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    Wyświetlanie 1-3 z 3
    Tytuł:
    Optimal feed temperature for an immobilized enzyme fixed-bed reactor: a case study on hydrogen peroxide decomposition by commercial catalase
    Autorzy:
    Grubecki, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/185291.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    optimal feed temperature
    maximum hydrogen peroxide conversion
    parallel deactivation
    immobilized commercial catalase
    diffusional resistances
    fixed-bed reactor
    optymalna temperatura zasilania
    maksymalna konwersja nadtlenku wodoru
    dezaktywacja równoległa
    unieruchomiona komercyjna katalaza
    opory dyfuzyjne
    reaktor z nieruchomym złożem
    Opis:
    Optimal feed temperature was determined for a non-isothermal fixed-bed reactor performing hydrogen peroxide decomposition by immobilized Terminox Ultra catalase. This feed temperature was obtained by maximizing the average substrate conversion under constant feed flow rate and temperature constraints. In calculations, convection-diffusion-reaction immobilized enzyme fixed-bed reactor described by a set of partial differential equations was taken into account. It was based on kinetic, hydrodynamic and mass transfer parameters previously obtained in the process of H2O2 decomposition. The simulation showed the optimal feed temperature to be strongly dependent on hydrogen peroxide concentration, feed flow rate and diffusional resistances expressed by biocatalyst effectiveness factor.
    Źródło:
    Chemical and Process Engineering; 2018, 39, 1; 39--57
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimal feed temperature for hydrogen peroxide decomposition process occurring in a bioreactor with fixed-bed of commercial catalase: a case study on thermal deactivation of the enzyme
    Autorzy:
    Grubecki, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/185125.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    fixed-bed (bio)reactor
    hydrogen peroxide decomposition
    optimal feed temperature
    hydrogen
    peroxide conversion
    parallel and thermal enzyme deactivation
    diffusional resistances
    reaktor z nieruchomym złożem
    optymalna temperatura zasilania
    wodór
    konwersja nadtlenku
    opory dyfuzyjne
    Opis:
    On the basis of hydrogen peroxide decomposition process occurring in the bioreactor with fixed-bed of commercial catalase the optimal feed temperature was determined. This feed temperature was obtained by maximizing the time-average substrate conversion under constant feed flow rate and temperature constraints. In calculations, convection-diffusion-reaction immobilized enzyme fixed-bed bioreactor described by a coupled mass and energy balances as well as general kinetic equation for rate of enzyme deactivation was taken into consideration. This model is based on kinetic, hydrodynamic and mass-transfer parameters estimated in earlier work. The simulation showed that in the biotransformation with thermal deactivation of catalase optimal feed temperature is only affected by kinetic parameters for enzyme deactivation and decreases with increasing value of activation energy for deactivation. When catalase undergoes parallel deactivation the optimal feed temperature is strongly dependent on hydrogen peroxide feed concentration, feed flow rate and diffusional resistances expressed by biocatalyst effectiveness factor. It has been shown that the more significant diffusional resistances and the higher hydrogen peroxide conversions, the higher the optimal feed temperature is expected.
    Źródło:
    Chemical and Process Engineering; 2018, 39, 4; 491--501
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Prediction of the fixed-bed reactor behavior for biotransformation with parallel enzyme deactivation using dispersion model: A case study on hydrogen peroxide decomposition by commercial catalase
    Autorzy:
    Grubecki, Ireneusz
    Kazimierska-Drobny, Katarzyna
    Powiązania:
    https://bibliotekanauki.pl/articles/777969.pdf
    Data publikacji:
    2019
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    Hydrogen peroxide decomposition
    Fixed-bed rector
    Parallel deactivation
    Terminox Ultra catalase
    Diffusional resistances
    Average conversion
    Opis:
    The problems of process costs and pollution of residual waters in the textile industry require increasing attention due to the new ecological regulations and also those resulting from an economic point of view. Hence, the behavior of non-isothermal fixed-bed reactor applied for hydrogen peroxide decomposition by immobilized Terminox Ultra catalase attached onto the outer surface of glass beads was studied to determine the operational conditions at which hydrogen peroxide decomposition is most effectively. A dispersion model for bioreactor applied in this work, and verified experimentally, took into account the coupled mass and heat balances as well as the rate equation for parallel enzyme deactivation. The effect of feed temperature, feed flow rate, feed hydrogen peroxide concentration, and diffusional resistances were analysed. In the calculations the global effectiveness factor based on the external mass-transfer model developed previously was employed to properly predict the real bioreactor behavior.
    Źródło:
    Polish Journal of Chemical Technology; 2019, 21, 4; 106-115
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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