Appeal No. 1998-2354
Application 08/054,588
1. A method for transporting pulp from an initial
gaseous bleaching stage to subsequent bleaching stages,
comprising the steps of:
supplying a medium consistency pulp to a pulp contactor
apparatus included in the initial gaseous bleaching stage
which comprises an ozone bleaching stage;
delivering to the pulp contactor apparatus a gaseous
bleaching reagent at a predetermined pressure;
maintaining the pressure of the gaseous bleaching reagent
within the pulp contactor apparatus;
discharging the medium consistency pulp from the pulp
contactor apparatus under said gas pressure;
using the gas pressure maintained by the pulp contactor
apparatus as the motive force to transport the medium
consistency pulp and the gaseous bleaching reagent to at least
an immediately subsequent bleaching stage;
disposing a mixer between the initial gaseous bleaching
stage and the immediately subsequently bleaching stage; and
releasing a portion of the gas pressure from said mixer
to reduce the quantity of the gaseous bleaching reagent
carried forward to the immediately subsequent bleaching stage.
THE REFERENCES
Edlund et al. (Edlund) 5,116,475 May 26,
1992 Tsai 5,389,201 Feb.
14, 1995
(effective filing date Feb. 28,
1992)
John R. Lavigne, Instrumentation Applications for the Pulp and
2
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