Centrifugal cleaning of pulp and paper process liquids

Details Centrifugal cleaning of pulp and paper process liquids Centrifugal cleaning of pulp and paper process liquids

1994-03-16

1995-11-21

Dawson, Robert A.

Liquid purification or separation

Processes

Separating

210806, 210928, 2103601, 209 72S, 494 43, 494 60, 494 80, B01D 2126

Patent

active

054683963

ABSTRACT:
A process for the removal of dispersed contaminants less dense than water from pulp and paper mill process liquids, comprises passing the liquid through a centrifuge and collecting the contaminants as a less dense fraction. The application of this invention to paper industry process liquids provides a means of removing a significant fraction of the wood resin and wood resin soaps from the process stream, thus enabling (1) a greater extent of reuse of filtrates and, hence, less effluents from mills, and (2) fewer problems from wood resin, such as deposit formation, loss of strength of product, and contamination of product with dirt particles.

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Steven Levis, Latest Developments in Lightweight Contaminant Removal, 1991, pp. 1057-1062.
Mutton, D. B., "Wood Extractives and their Significance to the Pulp and Paper Industries." Ch. 10, Wood Resins, Ed. W. E. Hillis, Academic Press, New York (1962).
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L. H. Allen, Pulp Paper Can. 76(5):70(1975) "Pitch in Wood Pulps".
G. M. Dorris, M. Douek and L. H. Allen, J. Pulp Paper Sci., 11(5): J149(1985) "Analysis of Amide Defoamers in Kraft Mill Pitch Deposits".
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