Book ChapterDOI
Recent advances in membrane science and technology
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A review dealing with recent advances in membrane science can be found in this paper, where the important topics of controlled release of chemicals from polymeric devices and removal of volatile monomers from addition polymers such as poly(vinyl chloride) and poly(acrylonitrile) are also treated.Abstract:
In this review dealing with recent advances in membrane science, the term “membrane” will be used to indicate any medium which acts as a barrier to transport into or out of a region, provides selective transfer of one species over another or regulates the transport of a material to its environment at a controlled rate. In addition to the common usage of the word “membrane” to indicate a dense polymer film, the above definition includes a variety of interesting cases such as highly porous ultrafiltration membranes and hydrophobic liquid membranes with selectivity properties which can be tailored by incorporation of materials which selectively complex with one of the species to be processed. The important topics of controlled release of chemicals from polymeric devices and removal of volatile monomers from addition polymers such as poly(vinyl chloride) and poly(acrylonitrile) are also treated here.read more
Citations
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Journal ArticleDOI
Correlation of separation factor versus permeability for polymeric membranes
TL;DR: In this paper, an analysis of the literature data for binary gas mixtures from the list of He, H2, O2, N2, CH4, and CO2 reveals an upper bound relationship for these mixtures.
Journal ArticleDOI
Microporous hollow fibers for gas absorption. I. Mass transfer in the liquid
Zhang Qi,Edward L Cussler +1 more
TL;DR: In this paper, a theory for the operation of hollow fiber membrane modules is developed, and mass transfer coefficients in the liquid phase are investigated, and the results show when the advantage of the increased area is greater than the disadvantage of the membrane resistance.
Journal ArticleDOI
Polymeric membrane materials for solution-diffusion based permeation separations
TL;DR: In this article, L'ultrafiltration et la microfiltration ne sont pas prises en compte en Compte, et le separation de gaz: dessalement, osmose inverse; membranes ioniques
Book ChapterDOI
Transport of Gases and Vapors in Glassy and Rubbery Polymers
TL;DR: In this paper, it was shown that the process of gas dissolution and diffusion in non-porous polymeric membranes is based on the so-called "solution-diffusion" concept, formulated in the 19th century.
Book ChapterDOI
Permeation of Gases and Vapours in Polymers
TL;DR: The solution and transport behavior of low molecular weight substances in polymeric materials is a topic of interest for many fields of science and technology as discussed by the authors. But the importance and relevance of such behaviour has become more apparent in recent years with the accelerating development of separation membrane systems, highly impermeable or selectively permeable packaging or barrier films, and the overall increase in the use of polymeric material for diverse applications with consequent exposure to various environmental agents.
References
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Book
The mathematics of diffusion
TL;DR: Though it incorporates much new material, this new edition preserves the general character of the book in providing a collection of solutions of the equations of diffusion and describing how these solutions may be obtained.
Book
The Properties of Gases and Liquids
TL;DR: In this article, the authors estimate physical properties of pure components and Mixtures and show that the properties of these components and mixtures are similar to those of ideal gases and liquids.
Journal ArticleDOI
Mechanism of sustained‐action medication. Theoretical analysis of rate of release of solid drugs dispersed in solid matrices
TL;DR: The analyses suggest that for the latter system the time required to release 50% of the drug would normally be expected to be approximately 10 per cent of that required to dissolve the last trace of the solid drug phase in the center of the pellet.
Journal ArticleDOI
Rate of release of medicaments from ointment bases containing drugs in suspension
TL;DR: An equation relating the rate of release of solid drugs suspended in ointment bases into perfect sinks is derived and the final expression is found to be surprisingly simple and convenient.