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Improved process for 2,3,5-trimethylhydroquinone manufacture: highly efficient catalytic hydrogenation of 2,3,5-trimethylbenzoquinone

Improved process for 2,3,5-trimethylhydroquinone manufacture: highly efficient catalytic... An efficient and green process of catalytic hydrogenation of 2,3,5-trimethylbenzoquinone (TMBQ) to 2,3,5-trimethylhydroquinone (TMHQ) on Pd/C catalyst using the LBA (a commercial mixed solvent) as solvent is described. The important reaction parameters (e.g. temperature, catalyst loading, initial concentration of TMBQ, hydrogen pressure, and agitation speed) have been investigated to acquire the optimal process conditions. The hydrogenation molar yield of TMHQ by HPLC analysis is 99.4 %. The solvent could be recovered by steam distillation, while the isolated TMHQ overall molar yield reaches up to 96.7 %. The deactivation of Pd/C during the reuse of catalysts was ascribed to the depositions of TMHQ and TMBQ based on various characterizations and regeneration study of catalyst. The possible catalytic hydrogenation mechanism is also discussed. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Research on Chemical Intermediates Springer Journals

Improved process for 2,3,5-trimethylhydroquinone manufacture: highly efficient catalytic hydrogenation of 2,3,5-trimethylbenzoquinone

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References (10)

Publisher
Springer Journals
Copyright
Copyright © 2013 by Springer Science+Business Media Dordrecht
Subject
Chemistry; Catalysis; Physical Chemistry; Inorganic Chemistry
ISSN
0922-6168
eISSN
1568-5675
DOI
10.1007/s11164-013-1219-8
Publisher site
See Article on Publisher Site

Abstract

An efficient and green process of catalytic hydrogenation of 2,3,5-trimethylbenzoquinone (TMBQ) to 2,3,5-trimethylhydroquinone (TMHQ) on Pd/C catalyst using the LBA (a commercial mixed solvent) as solvent is described. The important reaction parameters (e.g. temperature, catalyst loading, initial concentration of TMBQ, hydrogen pressure, and agitation speed) have been investigated to acquire the optimal process conditions. The hydrogenation molar yield of TMHQ by HPLC analysis is 99.4 %. The solvent could be recovered by steam distillation, while the isolated TMHQ overall molar yield reaches up to 96.7 %. The deactivation of Pd/C during the reuse of catalysts was ascribed to the depositions of TMHQ and TMBQ based on various characterizations and regeneration study of catalyst. The possible catalytic hydrogenation mechanism is also discussed.

Journal

Research on Chemical Intermediates – Springer Journals

Published: May 1, 2013

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