Liquid Permeation through Plastic Films

Long, Robert Bryan

doi:10.1021/i160016a015

Cited by 90 publications

(31 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…To elucidate the mechanism of the pervaporatif transfer, several studies were carried out and the proposed models are in general very complex. However most authors agree on the three steps of the mechanism of pervaporation: sorption of molecules in the membrane at the upstream face, diffusion of these molecules through the membrane and finally their desorption in vapor phase (Long 1965, Fels &Huang 1971. Under our experimental conditions where the pressure downstream of the membrane is often maintained very low, the step of desorption is considered very fast and non-selective (Rautenbach & Albercht 1989).…”

Section: Introductionmentioning

confidence: 54%

Pervaporative transfer modeling through dense membranes validation of the scattered packet method

Essamri

Gouri

Zouair

et al. 2014

IJAC

View full text Add to dashboard Cite

The study of the diffusion through a homogeneous dense film, covers practically and theoretically a fundamental interest. In pervaporation (membrane separation process) the diffusion is the limiting step in the operation of the transfer and thus directly influences the performance of the membrane. The knowledge of the diffusion coefficient of an aqueous solution in a membrane makes it possible to elucidate the mechanism of this elementary step of pervaporation. Several methods were used to determine the diffusivity of a compound through a dense membrane (differential permeation, kinetic of sorption). In this work, we tried to validate the method of the scattered packet. It is about a digital method, of cellular automaton, which produces really the process of diffusion through a membrane using the second law of Fick in which the diffusion coefficient is considered constant. Permeation flux data obtained by simulation allowed validating this method. By using the method of relaxation time and the method of maximum slope, can thus determine the coefficient of diffusion of diffusing species through the membrane. Keywords: Diffusivity, Membrane, Pervaporation, Scattered Packet Method.

show abstract

Section: Introductionmentioning

confidence: 54%

Pervaporative transfer modeling through dense membranes validation of the scattered packet method

Essamri

Gouri

Zouair

et al. 2014

IJAC

View full text Add to dashboard Cite

show abstract

“…This situation was encountered by Long (1965), who studied the permeation of toluene, n-heptane, and methylcyclohexane in polypropylene, and by Berens (1 985), whose work is described above. In this case, the weight gain-time relation tends to be more linear.…”

Section: A 4 0 Hd and Associated Compoundsmentioning

confidence: 99%

“…The present authors consider this a valid approach for two reasons. First, Long (1965) indicates that, for liquids with low permeation rates, the liquid and vapor permeation rates should be equal. Second, liquid agent does not cover the entire surface, and the areas unexposed to liquid would be subject to vapor penetration from evaporating liquid.…”

Section: B-20 Absorption Into Polymeric Substrate Materialsmentioning

confidence: 99%

See 1 more Smart Citation

Background chemistry for chemical warfare agents and decontamination processes in support of delisting waste streams at the U.S. Army Dugway Proving Ground, Utah

Rosenblatt¹,

Small²,

Kimmell³

et al. 1996

View full text Add to dashboard Cite

“…Polymer s_below will_not_generally have essential characteristics (5) branched alkane (a) branches aliphatic > 4 carbons polyheptane, etc. (b) alicyclic polyvinylcyclohexane (c) branched poly (4MP) (d) aromatic PS (e) heteroatoms PVC, Saran…”

Section: Polyolefinsmentioning

confidence: 99%