Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Continuous chemical treatment or continuous charging or...
Patent
1990-01-16
1991-07-23
Fisher, Richard V.
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Continuous chemical treatment or continuous charging or...
162 65, 162 90, 162233, 162237, 162246, D21C 302, D21D 700
Patent
active
050340956
ABSTRACT:
A cellulose pulp slurry is delignified in an apparatus comprising a vertical cylindrical barrel chamber, a cone-shaped bottom chamber connected to the barrel chamber and having a circular inlet formed in a lower end portion thereof, and a cone-shaped top chamber connected to the barrel chamber and having a circular outlet formed in a top end portion thereof, in which apparatus the cone-shaped top and bottom chambers converge at a convergence angle of 60 degrees or less respectively, by feeding a cellulose pulp slurry containing an alkali and oxygen and having a pulp consistency of 8 to 15% into the apparatus through the circular inlet of the bottom chamber at 70.degree. C. to 140.degree. C., and discharging the pulp slurry through the circular outlet of the top chamber, while controlling the flow speed of the pulp slurry in the barrel chamber to a level of 0.4 m/min or more.
REFERENCES:
patent: 3353561 (1967-11-01), Monteleone
patent: 3398576 (1968-08-01), Cleary
patent: 3881985 (1975-05-01), Simmons et al.
patent: 4101280 (1978-07-01), Frietzsche et al.
patent: 4548625 (1985-10-01), Ishida et al.
Hirasawa Masaru
Kido Jun-ichiro
Tsuchiya Keiichi
Yamanaka Hajime
Fisher Richard V.
Friedman Charles K.
Oji Paper Co. Ltd.
LandOfFree
Apparatus and process for the delignification of cellulose pulp does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus and process for the delignification of cellulose pulp, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus and process for the delignification of cellulose pulp will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-430715