Method of bleaching cellulose pulp with peroxide under elevated

Details Method of bleaching cellulose pulp with peroxide under elevated Method of bleaching cellulose pulp with peroxide under elevated

1996-02-16

1998-06-16

Alvo, Steven

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Charging and/or discharging fibrous material

162 65, 162 78, D21C 706, D21C 708, D21C 9147, D21C 916

Patent

active

057664145

ABSTRACT:
Bleaching of cellulose pulp with peroxide is accomplished and has the advantages of conventional pressurized peroxide bleaching without the need for a large pressurized vessel. Pulp at a consistency of between about 8-20% is mixed with peroxide and introduced into a first relatively-small treatment vessel where it is held at a pressure of between about 3-20 bar, and is treated for between 10-60 minutes. Pulp reacts with the peroxide so that there is less than 5 kg of hydrogen peroxide per ton of pulp remaining, and then between about 40-90% of the gas is separated from the pulp at or adjacent discharge of the pulp from the first vessel. The pulp is then passed to a second substantially-unpressurized bleaching tower having an interior volume at least about twice as great as the first vessel. The pulp is introduced into the bottom of the second vessel and flows upwardly in it and is discharged from adjacent the top of the second vessel. The pulp discharged from the top of the second vessel is passed to a second pretreatment stage substantially only under the influence of gravity (avoiding the need for a pump in the discharge).

REFERENCES:
Stromberg, 1994 Int. Pulp Bleaching Conf. Jun. 13-16, 1994.
Basta et al, "Alternatives For Bleaching High Brightness TCF Pulps", Int. Non-Chlorine Bleaching Conf. Mar. 6-10 1994.

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