D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
9/2, 8/78.1
D21C 9/10 (2006.01)
Patent
CA 1124015
ABSTRACT OF THE DISCLOSURE A method of treating cellulose material to produce oxygen bleached pulp without the need for all of the complicated equipment used in the production of oxygen bleached pulp by conventional methods. Cellulose material is continuously digested in a conventional di- gester to form pulp having a solids concentration of about 6 to 15 percent. The pulp is refined without significant dilution, and passed into the inlet of a conventional diffusion washer having one or more bleaching stages and a washing stage. The pulp is maintained at a pressure of about 50 to 150 psi in the diffusion washer, and the upwardly moving pulp being subjected to an oxygen agent in a bleaching stage by diffusion of the oxygen bleaching agent into the pulp. After passing through one or more such bleaching stages, the upwardly moving pulp is sub- jected to treatment with a washing liquid in the washing stage of the diffusion washer, and then the oxygen bleached washed pulp is expelled from the diffusion washer. Liquid withdrawn from the different stages of the diffusion washer is either recycled to the diffusion washer, or returned to the digester to serve as a wash liquid in the wash zone of the digester. Oxygen gas is introduced in the recycled withdrawn liquid, the liquid being saturated with the oxygen gas, before return of the liquid to the diffusion washer, the oxygen saturated liquid comprising the oxygen bleaching agent.
325828
Goudreau Gage & Associates
Kamyr Inc.
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