Medium consistency pulp ozone bleaching

Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Charging and/or discharging fibrous material

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162 57, 162 65, D21C 9153

Patent

active

054116333

ABSTRACT:
Medium consistency (e.g. about 6-15%) paper pulp is effectively bleached with ozone in a carrier gas (typically oxygen) by effecting efficient separation of carrier gas from the pulp after reaction with the ozone, and introducing the ozone into the pulp at a pressure of about 10-13 bar. Ozone in oxygen and medium consistency paper pulp are fed to a fluidizing mixer; the intimate uniform mixture produced is then passed upwardly in a reaction vessel until about 99% of the ozone has been consumed, and then separation of gas from the pulp is initiated by moving the pulp mixture into a generally horizontal tube leading to a gas zone in a large diameter retention vessel. A pressurized gas pad is maintained at and above the introduction of the pulp into the retention vessel, while the level of pulp in the retention vessel is maintained below the point of introduction. The pulp may be withdrawn from the retention vessel with a fluidizing degassing pump, and the pressurized gas removed from the top of the vessel may be fed to an apparatus using oxygen gas under pressure.

REFERENCES:
patent: 4486286 (1984-08-01), Johnson
Das Papier, Sinotex.RTM., "Medium Consistency Ozone Bleaching: Laboratory and Mill Experience", Sixta et al; Oct., 1991 No. 10, pp. 610-625.
"Ozone Bleaching: Medium Consistency Technology and Mill Experience" Sixta et al; pp. 1-13, 2 dwg Figures (Admitted Prior Art).
"MC.RTM. Ozone Bleaching; Kamyr AB/Lenzing Pilot System" Drawing-(Admitted Prior Art).
"Medium Consistency Ozone Bleaching", Laxen et al; pp. 1-10, 5 dwgs Figures (Admitted Prior Art).

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