Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Gas – vapor or mist contact
Patent
1992-02-20
1994-11-15
Jones, W. Gary
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Gas, vapor or mist contact
162 76, 162 80, 162 81, D21C 9153
Patent
active
053645030
ABSTRACT:
A method of bleaching a chemical pulp by adjusting the pH of the pulp to 1.5-3.5, chelating the pulp and then treating the pulp in an N stage with nitric oxide (NO) in the amount of at least 1.5% by weight of the oven dried pulp at a consistency of between 30 and 55% and further treating the pulp in a Z stage with ozone to produce a bleach pulp having a higher viscosity for a given permanganate number compared with a similar pulp bleached without using the N stage.
REFERENCES:
Patt et al., "Application of Nitrogen Dioxide & Ozone in the Pre Bleaching of Kraft & Sulfite Pulps", 1985 International Pulp Bleaching Conference, pp. 37-45 (Pattz).
Patt, R. & Welkener, U. "Bleaching of Baggasse Soda Pulp with Nitrogen Dioxide & Ozone", Holzforzchung, 39 (1985).
Rudra Singh, "Ozone replaces chlorine in the first bleaching stage", Tappi, Feb. 1982, vol. 65, No. 2, pp. 45-48.
Lachenal et al. "Improvement of Ozone Prebleaching of Kraft Pulps", J. Pulp & Paper Science, vol. 12, No. 2, Mar. 1986, J50-J53.
"Production of Bleached Chemical Pulp in the Future", Int. Pulp Bleaching Conf. 1991, Sweden, Jun. 11-14 1991, vol. 3.
"Achieving High Pulp Brightness & Good Pulp Strength Without Any Chlorine Bleaching Compounds," by Macas Tadas, Jiang & Becker
"Strength Characteristics of KP Bleached by Multistage Ozone Bleaching" by Kobayashi, T. et al., Japan TAPPI, 31(12), pp. 807-811, 1977.
Nitrogen (II) and Nitrogen (III) Compounds During Treatment of Kraft Pulp and Kraft Lignin with NO.sub.2, published in Nordic Pulp and Paper Research Journal No. 3, 1988, pp. 138-144 by Dennis Rasmussen and Olof Samuelson.
Optimization of Bleaching Sequences using Peroxide as a First Stage, 1982 International Pulp Bleaching Conference, B. Lachenal et al.
Improvement of Ozone Pre-Bleaching of Kraft Pulps, International Pulp Bleaching Conference, 1985, Lachenal et al.
Murphy Thomas H.
Solinas Marco
Jones W. Gary
MacMillan Bloedel Limited
Nguyen Dean T.
Rowley C. A.
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