Influence of sorption and diffusion of aroma compounds in silicone rubber on their extraction by pervaporation

Lamer, Thierry; Rohart, M.S.; Voilley, Andrée; Baussart, H.

doi:10.1016/0376-7388(94)80075-8

Cited by 45 publications

(31 citation statements)

References 13 publications

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“…These results will be useful in order to globally model the mass transfer in such a device in which at least three successive steps can be identified : first, the species to extract (aroma compounds in the work of Lamer et al [21]) are transferred from the liquid to the membrane surface, then cross the membrane before being transferred to the gaseous phase on the other side of the pervaporation membrane. …”

Section: Resultsmentioning

confidence: 98%

“…The bottom of this cavity supports a second rectangular nickel plane plate, also 150 mm long, acting as cathode on which overall mass transfer has to be investigated. This cathode simulates the pervaporation membrane of the experimental facility previously used by Lamer et al [21]. In this previous work, the depth, H, of the cavity supporting the membrane was kept constant and equal to 3 mm.…”

Section: Electrochemical Cell and Flow Loopmentioning

confidence: 99%

“…The electrochemical cell, mimicking the geometry of a pervaporation membrane process device previously used by Lamer et al [21] in order to extract aroma compounds, is presented in Fig. 1.…”

Section: Electrochemical Cell and Flow Loopmentioning

confidence: 99%

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Experimental Determination of Mass Transfer at the Active Surface of a Membrane Pervaporation Cell

Vachon

Legentilhomme²,

Lamer³

2000

Chem. Eng. Technol.

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This work is dedicated to an experimental study of overall mass transfer at the bottom of a rectangular cavity subjected to forced convective flow at its mouth. Mass transfer coefficients have been measured using an electrochemical method for different aspect ratios, H/h, between the depth of the cavity to the height of the upstream channel, range between 0.5 and 1.67. Reynolds number, based on the hydraulic diameter of the upstream duct, has been varied from 1 to 3000 and Schmidt number between 1010 and 8400. Overall mass transfer at the bottom edge of the cavity is found to increase with both Reynolds and Schmidt numbers and to decrease with the aspect ratio, H/h. General correlations taking into account these different parameters have been established in order to predict mass transfer at the bottom of the cavity. This work is the first part of a global investigation of a pervaporation membrane separation cell involving mass transfer in liquid phase at one side of the membrane surface, followed by a transfer of the species across the membrane and finally vaporization on the downstream side of the membrane occurs.

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Section: Resultsmentioning

confidence: 98%

Section: Electrochemical Cell and Flow Loopmentioning

confidence: 99%

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Experimental Determination of Mass Transfer at the Active Surface of a Membrane Pervaporation Cell

Vachon

Legentilhomme²,

Lamer³

2000

Chem. Eng. Technol.

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“…There are also other promising applications in the food industry such as aroma recovery and beer dealcoholization. 21,22 Other applications of pervaporation are for separation of mixed organic solvents 23,24 and organic vapor separation from contaminated air. 25,26 Zeolites have been conventionally used as catalysts, ion exchangers, and adsorbents.…”

Section: Introductionmentioning

confidence: 99%

Characterization and performance evaluations of sodium zeolite‐Y filled chitosan polymeric membrane: Effect of sodium zeolite‐Y concentration

Ahmad

Nawawi

2005

J of Applied Polymer Sci

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Sodium zeolite-Y (NaY zeolite) filled chitosan polymeric membranes were developed and characterized. The impact of adding different concentrations of NaY zeolite into the homogeneous chitosan membrane was investigated. The surface morphology, mechanical-physical properties, sorption, and pervaporation performance for the dehydration of isopropanol-water mixture separation by the pervaporation process were studied and evaluated. A homogeneous chitosan membrane showed preferential water sorption and permeation compared to isopropanol. The optimum concentration of NaY zeolite added to the homogeneous chitosan membrane was 0.4 wt %, which showed that the dispersion of the NaY zeolite was the most homogeneous and finely covered by the chitosan polymer in the zeolite-chitosan polymer interface. The tensile strength and percent strain at maximum of this membrane were 59.347 MPa and 27.5%, respectively. The sorption experiments showed that the degree of swelling was 6.54% with 1.01 wt % isopropanol sorbed in these membranes. The pervaporation separation tests demonstrated that the NaY zeolite filled chitosan membrane was capable for isopropanol-water mixture separation and improved the pervaporation separation index from 272 (homogeneous chitosan membrane) to 2687.

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“…43,44,46 Because the molecular volume of VOCs is larger than that of water and the penetrate quickly permeates a rubbery membrane like PDMS, permselectivity was not affected by the diffusivity. 20,32,34,36,37 Solubility significantly affects the permselectibity in pervaporation through a hydrophobic rubbery membrane. 20,32,34,36,37 Fluorinated polymers have also been studied as an organic aqueous mixture separation membrane expected to show excellent affinity for organic compounds due to their hydrophobicity based on their low surface energy.…”

Section: Introductionmentioning

confidence: 99%

Characterization of graft polymerization of fluoroalkyl methacrylate onto PDMS hollow‐fiber membranes and their permselectivity for volatile organic compounds

Mishima

Nakagawa

2003

J of Applied Polymer Sci

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Polydimethylsiloxane (PDMS) hollow-fiber membranes grafted with 1H,1H,9H-hexadecafluorononyl methacrylate (HDFNMA), which is a fluoroalkyl methacrylate, using a 60 Co irradiation source, were characterized and applied to pervaporation. The PDMS hollow-fiber membranes were filled with N 2 gas and sealed. The membranes and the HDFNMA solution were then irradiated simultaneously. In the HDFNMA solution, graft polymerization was performed. The degree of grafting of the outside surface of the hollow fiber was greater than that in the inside surface of the hollow fiber. In the grafted PDMS hollow-fiber membranes, the best separation performance was shown due to the introduced hydrophobic polymer, poly(HDFNMA). The grafted membrane had a microphase-separated structure, that is, a separated structure of PDMS and graft-polymerized HDFNMA. The permeability of molecules in the poly-(HDFNMA) phase was so low that the diffusion of molecules was prevented in the active layer with many poly(H-DFNMA) domains, as the feed solution was introduced through the inside of the hollow fibers and the outside was vacuumed. As the feed solution was introduced through the outside of the hollow fibers and the inside was vacuumed, the diffusion of molecules was not prevented in the active layer with few poly(HDFNMA) domains.

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Influence of sorption and diffusion of aroma compounds in silicone rubber on their extraction by pervaporation

Cited by 45 publications

References 13 publications

Experimental Determination of Mass Transfer at the Active Surface of a Membrane Pervaporation Cell

Experimental Determination of Mass Transfer at the Active Surface of a Membrane Pervaporation Cell

Characterization and performance evaluations of sodium zeolite‐Y filled chitosan polymeric membrane: Effect of sodium zeolite‐Y concentration

Characterization of graft polymerization of fluoroalkyl methacrylate onto PDMS hollow‐fiber membranes and their permselectivity for volatile organic compounds

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