Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Including recovery of organic by-product
Patent
1997-06-11
2000-08-15
Alvo, Steven
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Including recovery of organic by-product
162 49, 162 52, 162 82, D21C 300, D21C 1106
Patent
active
061030570
ABSTRACT:
A method for use in a batch digesting process is provided which includes the removal of a portion of the hot cooking liquor from the digester prior to the cook creating a liquid-vapor interface in the digester followed by the removal or purging of the vapors disposed above the liquid-vapor interface and the reduction of the pressure in the digester to about the saturation pressure of the hot cooking liquor. The inclusion of these steps in the process helps to eliminate a coating on the pulp fibers which has been found to inhibit the bleachability and runability of the fibers. Accordingly, an apparatus and method for the batch digesting of pulp fibers is provided which provides pulp fibers having improved bleachability and runability characteristics.
REFERENCES:
patent: 1885918 (1932-11-01), Kenety
patent: 2861884 (1958-11-01), Bennett
patent: 3843468 (1974-10-01), Laakso
patent: 3928123 (1975-12-01), Marks
patent: 4274911 (1981-06-01), Fagerlund
patent: 4578149 (1986-03-01), Fagerlund
patent: 4601787 (1986-07-01), Fagerlund
patent: 4849052 (1989-07-01), Grant
patent: 5059281 (1991-10-01), Andrews
patent: 5059284 (1991-10-01), Fagerlund
patent: 5080757 (1992-01-01), Fagerlund
patent: 5643410 (1997-07-01), Hiljanen et al.
patent: 5882477 (1999-03-01), Laakso et al.
LandOfFree
Kraft digesting process wherein a vapor interface is formed by w does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Kraft digesting process wherein a vapor interface is formed by w, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Kraft digesting process wherein a vapor interface is formed by w will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2002707