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Abstract
Delignification of wheat straw with aqueous ethanol in the presence of alkaline catalyst has been studied. The use of 60% (v/v) ethanol under alkaline condition (0.5 N NaOH) resulted in increased rate of delignification by 7.1% as compared with the treatment of wheat straw in 0.5 N NaOH medium without ethanol. The chemical composition of the lignin fraction isolated by two steps of precipitation are reported. The characteristics of the lignin were further investigated by gel permeation chromatography (GPC), infrared (IR) and 13C-nuclear magnetic resonance (NMR) spectroscopy.