Appeal No. 1998-3049
Application No. 08/463,558
APPEALED SUBJECT MATTER
Claims 18 and 35 are representative of the subject matter on
appeal and read as follows:
Claim 18. A process for the chlorine free bleaching of cellulose
pulp in an aqueous suspension at a consistency of 5-25%, using a
pressurized fluidizing mixer and a reaction vessel, comprising the
steps of:
(a) forming a suspension of cellulose pulp having a
consistency of 5-25%;
(b) introducing in a substantially non-consumable carrier gas,
and as the only bleaching agent, ozone into the cellulose pulp
having a consistency of 5-25%, and intimately mixing the ozone and
pulp together in the pressurized fluidizing mixer, to produce a
reaction mixture;
(c) transferring the reaction mixture from the pressurized
fluidizing mixer to a pressurized reaction vessel, and continuing
ozone bleaching of the pulp in the pressurized reaction vessel; and
(d) discharging ozone-bleached pulp from the pressurized
reaction vessel.
Claim 35. A method of bleaching cellulose pulp having a
consistency of 5-25% with ozone, comprising the steps of:
pumping the cellulose pulp at a consistency of 5-25% to a
pressurized fluidizing mixer;
introducing a mixture of oxygen and ozone gas into the
cellulose pulp having a consistency of 5-25%;
mixing the gas mixture with pulp in the pressurized fluidizing
mixer to form a foam-like mixture composed of fibers, liquid,
oxygen and ozone, and to provide contact between the fibers and the
ozone acting as the bleaching chemical;
ozone bleaching the pulp while in said foam-like mixture;
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