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Preparation of Methyl Ester by Heterogeneous Catalysed Esterification and Transesterification
Authors: Hájek Martin | Kocík Jaroslav | Smoláková Lucie | Kutálek Petr | Čapek Libor
Year: 2014
Type of publication: článek ve sborníku
Name of source: SDEWES: THE 8TH CONFERENCE ON SUSTAINABLE DEVELOPMENT OF ENERGY, WATER AND ENVIRONMENT SYSTEMS
Publisher name: AIDIC SERVIZI SRL
Place: MILANO
Page from-to: 79-84
Titles:
Language Name Abstract Keywords
cze příprava metylesteru pomocí heterogenní katalyzované esterifikace a transesterifikace Cílem této práce je studovat dva typy katalyzátorů - kyselých a bazických pro přípravu metylesteru. Prvním cílem je popsat transesterifikaci katalyzovanou pomocí směsných oxidů Mg-Al v širokém rozsahu Mg/Al poměru včetně vztahu mezi hodnotami pomocí statické analýzy a katalytické stability. transesterifikace; katalyzátory; směsné oxidy; hydrotalcity
eng Preparation of Methyl Ester by Heterogeneous Catalysed Esterification and Transesterification The aim of this work is to study and test two types of catalyst - acid and basic for the preparation of methyl esters. The first goal is to describe the transesterification catalysed by Mg-Al mixed oxides in a broad range of Mg/Al ratio (from 1.0 to 8.4) including the relation between the variables by statistical analysis and catalyst stability. The mixed oxides with a different Mg/Al molar ratio were synthesized by thermal pretreatment of hydrotalcite at 450 degrees C. The influence of the Mg/Al molar ratio on the yield of ester, leaching of magnesium and catalyst properties such as the concentration of basic sites, crystallite size of MgO and specific surface area were studied. It was found that the crystallite size and the yield of ester increases and the concentration of basic sites decreases with an increasing Mg/Al molar ratio; the specific surface area does not depend on the Mg/Al molar ratio. The relation between the variables was described by statistical analysis (the correlation matrix and principal component analysis). There was observed only negligible magnesium leaching from solid Mg/Al mixed oxides to the liquid phases. Five types of zeolites (MOR-C and D, ZSM-5, Y and mesoporous BEA) were tested in the esterification of oleic acid and the results were compared with pure alumina. The highest yield exhibited mesoporous BEA. The comparison of catalytic and non-catalytic esterification was carried out at the same reaction conditions. transesterification; catalysts; mixed oxides; hydrotalcites

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