Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Continuous chemical treatment or continuous charging or...
Reexamination Certificate
2006-09-26
2006-09-26
Alvo, Steve (Department: 1731)
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Continuous chemical treatment or continuous charging or...
C162S037000, C162S039000, C162S040000, C162S047000
Reexamination Certificate
active
07112256
ABSTRACT:
A method for the continuous cooking of chemical pulp with the aim of achieving improved heat economy in a digester system having a vessel (1) for impregnation and a vessel (2) for cooking the impregnated cellulose chips. A part of the black liquor (14) withdrawn from the digester (2) is added at the beginning of a transfer system (4) to increase the temperature of the chips mixture in the transfer system (4). A fraction of the transport fluid (10) from the transfer system (4) that is continuously withdrawn from the impregnated chips fed into the top of the digester is returned to the impregnation vessel (1) at essentially the maintained transfer temperature.
REFERENCES:
patent: 5089086 (1992-02-01), Silander
patent: 5679217 (1997-10-01), Outzen et al.
patent: 5716497 (1998-02-01), Richter et al.
patent: 5824187 (1998-10-01), Richter et al.
patent: 6123807 (2000-09-01), Engstrom et al.
Gustavsson Lennart
Snekkenes Vidar
Alvo Steve
Fasth Rolf
Fasth Law Offices
Kvaerner Pulping AB
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