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    Item type:Publication, Access status: without files ,
    Original enzyme-catalyzed synthesis of chalcones: utilization of hydrolase promiscuity
    (Soc., 2016)
    Mitrev, Yavor N.
    ;
    Mehandzhiyski, Aleksander Y.
    ;
    Batovska, Daniela I.
    ;
    Liese, Andreas
    ;
    Galunsky, Boris
    An E-chalcone was obtained with very high stereoselectivity for the first time by an enzyme-catalyzed Claisen-Schmidt condensation between benzaldehyde and acetophenone. From a set of lipases, only that from hog pancreas demonstrated promiscuity, catalyzing the reaction in the presence of imidazole as a promoter. Another enzyme, acylase from Aspergillus melleus (EC 3.5.1.14) also proved to be active in the synthesis of E-chalcone under the same reaction conditions. This acylase along with the recombinant D-aminoacylase (EC 3.5.1.81) also catalyzed the reaction between acetophenone and p-nitrobenzaldehyde. Such a "green" approach to the synthesis of chalcones is of great interest because of the important applications of chalcones as formula ingredients in the pharmaceutical, food and cosmetic industries.
    Publicationtype: Journal Article
      149
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    Item type:Publication, Access status: without files ,
    An experimental study of the partial oxidation of ethane to ethylene in a shallow fluidized bed reactor
    (2007)
    Brzić, Danica
    ;
    Ahchieva, Desislava
    ;
    Peglow, Mirko
    ;
    Heinrich, Stefan
    The partial catalytic oxidation of ethane to ethylene was investigated experimentally in a shallow fluidized bed. The performaces of two catalyst types, pure γ-Al2O3 and V2O5/ γ-Al2O3 particles 1.8 mm in diameter, were analyzed. A pilot fluidized bed reactor with rectangular cross-section of 100 mm × 100 mm was used. The experiments were carried out under atmospheric pressure in a dilute system under oxygen excess conditions. V2O 5/γ-Al2O3 showed good catalytic performances regarding ethylene selectivity. The influence of the temperature (in the range of 400-600°C) and the contact time (in the range of 35 - 85 kg s m-3) on the conversion of ethane and the selectivity to ethylene was analyzed. The highest yield of ethylene was 18 %.
    Publicationtype: Journal Article
      9