Kinetic investigation of sorbitol and xylitol dehydration catalyzed by silicotungstic acid in water

Authors: Jens Uwe Oltmanns, Stefan Palkovits, Regina Palkovits

Abstract:
Sorbitol and xylitol dehydration reactions have been investigated regarding their kinetic properties. The reactions were catalyzed by silicotungstic acid in water under hydrogen pressure attemperatures ranging from 160^◦C to 200^◦C. The products have been measured by HPLC at regular intervals and reaction models have been developed based on these results. Modeling of the experimental data has been done with Presto-Kinetics^® and the resulting reaction rates have been used to determine activation energies of all involved reaction steps. By this way, a set of four activation energies was obtained for the dehydration of sorbitol to its products, including 1,4-sorbitan and isosorbide. The activation energy for the dehydration of xylitol to 1,4-anhydroxylitol could also be obtained.

Keywords:
Sorbitol
Xylitol
Dehydration
Kinetic investigation
Activation energy

Published in: Applied catalysis A: General  (Volume 456, Pages 1-248, 10 April 2013)

Publisher: Elsevier

ISSN Information: 0926-860X

Kinetic investigation of sorbitol and xylitol dehydration catalyzed by silicotungstic acid in water

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