Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Treatment with particular chemical
Patent
1992-03-09
1995-01-31
Jones, W. Gary
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Treatment with particular chemical
162 65, 162 78, 162 81, D21C 320
Patent
active
053856414
ABSTRACT:
In a three-stage process for the delignification of cellulose-containing raw materials, pulping is initially performed with a solution of concentrated aqueous acetic acid at an elevated temperature and under an elevated pressure. The resultant acetic acid-moist pulp is treated in a second stage with the aforementioned pulping solution with the addition of nitric acid and is then washed or extracted with water or with the pulping solution. In a third treatment stage, the thus-obtained acetic acid-moist pulp is treated with an ozone-containing gas.
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Patt, R., "Application of Nitrogen Dioxide and Ozone in the Pre-Bleaching of Kraft & Sulfite Pulps", 1985 Int'l Pulp Bleaching Conference, pp. 37-44.
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Balle Stefan
Berg Alex
Janssen Wim
Klein Wolfdieter
Kunz, deceased Rudolf G.
Acetocell GmbH & Co. KG
Jones W. Gary
Nguyen Dean T.
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