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Membrane concepts

Membrane reactors [25] and catalytic distillation [26] are two options for even closer integration of isomerization and separation. The membrane concept is... [Pg.483]

Cince the introduction by Mueller et al. (11) of a method for producing black lipid films, the study of black lipid films has expanded rapidly. Numerous publications have appeared in which these films are used to study physicochemical properties, others in which they are used as a model for biological membranes. Survey articles have been published by Mueller et al. (12), by Thompson (18), and more recently by Tien and Dawidowicz (19). As a model for a cellular membrane the black lipid film is bound to be a poor model since it lacks an essential part of even the simplest membrane conception, the polyelectrolyte coating. One of the few properties of black lipid membranes within biological ranges is its water permeability (4, 5, 6, 20). [Pg.106]

Thus, a poly isobutylene coating on silver halide optical fiber was used for environmental analysis of chlorinated hydrocarbons in water in an instrument designed for operation in seawater 500 m under the surface (Fig. 9.27). The enrichment membrane concept can be used for FTIR-ATR analysis of liquid and gaseous samples alike. [Pg.296]

Reaction type Example Conditions Limitations Membrane concept... [Pg.395]

Kusumi A, et al. Paradigm shift of the plasma membrane concept from the two-dimensional continuum fluid to the partitioned fluid high-speed single-molecule tracking of membrane molecules. Ann. Rev. Biophys. Biomolec. Struct. 2005 34 351-378. [Pg.1016]

Kusumi A, Nakada C, Ritchie K, Murase K, Suzuki K, Mu-rakoshi H, Kasai RS, Kondo J, Fujiwara T. Paradigm shift of the 35. plasma membrane concept from the two-dimensional continuum... [Pg.2092]

A. Andersen, J.M. Dahl, KJ. Jens. E. Rytter, A. Slagtem, and A. Solbakken, Hydrogen acceptor and membrane concept for direct methane conversion, Catal. Today 4 389 (1989). S. Uemiya, N. Sato, H. Ando, T. Matsuda, and E. Kikuchi, Promotion of methane steam reforming by use of palladium membrane, Sekiyu Gakkaishi JJ 418 (1990). [Pg.462]

FIGURE 6.10 Different membrane concepts for oxygen-ion conducting membranes, (a) Dense mixed conducting membrane top-layer supported on an asymmetric macroporous support (b) dense self-supported mixed conducting membrane with graded porous interfaces and (c) solid electrolyte cell (oxygen pump). [Pg.146]

Kusakabe et al.83 proposed selective CO oxidation membrane concept to facilitate SMR reaction. Yttria-stabilized zirconia (YSZ) membrane was deposited on the surface of a porous alumina support tube by sol-gel procedure. This again was impregnated with Pt and Rh aqueous solution to produce a Pt- or Rh-loaded YSZ membrane. With addition of 02 in the feed, oxidation of CO can bring CO concentration to the level appropriate for PEMFC (<30ppm). [Pg.35]

In this section, a brief overview is given of major membrane concepts and materials. Besides membranes made from a mixed ionic-electronic conductor (MIEC), other membranes incorporating an oxygen ion conductor are briefly discussed. Data from oxygen permeability measurements on selected membrane materials are presented. [Pg.436]

Fig. 10.1. Different membrane concepts incorporating an oxygen ion conductor (a) mixed conducting oxide, (b) solid electrolyte cell (oxygen pump), and (c) dual-phase membrane. Also shown is the schematics of an asymmetric porous membrane (d), consisting of a support, an intermediate and a barrier layer having a graded porosity across the membrane. Fig. 10.1. Different membrane concepts incorporating an oxygen ion conductor (a) mixed conducting oxide, (b) solid electrolyte cell (oxygen pump), and (c) dual-phase membrane. Also shown is the schematics of an asymmetric porous membrane (d), consisting of a support, an intermediate and a barrier layer having a graded porosity across the membrane.
In agreement with the membrane concept, Heber (15) investigated a number of enzymes and found that none of the soluble ones were inactivated by freezing. The only one affected by freezing was the... [Pg.152]

Theoretical studies of a two-membrane system have been made by Tekic et al for the reaction A bB + cC. Membrane 1 passes B preferentially and membrane 2 passes C preferentially, so the two-membrane concept does work better for product separation than a single membrane. If the reactant is the slowest permeator, then process conversion is better with two membranes,... [Pg.82]

The first section of this chapter gives a brief survey of major membrane concepts and different membrane reactor configurations. Membrane materials are discussed in the second section. The third section will present the recent development of OITM reactors for selective oxidation of light alkanes. [Pg.53]

Kelly had almost forgotten her hair, cut to a fine fuzz to fit her armour suit s skull helmet. Style, dress sense, cosmetic membranes concepts which seemed to have dissolved clean out of her universe. "Well done, Garfield I can see why your observational ability pushed you right the way up the seniority league."... [Pg.246]

L.M. Moretto, P. Ugo, M. Zanata, P. Guerriero, and C.R. Martin, Nitrate biosensor based on the ultrathin-film composite membrane concept. Anal. Chem., 70(10), 2163-2166 (1998). [Pg.497]


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See also in sourсe #XX -- [ Pg.436 ]




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Major Membrane Concepts

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