Sulfonic acid functionalized poly(ethylene glycol dimethacrylate-1-vinyl-1, 2,4-triazole) as a high-performance solid acid catalyst for the esterification of lactic acid with methanol


ERDEM B., KARA A.

JOURNAL OF COLLOID AND INTERFACE SCIENCE, vol.367, pp.394-397, 2012 (SCI-Expanded) identifier identifier identifier

Abstract

Sulfonic acid functionalized poly(ethylene glycol dimethacrylate-1-vinyl-1,2,4-triazole), poly(EGDMA-VTAZ-SO3H), is evaluated in the esterification of lactic acid with methanol. From nitrogen physisorption data, high surface area (220 m(2)/g) and type IV isotherm are obtained. Conversion measurements indicate a stronger interaction of poly(EGDMA-VTAZ-20%SO3H) with water molecules than that occurring in poly(EGDMA-VTAZ-10%SO3H). Hence, the higher catalytic activity of poly(EGDMA-VTAZ-10%SO3H) is related to the more hydrophobic microenvironment of - SO3H sites, which reduces the acid site deactivation associated with adsorption of water generated during the reaction. Moreover, apparent activation energy is found to be 48.02 kJ mol(-1), which can be comparable with the literature values. (C) 2011 Elsevier Inc. All rights reserved.