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Molecules 2013, 18(7), 8168-8180; doi:10.3390/molecules18078168
Article

Preparation of a Sulfonated Carbonaceous Material from Lignosulfonate and Its Usefulness as an Esterification Catalyst

The Division of Bionanochemistry, the College of Natural Sciences, the Wonkwang University, Iksan City, Chonbuk 570-749, Korea
Received: 3 May 2013 / Revised: 26 June 2013 / Accepted: 8 July 2013 / Published: 10 July 2013
(This article belongs to the Section Organic Synthesis)
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Abstract

Sulfonated carbonaceous material useful as a solid acid catalyst was prepared from lignosulfonate, a waste of the paper-making industry sulfite pulping process, and characterized by 13C-NMR, FT-IR, TGA, SEM and elemental analysis, etc. The sulfonic acid group density and total density of all acid groups in the sulfonated carbonaceous material was determined by titration to be 1.24 mmol/g and 5.90 mmol/g, respectively. Its catalytic activity in the esterification of cyclohexanecarboxylic acid with anhydrous ethanol was shown to be comparable to that of the ionic exchange resin Amberlyst-15, when they were used in the same amount. In the meantime, the sulfonic acid group was found to be leached out by 26%–29% after it was exposed to hot water (95 °C) for 5 h. The catalytic usefulness of the prepared carbonaceous material was investigated by performing esterifications.
Keywords: sulfonated carbonaceous material; lignosulfonate; solid acid catalyst sulfonated carbonaceous material; lignosulfonate; solid acid catalyst
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Lee, D. Preparation of a Sulfonated Carbonaceous Material from Lignosulfonate and Its Usefulness as an Esterification Catalyst. Molecules 2013, 18, 8168-8180.

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