Preparation of cationic starches by reactive extrusion : experiments and modelling
Résumé
Starch is one of the most common polysaccharides from natural and renewable resources. It is increasingly used in place of synthetic polymers for industrial applications and can be chemically modified to obtain products having specific properties. For example, cationic starches are largely used in the paper industry. They are generally prepared using conventional batch reactors, but they can also be obtained using reactive extrusion. In this chapter, after a brief introduction to the twin-screw reactive extrusion process, experimental results of starch cationization are presented. Then, a model based on flow simulation coupled to a kinetic equation is developed, allowing a clear understanding of the influence of the processing parameters on the extent of the cationization reaction. This model, experimentally validated, is then used to solve optimization and scale-up problems.
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