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Synthesis, Characterization of Novel Hexamethyleneiminium-Based Ionic Liquids and their Application in Esterification

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Abstract:

Three novel Brønsted acidic ionic liquids (ILs), 1-(3-sulfopropyl) hexamethyleneiminium hydrogen sulfate ([HMIPS]HSO4), 1-(3-sulfopropyl) hexamethyleneiminium tosilate ([HMIPS]OTs) and 1-hexamethyleneiminium hydrogen sulfate([HMI]HSO4), were synthesized and characterized by 1H NMR, FT-IR and DSC-TG. Their catalytic activities for the esterification of citric acid with n-butanol were examined and compared with the imidazolium-based ILs. The results showed that the hexamethyleneiminium-based ILs exhibits excellent catalytic activity. By using [HMIPS]HSO4 as the catalyst, the yield of tributyl citrate reached 97.5%. Furthermore, the catalysts were reused at least 10 times without significant decrease in activity

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Periodical:

Advanced Materials Research (Volumes 233-235)

Pages:

155-159

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.233-235.155

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Online since:

May 2011

Authors:

Gong Li, Fei Ke Wu, Hui Juan Tong

Keywords:

Acidic Ionic Liquid, Catalysis, Esterification, Hexamethyleneimine, Tributyl Citrate

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© 2011 Trans Tech Publications Ltd. All Rights Reserved

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