Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Continuous chemical treatment or continuous charging or...
Patent
1992-10-20
1995-03-28
Jones, W. Gary
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Continuous chemical treatment or continuous charging or...
162 39, 162 41, 162238, D21C 700, D21C 324
Patent
active
054013615
ABSTRACT:
A conventional continuous digester is modified so as to provide a countercurrent cook throughout the entire height of the digester. Instead of connecting an upper mid-point extraction screen to a flash tank, that screen is closed off and extraction is provided at the top of the digester, utilizing an in-line drainer to remove some of the liquor and feed it to a flash tank. The liquor not removed recirculates through a pressure screen to an impregnation vessel, and then back to the digester. A cooling circulation is provided just below the top extraction. Valves are provided in the liquor discharged from the drainer and a conduit from the upper mid-point extraction which may be manipulated to return the digester to conventional operation, including the addition of white liquor to the bottom recirculation.
REFERENCES:
patent: 3097987 (1963-07-01), Sloman
patent: 3294623 (1966-12-01), Brinkley, Jr. et al.
patent: 3654070 (1970-04-01), Pradt et al.
patent: 5053108 (1991-10-01), Richter
patent: 5069752 (1991-12-01), Richter
patent: 5089086 (1992-02-01), Silander
Sven Rydohlm, "Continuous Pulping Processes", Tech. Assoc. of Pulp & Paper Ind., No. 7, 1970, pp. 124-133.
"CPPA Tech '91" Kraft Pulping Course, Continuous Digesters Section III-MCC, Greenwood, B., Kamyr, Inc., Apr. 1991, 3.1-3.4.
Laakso Richard O.
Marcoccia Bruno S.
Prough J. Robert
Stromberg C. Bertil
Jones W. Gary
Kamyr Inc.
Nguyen Dean T.
LandOfFree
Completely coutercurrent cook continuous digester does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Completely coutercurrent cook continuous digester, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Completely coutercurrent cook continuous digester will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2247840