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Publication detail

Transesterification of rapeseed oil by butanol and separation of butyl ester
Authors: Hájek Martin | Skopal František | Vávra Aleš | Kocík Jaroslav
Year: 2017
Type of publication: článek v odborném periodiku
Name of source: Journal of Cleaner Production
Publisher name: Elsevier Science
Place: Oxford
Page from-to: 28-33
Titles:
Language Name Abstract Keywords
cze Transesterifikace řepkového oleje pomocí butanolu a separace butyl esteru Článek popisuje reakce a separační podmínky pro transesterifikaci řepkového oleje pomocí butanolu za pomoci KOH jako katalyzátoru. Produktem je směs butyl esterů vyšších mastných kyselin, která může být použita jako bionafta pro spalovací motory. Byl studován vliv vybraných reakčních podmínek na proces butanolýzy. bionafta; transesterifikace; butanol; separace; butyl ester
eng Transesterification of rapeseed oil by butanol and separation of butyl ester The paper describes the reactions and separations conditions for the transesterification of rapeseed oil by butanol under potassium hydroxide as a catalyst. The product is a mixture of butyl esters of higher fatty acids, which can be used as fuel (biodiesel) for combustion engines. The effect of the chosen reaction conditions (independent variables: the reaction temperature and time, the amount of catalyst, the molar ratio of butanol to oil and the method of oil addition to butanol) on the butanolysis process was studied. The measured data was analysed by multi-linear regression and the statistical models describe the dependency of glycerides (dependent variables) on the independent variables. The transesterification was stopped by neutralization of the catalyst with both a strong and weak acid been added to whole reaction mixture. The advantage of strong acid is a very fast separation and a zero content of potassium and free glycerol, nevertheless a high acid number (1.7-4.5 mg kg(-1)). In the case of weak acid (gas carbon dioxide), the acid number is less than 0.5 mg kg(-1), but the separation takes longer. Moreover, the separation was sped up by the addition of a small amount of water to the reaction mixture after the reaction and removal of butanol. This way also decreased the content of potassium (10 times) and free glycerol (4 times) in the ester phase compare to the separation without water. Moreover, the relationship between the flashpoint and the content of butanol in butyl ester was described, which enables the determination only the butanol content and the calculation of the flashpoint or vice-versa. Biodiesel; Transesterification; Butanol; Separation; Butyl ester

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