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Class Information
Number: 162/19
Name: Paper making and fiber liberation > Processes of chemical liberation, recovery or purification of natural cellulose or fibrous material > Continuous chemical treatment or continuous charging or discharging > Plural diverse stage treatment
Description: Processes in which the fibrous material is subjected to a plurality of dissimilar chemical treatments.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7615134 |
Method and arrangement of impregnating chips |
Nov. 10, 2009 |
| 7566380 |
Continuous digester with fluid circulation |
Jul. 28, 2009 |
| 7547374 |
Method for impregnating chips in a continuous digestion system |
Jun. 16, 2009 |
| 7540938 |
Method and system for energy savings in TMP by high temperature LC/MC refining of pulp |
Jun. 2, 2009 |
| 7501043 |
Steam treatment of chips with the addition of an acid liquid |
Mar. 10, 2009 |
| 7455749 |
Gas phase continuous digester having an inverted top separator with liquor injection |
Nov. 25, 2008 |
| 7445691 |
Impregnation of chips with an acid liquid prior to a sulphate pulping process |
Nov. 4, 2008 |
| 7402224 |
Method for producing paper pulp, lignins, sugars and acetic acid by frantionation of lignocellulosic vegetable material in formic/acetic acid medium |
Jul. 22, 2008 |
| 7381302 |
Method and arrangement for impregnating chips |
Jun. 3, 2008 |
| 7381303 |
System and method for controlling a thermo-mechanical wood pulp refiner |
Jun. 3, 2008 |
| 7374637 |
Method of bleaching cellulose pulp with a main conduit for wash liquor and filtrate |
May. 20, 2008 |
| 7351305 |
Method and a digester for the continuous cooking of wood raw material to cellulose pulp |
Apr. 1, 2008 |
| 7351306 |
Cooking of cellulose pulp in a cooking liquor containing pre-evaporated black liquor |
Apr. 1, 2008 |
| 7303649 |
Removal of inorganic elements from wood chips |
Dec. 4, 2007 |
| 7285179 |
Continuous digester for cellulose pulp including method and recirculation system for such digester |
Oct. 23, 2007 |
| 7279070 |
Method for the continuous cooking of wood raw material for cellulose pulp |
Oct. 9, 2007 |
| 7270725 |
Pretreatment of chips with white liquor prior to a treatment with black liquor |
Sep. 18, 2007 |
| 7252739 |
Method for distributing cellulose pulp of low and medium consistency in order to form a uniform pulp web |
Aug. 7, 2007 |
| 7229524 |
Feeding arrangement for feeding of chips to chip bins |
Jun. 12, 2007 |
| 7217338 |
Process for continuously cooking chemical cellulose pulp |
May. 15, 2007 |
| 7156952 |
Method and arrangement for oxygen delignification of cellulose pulp |
Jan. 2, 2007 |
| 7112256 |
Method for continuous cooking of chemical pulp to improve heat economy |
Sep. 26, 2006 |
| 7105076 |
Gas phase continuous digester having an inverted top separator with liquor injection |
Sep. 12, 2006 |
| RE39208 |
Method of treating material in a continuous digester |
Aug. 1, 2006 |
| 6986828 |
Process for producing low DP microcrystalline cellulose |
Jan. 17, 2006 |
| 6966970 |
Method for supplying washing liquid to a process for cooking cellulose pulp |
Nov. 22, 2005 |
| 6881298 |
Process for loading fibers with calcium carbonate in a plurality of reactors |
Apr. 19, 2005 |
| 6841036 |
Process for the oxygen delignification of pulp in two stages with higher pressure in the second stage |
Jan. 11, 2005 |
| 6808596 |
System for the oxygen delignification of pulp consisting of lignocellulose-containing material |
Oct. 26, 2004 |
| 6736934 |
Method of pretreating pulp in an acid tower prior to bleaching with peroxide |
May. 18, 2004 |
| 6716307 |
Process and system for the removal of scale build-up |
Apr. 6, 2004 |
| 6699357 |
Process for continuous cooking of pulp |
Mar. 2, 2004 |
| 6620292 |
Cellulose production from lignocellulosic biomass |
Sep. 16, 2003 |
| 6605180 |
Process for continuous cooking of pulp |
Aug. 12, 2003 |
| 6582554 |
Continuous digester having a sectioned top separator with multiple liquor extraction ports |
Jun. 24, 2003 |
| 6576084 |
Method of pretreating pulp with yield or strength-enhancing additive |
Jun. 10, 2003 |
| 6572734 |
Method for treatment of loose material |
Jun. 3, 2003 |
| 6544384 |
Pretreatment of chips before cooking |
Apr. 8, 2003 |
| 6533896 |
Method for the production of precleaned pulp |
Mar. 18, 2003 |
| 6475338 |
Method of minimizing transition metal ions during chemical pulping in a digester by adding chelating agent to the digester |
Nov. 5, 2002 |
| 6468390 |
Method for continuous cooking of lignocellulosic fiber material |
Oct. 22, 2002 |
| 6454900 |
Method for two-stage oxygen delignification of chemical pulp |
Sep. 24, 2002 |
| 6447645 |
Feeding cellulose material to a treatment vessel |
Sep. 10, 2002 |
| 6419788 |
Method of treating lignocellulosic biomass to produce cellulose |
Jul. 16, 2002 |
| 6391152 |
Process for the oxygen delignification of pulp in two stages with higher pressure in the second stage |
May. 21, 2002 |
| 6375796 |
Method of treating material in a continuous digester |
Apr. 23, 2002 |
| 6361649 |
Method for the continuous cooking of chemical pulp |
Mar. 26, 2002 |
| 6350348 |
Batch cooking with black liquor pretreatment |
Feb. 26, 2002 |
| 6344112 |
Screen having inclined slots for a digester |
Feb. 5, 2002 |
| 6325888 |
Method for pulping sawdust |
Dec. 4, 2001 |
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