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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.Paper no. J10895 in JAOCS 82, 279-283 (April 2005).KEY WORDS: CTH, hydrogenation of castor oil, hydrogen donor, hydroxy stearic ester, keto stearic ester, palladium catalyst.

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