Selective hydrogenation of sunflower seed oil in a three-phase catalytic membrane reactor |
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Authors: | Jan W Veldsink |
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Affiliation: | (1) Agrotechnological Research Institute (ATO-DLO), P.O. Box 17, 6700 AA Wageningen, The Netherlands |
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Abstract: | Continuous hydrogenation of sunflower seed oil has been carried out in a novel three-phase catalytic membrane hydrogenation
reactor. The membrane reactor consisted of a membrane impregnated with Pd as the active catalyst, which provided a catalytic
interface between the gas phase (H2) and the oil. Hydrogenations were carried out at different pressures, temperatures, and selectivities, and the formation
of trans isomers was monitored during the hydrogenation runs. For the three-phase catalytic membrane reactor, interfacial transport
resistances and intraparticle diffusion limitations did not influence the hydrogenation reaction. Hydrogenation runs under
kinetically controlled conditions showed that oleic and elaidic acid were not hydrogenated in the presence of linoleic acid.
Initial formation of stearic acid was caused by direct conversion of linoleic acid into stearic acid by a shunt reaction.
Furthermore, high selectivities led to high trans levels, which is in accordance with the many published data on hydrogenation of vegetable oils in slurry reactors. Finally,
the catalytic membrane showed severe catalyst deactivation. Only partial recovery of the catalyst activity was possible. |
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Keywords: | Hydrogenation intraparticle diffusion palladium selectivity sunflower oil three-phase catalytic membrane reactor |
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