Thermal alteration of oleic acid in the presence of clay catalysts with co-catalysts.

Autor: Nakano, Y., Foglia, T., Kohashi, H., Perlstein, T., Serota, S.
Zdroj: Journal of the American Oil Chemists' Society (JAOCS); May1985, Vol. 62 Issue 5, p888-891, 4p
Abstrakt: The effects of added co-catalysts on the clay catalyzed polymerization of oleic acid have been investigated. Heating oleic acid at 230 C for 3 hr with a clay catalyst gave a polymer fraction (dimer and trimer acids, 35% yield) and a monomer fraction (branched chain isomers of oleic acid, 27% yield) as the major products. The variation in yield between the polymer and monomer products was found to be dependent upon the co-catalyst used with the clay catalyst. For example, with both acidic and basic clays, polymer formation is favored (55% yield) in the presence of water and/or metal ions. In contrast, when Bronsted acids such as methanesulfonic or phosphoric acid are used as co-catalysts, the yield of branched monomer increased significantly (50%). Studies on the adsorption of oleic and Bronsted acids onto the clay surface showed that isomer formation is favored when both the oleic acid and the Bronsted acids are adsorbed onto the clay surface at selected molar ratios. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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