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Castor oil hydrogenation by a catalytic hydrogen transfer system using limonene as hydrogen donor
Author(s) -
Martinelli Márcia,
Schneider Rosana de Cassia de Souza,
Baldissarelli Vanessa Za,
von Holleben Maria Luiza,
Caramao Elina Bastos
Publication year - 2005
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/s11746-005-1067-4
Subject(s) - limonene , catalysis , castor oil , chemistry , dehydrogenation , hydrogen , organic chemistry , solvent , chromatography , essential oil
The hydrogenation of castor oil was investigated using a catalytic transfer hydrogenation system in which palladium on carbon was the catalyst and limonene was the solvent and hydrogen donor. The highest percentage of castor oil modification occurred at 178°C using 1% Pd/C and an oil/limonene ratio of 1∶3. The optimized system presented very good reproducibility and 100% conversion of the ricinoleate. GC using a mass spectrometer as detector and 1 H NMR spectra of the products indicated that hydrogenation was accompanied by dehydrogenation leading to a mixture of 12‐hydroxy and 12‐keto stearic derivatives.