Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Gas – vapor or mist contact
Patent
1995-06-09
1997-11-11
Alvo, Steven
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Gas, vapor or mist contact
162 77, 162 78, D21C 9153, D21C 916
Patent
active
056859538
ABSTRACT:
A bleached pulp having a high viscosity for a given permanganate number is formed by pretreating never dried pulp with an organic solvent medium to produce a treated pulp composed of said never dried pulp in the medium and then bleaching that treated pulp using ozone at a pH of 1.5-5 to provide a bleached pulp while reducing the viscosity loss during the ozone bleaching step significantly compared to that what would occur if the medium used in the ozone bleaching were water.
REFERENCES:
patent: 4229252 (1980-10-01), Meredith
patent: 4450044 (1984-05-01), Fritzvold et al.
"Effect of Cellulose Protectors on Ozone Bleaching of Kraft Pulp", Journal of the Japanese Technical Association of Pulp and Paper Industry, vol. 31, No. 9, Sep. 1977, pp. 62-70 by Hiroshi Kamishima, Toshiro Fujii, Isao Akamatsu.
"Ozone Bleaching of Kraft Pulps", S. Rothenberg and D. Johnsonbaugh, Empire State Paper Research Institute, State University College of Forestry at Syracuse Univ, Supplement to Research Paper No. 53 to State Paper Research Associates Inc, Apr. 12, 1971, pp. 13-18.
"Ozone Bleaching of Kraft Pulps", S. Rothenberg and D. Johnsonbaugh, Empire State Paper Research Institute, State University College of Forestry at Syracuse Univ, Research Paper No. 54 to Empire State Paper Research Associates Inc. Oct. 1, 1971, pp. 21-28.
Murphy Thomas Howard
Ni Yonghao
Solinas Marco
van Heiningen Adriaan Reinhard Pieter
Alvo Steven
MacMillan Bloedel Limited
Rowley C. A.
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