Journal ArticleDOI
Multiphase catalysis. II. Hollow fiber catalysts
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In this paper, a theory of diffusion control within hollow fiber catalysts is derived for three different types of coordinate geometries: Cartesian, cylindrical, and spherical, and effectiveness factors are calculated and formulas for reactant conversion in both a fixed-bed and a contimunuous-feed stirred-tank reactor are derived.Abstract:
A theory of diffusion control within hollow fiber catalysts is derived for three different types of coordinate geometries: Cartesian, cylindrical, and spherical. Effectiveness factors are calculated and formulas for reactant conversion in both a fixed-bed and a contimunuous-feed stirred-tank reactor are derived. The apparent Michaelis constant, Km′, is a measure of the amount of diffusion control within the catalysts. When Km′ is equal to Km, the true Michaelis constant, there is no diffusion control. In all other cases Km′ is greater than Km. Hollow fibers are attractive alternatives to spherical microcapsules for the encapsulation of enzymes.read more
Citations
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Journal ArticleDOI
The immobilization of whole cells: Engineering principles
TL;DR: Techniques which have been used to immobilize whole cells include adsorption, aggregation, confinement and entrapment, and many more have been proposed.
Book ChapterDOI
[29] Kinetic behavior of immobilized enzyme systems
TL;DR: This chapter discusses the kinetic behavior of immobilized enzyme systems, which can be controlled by both microenvironmental and mass-transfer effects.
Journal ArticleDOI
Enzyme Activity in Supercritical Fluids
TL;DR: Supercritical fluids are materials above their critical point that represent a unique class of nonaqueous media for biocatalysis and bioseparation as discussed by the authors, and the inherent gas-like low viscosities and high diffusi vities of supercritical fluids increase the rates of mass transfer of substrates to enzyme.
Journal ArticleDOI
Effect of internal diffusion in heterogeneous enzyme systems: evaluation of true kinetic parameters and substrate diffusivity.
Jean-Marc Engasser,Csaba Horváth +1 more
TL;DR: A graphical method is proposed to determine KM and Vmax‴ as well as the substrate diffusivity in the enzymic medium, since the conventional plots of enzyme kinetics do not yield straight lines under such conditions.
References
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Journal ArticleDOI
Handbook of Mathematical Functions
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.
Journal ArticleDOI
Semipermeable aqueous microcapsules. I. Preparation and properties.
TL;DR: Methods have been developed for depositing thin stable semipermeable polymer membranes around aqueous microdroplets (mean diameter down to 5 μ or less) by either interfacial polymerization or interfacial coacervation.
Journal Article
The chemical engineer
TL;DR: The place taken by the chemical engineer in modern industry and the production problems he must solve is discussed in this article, where the authors present a survey of the chemical engineering field and its history.
Journal ArticleDOI
The preparation and properties of ficin chemically attached to carboxymethylcellulose.
WE Hornby,Lilly,EM Crook +2 more
TL;DR: A shift of the alkaline limb of the pH-activity curve of ficin when chemically attached to CM-cellulose has been shown and these products are more resistant than free enzyme to heat denaturation.
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