VSE knjižnice (vzajemna bibliografsko-kataložna baza podatkov COBIB.SI)
  • Exploiting the pressure effect on lipase-catalysed wax ester synthesis in dense carbon dioxiode
    Knez, Željko ...
    The present work focuses on the thermodynamic interpretation of the lauryl oleate biosynthesis in high-pressure carbon dioxide. Lipase-catalyzed lauryl oleate production by oleic acid esterification ... with 1-dodecanol over immobilized lipase from Rhizomucor miehei (Lipozyme RM IM) was successfully performed in a sapphire window batch stirred tank reactor (BSTR) using dense CO2 as reaction medium. The experiments were planned to elucidate the pressureeffect on the reaction performance. With increasing the pressure up to10 MPa, the catalytic efficiency of the studied enzyme improved rising up toa maximum and decreased at higher pressure values. Kinetic observations, exhibiting that dense CO2 expanded reaction mixture in subcritical conditions led to higher performance than when diluted in a single supercritical phase, were elucidated by phase-equilibrium arguments. The experimental results were justified with emphasis on thermodynamic interpretation of the studied system.Particularly, the different reaction performances obtained were relatedto the position of the operating point with respect to the location of liquid-vapor phase boundaries of the reactant fatty acid/alcohol/CO2 ternary system. The outlook for exploitation of CO2 expanded phase at lower pressure compared to supercritical phase, with heterogeneous system in which the solid catalyst particles are exposed to dense CO2 expanded reaction mixture, in developing new biotransformation schemes is promising.
    Vir: Biotechnology and bioengineering. - ISSN 0006-3592 (Vol. 97, No. 6, 15 Aug. 2007, str. 1366-1375)
    Vrsta gradiva - članek, sestavni del
    Leto - 2007
    Jezik - angleški
    COBISS.SI-ID - 11588374

    Povezava(-e):

    http://dx.doi.org/10.1002/bit.21331

vir: Biotechnology and bioengineering. - ISSN 0006-3592 (Vol. 97, No. 6, 15 Aug. 2007, str. 1366-1375)
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