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Properties of microcrystalline cellulose extracted from soybean hulls by reactive extrusion
The objectives of this study were to producemicrocrystalline cellulose(MCC) fromsoybean 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
(H2SO4) 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 effectivemethod for the production ofMCC from lignocellulosic residues, and has the advantages
of simplicity and was less polluting than conventional methods.

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