Appeal No. 1999-0678
Application No. 08/462,691
18. A method of bleaching cellulose pulp having a
consistency between 5-25% in a stage wherein ozone is the
only bleaching agent in the stage, comprising the steps of:
(a) introducing the pulp with a consistency between 5-
25% into a fluidizing mixer;
(b) introducing a mixture of ozone, serving as the only
bleaching agent in the stage, and oxygen gas into the
fluidizing mixer;
(c) intensely mixing the pulp and the gas in the
fluidizing mixer for approximately one second so as to form
a foam, the ozone, as the only bleaching agent in the stage,
reacting with the pulp while in foam configuration to effect
bleaching; and
(d) removing residual gas from the pulp after the
reaction in step (c).
REFERENCES
In support of his rejections, the examiner relies on the
following prior art references :1
Meredith 4,902,381 Feb. 20, 1990
(filed Dec. 9, 1988)
Backlund et al (Backlund) 1063409 Oct. 2, 19792
(Published Canadian Patent Application)
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