Abstract
The catalytic dimerization of castor fatty acids or their methyl esters by flow method was investigated. It is found that the synthetic silica-alumina composed of 70% SiO2 and 29% Al2O3 has high catalytic activity for the dimerization of castor fatty acid methyl esters and that the dimerization of castor fatty acids also easily proceeded over a phosphoric acid deposited on the silica-alumina support. Besides, it is observed that the dimerization process of ricinoleic acid, being main component of castor fatty acids, proceeded over the phosphoric acid catalyst and for its mechanism ricinoleic acid was dehydrated first and then octadecadienoic acid which was dehydrated products of ricinoleic acid, was dimerized.
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