Computer simulation of membrane separartion processes

Lebrun, Rémi E.; Bouchard, Christian; Rollin, André L.; Matsuura, Takeshi; Sourirajan, S.

doi:10.1016/0009-2509(89)85067-5

Cited by 24 publications

(4 citation statements)

References 12 publications

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“…The observation that molecular weight distributions of natural organic matter determined by ultrafiltration commonly result in values which exceed those determined by other methods (28) may be explained, in part, by inadequate membrane calibration. It is well documented, experimentally and theoretically, that concentration polarization resulting from the accumulation of solute at membrane surfaces may significantly affect the mass-transfer properties of solutes in membrane separation processes (36). The mechanical properties of the solute "layer" at the membrane surface, having a greater concentration, Cm, than the bulk solution, Cf, govern the transport of hydrophilic macromolecules (32,37).…”

Section: Discussionmentioning

confidence: 99%

Transport and separation of organic macromolecules in ultrafiltration processes

Kilduff¹,

Weber²

1992

Environ. Sci. Technol.

134

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The membrane transport and separation characteristics of natural humic macromolecules and a model polyelectrolyte, polystyrene sulfonate), in ultrafiltration systems employing hydrophilic, neutral, cellulosic-type membranes were studied. The application of a permeation model based on membrane flux equations was systematically validated for charged, random-coil polymers. It was possible to characterize transport behavior of various solute/membrane combinations by a single membrane permeation factor, which was found to depend strongly on solution ionic strength, but to be relatively independent of the ultrafiltration operating mode. It was determined that under certain conditions of solution ionic strength, molecular weight cutoff specifications provided by manufacturers may significantly exceed actual values for random-coil polymers. The findings of the study are considered in the several contexts of methodologies for assessing macromolecule coiling characteristics, macromolecule sample fractionation, and molecular weight determinations for natural organic matter.

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Section: Discussionmentioning

confidence: 99%

Transport and separation of organic macromolecules in ultrafiltration processes

Kilduff¹,

Weber²

1992

Environ. Sci. Technol.

134

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“…With these velocity profiles the solute continuity equation was solved by the implicit finite-difference technique. Predictions in UF of the concentration polarization in a slit with laminar flow and a variable rejection coefficient have also been presented. , The first work 11 described the use of a nonconservative discretization method that, to ensure results independent of the grid, required much too fine grids. The anomalous results obtained were due to the lack of a systematic grid independence study.…”

Section: Introductionmentioning

confidence: 99%

Nanofiltration Mass Transfer at the Entrance Region of a Slit Laminar Flow

Semião¹,

Pinho²

1998

Ind. Eng. Chem. Res.

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A numerical model to predict laminar flows hydrodynamics and concentration polarization of salt aqueous solutions in a slit is proposed and experimentally validated. Physical modeling for the flow and for the mass transfer process is incorporated, in association with the osmotic pressure constitutive equation and a variation law for the membrane intrinsic rejection coefficient. The finite volume formulation is used with the SIMPLE algorithm to solve the discretized equations derived from the partial nonlinear differential equations of the mathematical model. The convection terms of the transport equations are discretized by the second-order hybrid central differences/upwind scheme. The experimental cell is a slit 200 mm × 30 mm × 2 mm that simulates the two-dimensional hydrodynamic flow conditions of the open feed channel of a spiral wound module. The predicted values at the hydrodynamic entrance region for different permeation velocities and rejection coefficients for sodium sulfate solutions, and for a single Schmidt number of 850, are compared against the corresponding experimental values and exhibit an excellent agreement. A new mass transfer correlation St p = 1 + 3.68 × 10-4(x/h)-1.11 Re 0.95 Re p -1.79 is proposed.

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“…Lebrun et al (12) used this model to examine the membrane process. In this model, the pores on the membrane surface are assumed equivalent to circular cylindrical pores, with or without pore size distribution; and the solute-membrane material interactions relative to solvent (water) are expressed in terms of the electrostatic surface potential function.…”

Section: Evaluation Of Membrane Pore Sizementioning

confidence: 99%

Treatment of Textile Dye Plant Effluent by Nanofiltration Membrane

Lebrun

Gallo

et al. 1999

Separation Science and Technology

Self Cite

143

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The study was concerned primarily with characterization of the NF45 membrane. Its pure water permeability, the mass transfer coefficient of NaCl, and the mean radius of the membrane pores were determined. Experiments run with five pure dye solutions and an industrial dye pulp solution confirmed the potential of nanofiltration membrane separation for the treatment of textile dye plant effluent. The effects of such significant parameters as initial solution concentration, transmembrane pressure, and type of dye on two fundamental characteristics of nanofiltration (flux and separation factor) were studied.

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Computer simulation of membrane separartion processes

Cited by 24 publications

References 12 publications

Transport and separation of organic macromolecules in ultrafiltration processes

Transport and separation of organic macromolecules in ultrafiltration processes

Nanofiltration Mass Transfer at the Entrance Region of a Slit Laminar Flow

Treatment of Textile Dye Plant Effluent by Nanofiltration Membrane

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