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Wyszukujesz frazę "diffusional resistances" wg kryterium: Temat


Wyświetlanie 1-3 z 3
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
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:
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
    Wyświetlanie 1-3 z 3

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