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Ethanolysis of rapeseed oil by KOH as homogeneous and as heterogeneous catalyst supported on alumina and CaO
Authors: Hájek Martin | Skopal František | Čapek Libor | Černoch Michal | Kutálek Petr
Year: 2012
Type of publication: článek v odborném periodiku
Name of source: Energy
Publisher name: Pergamon-Elsevier Science Ltd.
Place: Oxford
Page from-to: 392-397
Titles:
Language Name Abstract Keywords
cze Etanolýza řepkového oleje pomocí homogenního a heterogenního katalyzátoru Byla studována alkalicky katalyzovaná etanolýza řepkového oleje. V případě homogenní katalýzy, byl studován vliv různých reakčních podmínek (teplota a čas reakce, množství katalyzátoru, molární poměr etanol k oleji, atd.) na kvalitu a kvantitu bionafty (výtěžek, čistota, číslo kyselosti atd.) a glycerolové fáze (hmotnost, množství mýdel a ethylesterů). Data byla vyhodnocena lineární regresí. Získané modely byly verifikovány nezávislými experimenty a jsou schopny predikovat kvalitu i kvantitu bionafty na základě reakčních podmínek. Byla provedena také faktorová analýza výsledků. V případě heterogenních katalyzátorů bylo zjištěno, že voda v reakční směsi způsobuje únik aktivní komponenty vznikem mýdel. bionafta; etyl ester; transesterifikace; homogenní katalýza; heterogenní katalýza
eng Ethanolysis of rapeseed oil by KOH as homogeneous and as heterogeneous catalyst supported on alumina and CaO The alkaline-catalyzed ethanolysis of rapeseed oil was studied. In the case of homogeneous catalysis (KOH), the effects of various reaction conditions on the quantity and quality of biodiesel (yield, purity, acid number, carbon residue, free glycerol, potassium content) and the glycerol phase (weight, soaps and ethyl esters content) were studied. The studied reaction conditions were: the reaction temperature and time, the catalyst concentration, the molar ratio of ethanol to oil, the revolutions of stirring, the temperature and time of deethanolisation and the initial temperature of the separation. Data was evaluated by linear regression on the statistical basis of multivariable systems. The final linear models were verified by independent experiments and they are able to predict the biodiesel quantity and quality in the range of the reaction conditions. Finally, the factor analysis of the ester phase variables was carried out. Moreover, ethanolysis was catalyzed by a heterogeneous catalytic system; attention was focused not only on catalyst activity but also on catalyst stability, which was determined by potassium leaching. Biodiesel; Ethyl esters; Transesterification; Homogeneous catalyst; Heterogeneous catalyst

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