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Class Information
Number: 162/37
Name: Paper making and fiber liberation > Processes of chemical liberation, recovery or purification of natural cellulose or fibrous material > With regeneration, reclamation, reuse, recycling or destruction of digestion fluid > Digestion fluid reused on different fibrous materials
Description: Processes in which liquor resulting from a chemical treatment of one batch of fibrous material is subsequently used for the chemical treatment of a different batch of fibrous material.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7553394 |
Method for removing potassium from ash produced in a kraft pulping process recovery boiler using a Na-type cation exchange organic resin |
Jun. 30, 2009 |
| 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 |
| 7374637 |
Method of bleaching cellulose pulp with a main conduit for wash liquor and filtrate |
May. 20, 2008 |
| 7285179 |
Continuous digester for cellulose pulp including method and recirculation system for such digester |
Oct. 23, 2007 |
| 7270725 |
Pretreatment of chips with white liquor prior to a treatment with black liquor |
Sep. 18, 2007 |
| 7182835 |
Two-stage chlorine bleaching process with filtrate recirculation |
Feb. 27, 2007 |
| 7112256 |
Method for continuous cooking of chemical pulp to improve heat economy |
Sep. 26, 2006 |
| 7097738 |
Process for producing pulp |
Aug. 29, 2006 |
| 6946057 |
Alkaline process for the manufacturing of pulp using alkali metaborate as buffering alkali |
Sep. 20, 2005 |
| 6942754 |
Process for producing xylooligosaccharide from lignocellulose pulp |
Sep. 13, 2005 |
| 6699357 |
Process for continuous cooking of pulp |
Mar. 2, 2004 |
| 6663749 |
Method for regenerating sodium hydroxide by partial autocausticizing sodium carbonate containing smelt by reaction with borate |
Dec. 16, 2003 |
| 6641699 |
Chemical wood pulping process with reduced pitch and VOC emissions |
Nov. 4, 2003 |
| 6605180 |
Process for continuous cooking of pulp |
Aug. 12, 2003 |
| 6569284 |
Elemental-chlorine-free bleaching process having an initial Eo or Eop stage |
May. 27, 2003 |
| 6544384 |
Pretreatment of chips before cooking |
Apr. 8, 2003 |
| 6468390 |
Method for continuous cooking of lignocellulosic fiber material |
Oct. 22, 2002 |
| 6350348 |
Batch cooking with black liquor pretreatment |
Feb. 26, 2002 |
| 6348128 |
Method of increasing the causticizing efficiency of alkaline pulping liquor by borate addition |
Feb. 19, 2002 |
| 6294048 |
Method for regenerating sodium hydroxide by partial autocausticizing sodium carbonate containing smelt by reaction with a borate |
Sep. 25, 2001 |
| 6277240 |
Method for continuously pulping cellulosic fibrous material |
Aug. 21, 2001 |
| 6203662 |
Method for the continuous cooking of pulp in a digester system having a top separator |
Mar. 20, 2001 |
| 6183597 |
Method of producing a pulp from cellulosic material using formic acid and hydrogen peroxide |
Feb. 6, 2001 |
| 6153300 |
Bleaching cellulose pulp having cleanliness which varies significantly over time using at least two different bleaching stages and bleaching chemicals |
Nov. 28, 2000 |
| 6106667 |
Treatment of recycled bleach plant filtrates |
Aug. 22, 2000 |
| 6103058 |
Method for the continuous cooking of pulp |
Aug. 15, 2000 |
| 6039837 |
Method of bleaching pulp with ozone wherein the acidity is maintained with an acid solution prepared by electrolysis or electrodialysis |
Mar. 21, 2000 |
| 6024833 |
Process for removing metals and recovering a chelating agent from a bleach plant waste liquor |
Feb. 15, 2000 |
| 5944951 |
Method for reusing spent gas from an ozone bleaching reactor |
Aug. 31, 1999 |
| 5925216 |
Method of continuous pulping in a digester with high black liquor usage in the impregnation stage |
Jul. 20, 1999 |
| 5788812 |
Method of recovering furfural from organic pulping liquor |
Aug. 4, 1998 |
| 5788813 |
Clarifying and/or filtering of green liquor and an apparatus therefore |
Aug. 4, 1998 |
| 5741398 |
Method of removing metal ions dissolved in the bleach plant waste water |
Apr. 21, 1998 |
| 5736006 |
Method and apparatus for pulping with controlled heating to improve delignification and pulp strength |
Apr. 7, 1998 |
| 5676795 |
Process for the production of viscose pulp |
Oct. 14, 1997 |
| 5645728 |
Hydrogen peroxide recovery from colored aqueous solutions |
Jul. 8, 1997 |
| 5643410 |
Batch process for preparing kraft pulp in a batch digesting process |
Jul. 1, 1997 |
| 5639347 |
Method of controlling of metals in a bleach plant, using oxidation |
Jun. 17, 1997 |
| 5593544 |
Pulp production |
Jan. 14, 1997 |
| 5589033 |
Production of prehydrolyzed pulp |
Dec. 31, 1996 |
| 5509999 |
Treatment of bleach plant effluents |
Apr. 23, 1996 |
| 5401362 |
Control of metals and dissolved organics in the bleach plant |
Mar. 28, 1995 |
| 5360514 |
Treatment of bleach plant filtrations using a magnesium filter |
Nov. 1, 1994 |
| 5346591 |
Apparatus for treatment of chips with heated black liquor |
Sep. 13, 1994 |
| 5256255 |
Displacement heating in continuous digesters |
Oct. 26, 1993 |
| 5213662 |
Treatment of chips with high temperature black liquor to reduce black liquor viscosity |
May. 25, 1993 |
| 5183535 |
Process for preparing kraft pulp using black liquor pretreatment reaction |
Feb. 2, 1993 |
| 5080757 |
Method to displace a digester from both ends |
Jan. 14, 1992 |
| 5069752 |
Digester screen switching |
Dec. 3, 1991 |
| 5061343 |
Recovery of NaOH and other values from spent liquors and bleach plant effluents |
Oct. 29, 1991 |
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