Properties of microcrystalline cellulose extracted from soybean hulls by reactive extrusion

Abstract

The objectives of this study were to produce microcrystalline cellulose (MCC) from soybean hulls (SH) employing a simple method based on reactive extrusion , and to characterize the product according its microstructure, morphology, crystallinity and thermal stability . MCC was obtained from SH after a two-step extrusion process ; in the first step, the SH was extruded with sodium hydroxide (NaOH), followed by extrusion with sulfuric acid (H 2 SO 4 ) in the second step. The MCC produced from SH by reactive extrusion was composed of short and rod shaped fibers, with a cellulose content of 83.79% and a crystallinity index of 70%. Reactive extrusion is an alternative and effective method for the production of MCC from lignocellulosic residues, and has the advantages of simplicity and was less polluting than conventional methods.