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RSC Advances
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ARTICLE
Journal Name
Commun., 2014, 43, 188; (c)K. Y. NandDiwOaI:le10, .P10.3VS9ie./wNCA5iprRtihAcl2ae4dO3kn0ali5nrJe,
S. S. Deshpande and V. V. Bokade, J. Chem. Technol.
Biotechnol, 2014, 89, 1507.
Conclusions
In summary, the esterification of LA by using commercially
available metal salts as catalysts was studied. A highest ML
yield of 99.4% could be achieved over Al2(SO4)3 catalyst at
110oC for 10min. Comparison of two heating methods, namely
microwave and conventional heating, in the esterification
reaction indicated that microwave radiation could significantly
enhance the efficiency of the esterification of LA. Other
organic carboxylic acids were also successfully converted to
their esters with high yields. The esterification of LA aqueous
solution in methanol was achieved which provided a potential
solution to the esterification of carbohydrate hydrolyzate to
generate alkyl levulinates. At last, the catalyst can be easily
recycled and reused without much drop in the activity. The
current findings provide a new economically viable and
environmentally friendly system for the esterification of LA or
its aqueous solution to alkyl levulinates.
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Acknowledgements
DOI: 10.1039/C5GC01581B.
The authors are grateful for the financial support by National
Natural Science Foundation of China (NSFC 21502095), Natural
Science Foundation of Jiangsu Province (BK20150872) and the
Jiangsu Specially-Appointed Professor program of the State
Minister of Education of Jiangsu Province.
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