Application of parallel test reactions to study micromixing in a co-rotating twin-screw extruder
Antoni Rożeń , R. A. Bakker , Jerzy Robert Bałdyga
AbstractThe co-rotating twin-screw extruder (CoTSE) is widely applied in the polymer industry for continuous processing of very viscous materials. Melting, addition of side streams of catalysts or fillers, mixing, complex reactions of polymer synthesis or modification, removal of volatiles and extrusion of the final product can all be performed in a single CoTSE. Each unit operation takes place in a separate section of the extruder; the mean residence time in each section is short and the extruder has to perform these operations efficiently. Fulfilling these conditions is especially important when mixing is followed by fast or very fast chemical reactions of non-linear kinetics proceeding between the mixed reactants (mixing of a catalyst or an initiator with monomers of polymers). This chapter describes the mechanism of laminar mixing of Newtonian and completely miscible liquids experimentally, in a co-rotating twin-screw extruder by means of parallel test reactions. The side stream of the concentrated solution of base (limiting reactant) is mixed with the main stream of the diluted pre-mixture of acid and ester. A neutral thickening agent is applied to alter the viscosity of both solutions. The selectivity of the test reactions being related to the course of micromixing is affected by operating conditions, the screw geometry and differences in viscosities of the mixed liquids. An explanation of the observed phenomena is proposed in the end.
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|Book||Van Den Akker H.E.A, Derksen J.J. (eds.): Proceedings of 10th European Conference on Mixing, 2000, Amsterdam 1043 NX, Netherlands, Elsevier Science B.V. , ISBN 9780444504760, [9780080525792, 0-444-50476-1], 572 p.|
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