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Einfluß von Stofftransport und Kinetik immobilisierter Lipasen in heterogenen Stoffsystemen auf Auslegung und Entwicklung von Enzymreaktoren

Influence of mass transfer and kinetics of immobilised lipases in heterogenous media on development and design of enzyme reactors
 
: Luck, T.

Düsseldorf: VDI-Verlag, 1989, 190 pp. : Abb.,Tab.
Zugl.: München, TU, Diss., 1989
Fortschritt-Berichte VDI, Reihe 3: Verfahrenstechnik
ISBN: 3-18-148803-8
German
Dissertation
Fraunhofer ILV ( IVV) ()
bioengineering; Bioverfahrenstechnik; Festbettdurchströmung; fixed-bed reactor; Glyceridanalytik; glyceride analysis; Kinetik; lipase; Lösungsmittelfreie Lipidiumesterung; mass transfer; Modellierung; modelling; process engineering; Prozeßauslegung; sovlent-free lipid-interesterification; Stofftransport

Abstract
The solvent-free interesterification of triglycerides with immobilized lipases was studied as a model system of an enzymcatalysed reaction in higher viscous media. An industrial-manufactured 1,3-specific lipase was used to examine engineering parameters for the development of a continuous process. Utilizing specially designed HPLC- and DSC-methods the kinetics of interesterification were determined as function of temperature (52-80 degree C), water content and diameter of the diocatalyst (5-10 % and 100-600 My m, respectively). The kinetics of interesterification can be described by a reversible first order reaction. The amount of one of the products, dimyristoylmonooleyl, passes through a temperature-dependent pseudo-equilibrium. Reaction velocity of hydrolysis (sidereaction of interesterification) is higher as reaction velocity of interesterification. Overall reaction velocity is influenced by internal mass transfer. Pressure drop in continuous interesterification in a fixed bed reac tor is acceptable if the temperature is higher than 60 degree C. External mass transfer and flow through the catalyst bed can be described by model equations.

: http://publica.fraunhofer.de/documents/PX-46094.html