acidic ionic liquids: pyridinium hydrogen sulfate ([H– + − Pyr] [HSO ] ), pyridinium dihydrogen phosphate ([H– + − + − Pyr] [H PO ] ) and pyridinium nitrate ([H–Pyr] [NO ] ) 2 4 3 in the esterification of acetic acid with n-butanol was com- pared in the current paper. The alteration in the values of acetic acid conversion and esterification rate were inves- tigated as a function of the process parameters: catalyst nature, catalyst loading, initial molar ratio n-butanol:acetic acid and reaction temperature. The anion variety modi- fied the acidity of the obtained samples and effected + − their catalytic activity as follows: [H–Pyr] [NO ] < [H– + − + − Pyr] [H PO ] < [H–Pyr] [HSO ] . The increasing of both 2 4 4 Keywords Pyridinium · Ionic liquid · Brønsted acidity · catalyst loading and reaction temperature led to higher val- Batch esterification · n-Butyl acetate ues of acetic acid conversion and esterification rate. The existence of a positive linear relationship between the ester- ification rate and acetic acid concentration was observed. 1 Introduction The increasing of the n-butanol concentration negatively affected the rate of esterification. The acetic acid conver - Esterification of carboxylic acids is
Catalysis Letters – Springer Journals
Published: Jul 6, 2017
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