (19) noted a drop in flux from 23 to 15 LMH in 120 min for pure toluene at 30 atm of pressure.…”

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confidence: 99%

Deacidification of soybean oil using supercritical fluid and membrane technology

Artz

Kinyanjui

Cheryan

2005

J Americ Oil Chem Soc

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Membrane processing has been used for oil purification, but low flux and membrane instability are major impediments. A technique that combines membrane processing and supercritical CO 2 was investigated. A specialized, high-pressure, dead-end membrane cell was designed, fabricated, and connected to two ISCO (Lincoln, NE) supercritical fluid extraction (SFE) systems. The cell has a base with a grooved bottom for permeate removal, plus a porous metal disc for membrane support; a cell body with threaded connections; and a cap with an inlet assembly. One SFE pump provided the appropriate pressure on the feed stream, the second maintained pressure on the permeate at a slightly lower pressure. The sample consisted of 50% TAG and 50% FFA. For example, for separations at 45°C and a transmembrane pressure of 7 atm, the β (selectivity factor) values (TAG, FFA) for the SE and BW membranes were 0.56, 3.63 and 0.60, 2.63, respectively, whereas the β values (TAG, FFA) for the DK and NF90 membranes were 0.58, 1.37 and 0.70, 1.28, respectively.Paper no. J11076 in JAOCS 82, 803-808 (November 2005).

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“…Despite the reductions of permeance and rejection, the composite membranes showed a promising operation stability when compared to the other literature. 39,40 3.5. Concentration of Lotus Seedpod Proanthocyanidins.…”

Section: Resultsmentioning

confidence: 99%

Tuning the Performance of Composite Membranes by Optimizing PDMS Content and Cross-Linking Time for Solvent Resistant Nanofiltration

Zhang

et al. 2015

Ind. Eng. Chem. Res.

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Herein, a series of composite membranes with optimized solvent permeance and rejection are prepared by combining the advantages of hybridization and cross-linking techniques. Polyethylenimine (PEI) and hydroxyl terminated trifluoride polydimethylsiloxane (PDMS) are cross-linked with trimesoyl chloride as the skin layer, which is isotropic rather than hierarchical. The chain mobility of PEI is inhibited upon hybridization and cross-linking, affording enhanced solvent resistance and thermal/mechanical stabilities. The composite membrane achieves high rejection ability with the rejection of PEG 1000 of about 100%. Additionally, the synergy of hydrophilic PEI and hydrophobic PDMS segments gives acceptable solvent permeances for acetone (up to 2.7 L m −2 h −1 bar −1 ) and ethyl acetate (up to 1.4 L m −2 h −1 bar −1 ). The membrane microstructures are facilely tuned by regulating PDMS content and cross-linking time, allowing the efficient optimization of solvent resistant nanofiltration performances. Moreover, the operational stability and the separation of lotus seedpod proanthocyanidins−ethanol/water mixtures are investigated to evaluate the practical application of the composite membrane.

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Homogeneous phase transfer catalyst recovery and re-use using solvent resistant membranes

Cited by 60 publications

References 11 publications

Fundamental studies on the performance of a hydrophobic solvent stable membrane in non-aqueous solutions

Fundamental studies on the performance of a hydrophobic solvent stable membrane in non-aqueous solutions

Deacidification of soybean oil using supercritical fluid and membrane technology

Tuning the Performance of Composite Membranes by Optimizing PDMS Content and Cross-Linking Time for Solvent Resistant Nanofiltration

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