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Esterification by solid acid catalysts - A comparison
Balasubramanian Viswanathan, Thirukkallam Kanthadai Varadarajan
Published in
2004
Volume: 223
   
Issue: 1-2
Pages: 143 - 147
Abstract
The esterification of triethylene glycol (TEG) with methacrylic acid (MAA) was carried out over various solid acid catalysts and the results were compared with conventional acid catalysts. Among the catalysts studied, heteropolyacids showed higher activities than the conventional acids. These were attributed to the acidity of the catalysts. A systematic investigation was carried out for the esterification of triethylene glycol with methacrylic acid over phosphotungstic acid without any free radical inhibitor. The effects of catalyst concentration, alcohol/acid molar ratio and temperature were also studied. Parameters such as activation energy, reaction enthalpy and reaction entropy were derived for the above reaction over phosphotungstic acid in the temperature range of 353-383 K. The obtained results were also compared with silicotungstic acid. The esterification of triethylene glycol (TEG) with methacrylic acid (MAA) was carried out over various solid acid catalysts and the results are compared with that of conventional acid catalysts. Among the catalysts studied, heteropolyacids showed higher activities than the conventional acids. Parameters such as activation energy, reaction enthalpy and reaction entropy were derived for this reaction over phosphotungstic acid in the temperature range of 353-383 K. © 2004 Elsevier B.V. All rights reserved.
About the journal
JournalJournal of Molecular Catalysis A: Chemical
ISSN13811169
Open AccessNo
Concepts (26)
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    HETEROPOLYACIDS
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    Methacrylic acid
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    TRIETHYLENE GLYCOL
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    Activation energy
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    Esterification
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    Free radicals
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    Organic acids
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    Polyethylene glycols
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    Thermal effects
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    CATALYSTS
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    Alcohol
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    Free radical
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    PHOSPHOTUNGSTIC ACID
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    Silicon derivative
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    TRIETHYLENE GLYCOL
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    Acidity
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    Catalysis
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    Catalyst
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    Chemical reaction
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    Chemical reaction kinetics
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    Conference paper
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    Energy transfer
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    Enthalpy
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    Entropy
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    Reaction analysis
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    Temperature dependence