MECHANISM AND KINETICS OF THE COCL2-CATALYZED ESTERIFICATION REACTION OF CASTOR-OIL WITH OLEIC-ACID


ERDEMSENATALAR A., ERENCEK E., ERCIYES A. T.

JOURNAL OF THE AMERICAN OIL CHEMISTS SOCIETY, vol.72, no.8, pp.891-894, 1995 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 72 Issue: 8
  • Publication Date: 1995
  • Doi Number: 10.1007/bf02542066
  • Title of Journal : JOURNAL OF THE AMERICAN OIL CHEMISTS SOCIETY
  • Page Numbers: pp.891-894

Abstract

The apparent orders of the Lewis acid-catalyzed esterification reactions between castor oil and oleic acid are known to change with the catalyst used and with the reaction temperature. A mechanism is proposed in this study to explain the variations (with temperature) in the apparent orders oi the cobalt chloride-catalyzed esterification reaction between castor oil and oleic acid. According to the proposed mechanism, an acid-catalyst intermediate forms in an initial, fast quasi-equilibrium step, and this intermediate then reacts with the oil to yield the products and to regenerate the catalyst in the rate-determining second step. A general rate expression, with an acid concentration term and a temperature-dependent constant in the denominator, is derived from the proposed mechanism and is verified with data obtained at different temperatures.