Heterogeneous catalysed esterification of propionic acid with n-amyl alcohol over a microporous cation-exchange resin dowex 50wx4


ERDEM B., Izei A.

Zeitschrift fur Physikalische Chemie, vol.224, no.5, pp.781-793, 2010 (Journal Indexed in SCI Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 224 Issue: 5
  • Publication Date: 2010
  • Doi Number: 10.1524/zpch.2010.5498
  • Title of Journal : Zeitschrift fur Physikalische Chemie
  • Page Numbers: pp.781-793

Abstract

Kinetics of heterogeneous catalysed esterification of propionic acid with n-amyl alcohol was studied with a microporous cation-exchange resin catalyst, Dowex 50Wx4, in a stirred batch reactor to synthesise amyl propionate. Effects of various parameters such as speed of agitation, catalyst loading, and reaction temperature on reaction rate were investigated. The equilibrium conversion of propionic acid increased with in catalyst loading and reaction temperature. Stirrer speed had virtually no effect on the reaction rate under the experimental conditions. The apparent activation energy was found to be 43.167 kJmolK1 for the formation of amyl propionate and the equilibrium constant, which is independent of temperature ranging from 318 to 348 K, was found to be 4.05. It was also observed that the initial reaction rate decreased with water concentrations and increased with that of acid and increased with that of alcohol linearly. The reaction was found to occur between an adsorbed acid molecule and a molecule of alcohol in the bulk and it was concluded that the reaction mechanism can be represented by Eley-Rideal model. © by Oldenbourg Wissenschaftsverlag, München.