ISSN print edition: 0366-6352
ISSN electronic edition: 1336-9075
Registr. No.: MK SR 9/7
Displacement washing of pulp with urea solutions
F. Potůček and M. Pulcer
Department of Wood, Pulp, and Paper, Faculty of Chemical Technology, University of Pardubice, CZ-532 10 Pardubice, Czech Republic
Received: 3 March 2006 Revised: 11 April 2006 Accepted: 15 April 2006
Abstract: Two basic mechanisms of displacement washing of pulp fibres were investigated. Experiments were carried out in a laboratory washing cell that simulated a single stage of displacement washing. The step-change method has been employed in investigation of alkali lignin profile in outlet stream of washing effluents. The addition of urea to wash water resulted in a decrease of the liquid layer immobilized on the fibre surface. It had a positive effect on the washing efficiency expressed in terms of the void local efficiency.
Keywords: pulp - washing - mechanism - modelling - urea
Full paper is available at www.springerlink.com.
Chemical Papers 60 (5) 365–370 (2006)