Method for the bleaching of pulp in a D2D sequence wherein the e

Details Method for the bleaching of pulp in a D2D sequence wherein the e Method for the bleaching of pulp in a D2D sequence wherein the e

1998-04-13

2000-03-28

Alvo, Steven

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Gas, vapor or mist contact

162 67, 162 88, 162 89, D21C 914, D21C 9153

Patent

active

06042690&

ABSTRACT:
A process for bleaching cellulosic pulp to a G.E. brightness of at least about 75 and a viscosity of at least about 14 wherein the effluent from the bleaching process is of reduced colored matter content and exhibits reduced COD. The process comprises DZD stages without interstage treatment of the pulp other than by an optional water wash.

REFERENCES:
patent: 4080249 (1978-03-01), Kempf et al.
patent: 4216054 (1980-08-01), Bentvelzen et al.
patent: 4259149 (1981-03-01), Jaszka et al.
patent: 4372812 (1983-02-01), Phillips et al.
patent: 4959124 (1990-09-01), Tsai
Leibergott, N. and van Lierop, B.; "Oxidative Bleaching --A Review"; 69th Annual Meeting, Technical Section, Canadian Pulp and Paper Association; Preprints "A"; Feb. 1-2, 1983; pp. A169-183.
Gierer, Josef; "The Chemistry of Delignification, a General Concept"; Holzforschung, 1982, pp. 43-51.
Singh, Rudra P. (Edit); "The Bleaching Of Pulp, 3rd Edition, Revised"; 1979, TAPPI Press, Atlanta, GA; pp 382 & 383.

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