Journal of Oil Palm Research Vol. 10 No. 1  1998 June p.  1-14

Hydroxystearic compounds from unsaturated palm fatty acid

Author(s): RAKMI, A R*; SUPRIYADI, S**

Initial studies on hydroxylation of unsaturated palm fatty acids were carried out with very promising results. Hydroxylation of unsaturated palm fatty acids with hydrogen peroxide-acetic acid for two hours gave products with melting points of 79°C – 128°C, acid values of 135-165, saponifiable values of 119-128 and hydroxyl values of 384-440. Yield of the product was about 80% – 90%. The product characteristics were very different from those obtained from other oils. For example, hydroxy fatty acid from sunflower oil has a saponifiable value of 212, acid value of 140 and hydroxyl value of 222 (Dahlke et al., 1995).

The product obtained in this study was not only 9,10-dihydroxystearic acid but also some fatty acids and 10-oxo-stearic acid. By adding hydroxystearic acid at a concentration of 0.2%, the life of steel was extended by up to 10 times, showing that hydroxystearic acid was very effective as a rust inhibitor. Therefore, hydroxylation of unsaturated palm fatty acid is a promissing process for obtaining hydroxystearic compounds.

Keywords: , ,

Author Information
* Department of Chemical and Process Engineering, Faculty of Engineering, Universiti Kebangsaan Malaysia, 43600 UKN Bangi, Selangor, Malaysia

** Indonesian Oil Palm Research Institute (IOPRI), O.O Box 1103, Medan 20001, Indonesia.

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