Method of oxygen delignifying wood pulp with between stage washi

Details Method of oxygen delignifying wood pulp with between stage washi Method of oxygen delignifying wood pulp with between stage washi

1989-04-25

1990-08-07

Alvo, Steve

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With washing

162 65, 162 76, D21C 104, D21C 902, D21C 9147

Patent

active

049465562

ABSTRACT:
The viscosity of paper pulp is maximized, while chlorine bleaching is minimized or eliminated, by subjecting the pulp suspension to multiple consecutive oxygen bleaching stages, with a countercurrent wash between O.sub.2 stages. A chelating agent--such as EDTA--may be added to the countercurrent wash liquid, and/or another chelating agent--such as DTPA--may be used to pretreat the pulp.

REFERENCES:
patent: 4050981 (1977-09-01), Jamieson
patent: 4295927 (1981-10-01), Bentvelzen et al.
patent: 4798652 (1989-01-01), Joyce
patent: 4806203 (1989-02-01), Elton
Enz et al., "Oxidative Extration: An Opportunity for Splitting the Bleach Plant"; TAPPI, Jun. 1984; pp. 54-57.
Tomiak et al., "Countercurrent Pulp Washing Theory: An Attempt at a Synthesis", TAPPI, vol. 60, No. 9, Sep. 1977, pp. 148-150.
Pulp & Paper Canada, vol. 81, No. 2, Feb., 1980, pp. 68 through 71, Histed "How to Avoid Viscosity Loss During Chlorination".

Affiliated with

Also associated with

Rating

Method of oxygen delignifying wood pulp with between stage washi does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method of oxygen delignifying wood pulp with between stage washi, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of oxygen delignifying wood pulp with between stage washi will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-958814