Rotating pulp bleaching reactor having inner and outer shells an

Details Rotating pulp bleaching reactor having inner and outer shells an Rotating pulp bleaching reactor having inner and outer shells an

1991-02-20

1992-02-11

Alvo, Steve

Paper making and fiber liberation

Apparatus

Digester

162246, 422209, D21C 702

Patent

active

050873261

ABSTRACT:
An apparatus for bleaching pulp particles comprising an inner tubular shaped shell member with lifter blades mounted on its internal wall surface. The shell member is rotatably mounted within an outer shell member with seals between the shell members providing an isolated space. This space is pressurized with a gas to prevent pulp particles and gases from escaping from the inner shell member by way of the seals.

REFERENCES:
patent: 1591070 (1926-07-01), Wolf
Allison, R. W., "Effect of Ozone on High-Temperature Thermomechanical Pulp", Appita, vol. 32, No. 4 (Jan. 1979) p. 279.
Allison, "Production of Bleached Softwood Pulp by Low Pollution Processes", Wood Sci. Technol. 17, pp. 129-137 (1983).
Carlberg et al., "Bleaching of Sulphite and Sulphate Pulps Using Conventional and Unconventional Sequences", TAPPI Proceedings 1982 Annual Meeting, p. 381.
Loras et al., "Bleaching of Sulphite Pulps With Oxygen and Ozone", Report of 1982 International Pulp Bleaching Conference, p. 45.
Mbachu et al., "The Effect of Acetic and Formic Acid Pretreatment on Pulp Bleaching With Ozone", TAPPI, vol. 64, No. 1 (Jan. 1981) p. 67.
Liebergott et al., "The Use of Ozone in Bleaching andd Brightening Wood Pulps: Part I-Chemical Pulps" (TAPPI 1978), p. 90
Lindquist, "Ozone Bleaching of Sulfite Pulps", Svensk Papperstidning (Nov. 6, 1984) p. 54.
Soteland, N., "Bleaching of Chemical Pulps with Oxygen and Ozone", Pulp and Paper Magazine of Canada, vol. 75, No. 4 (Apr., 1974) p. 91.
Rothenberg et al., "Ozone Bleaching of Oxygen Pulp", Proceedings of the 1982 Pulping Conference, p. 341.

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