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Class Information
Number: 162/41
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 > Recirculation (includes separation from fibers)
Description: Processes in which the used fiber liberation or treating agent is separated from the fibrous mass and returned and reused on the same fibrous material.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7566380 |
Continuous digester with fluid circulation |
Jul. 28, 2009 |
| 7560008 |
Extraction with compaction and springback considerations |
Jul. 14, 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 |
| 7396434 |
Catalytic reactor process for the production of commercial grade pulp, native lignin and unicellular protein |
Jul. 8, 2008 |
| 7364640 |
Chemimechanical desilication of nonwood plant materials |
Apr. 29, 2008 |
| 7309401 |
Top separator for gas phase and hydraulic phase continuous digesters and method for converting digester |
Dec. 18, 2007 |
| 7297225 |
Process for high temperature peroxide bleaching of pulp with cool discharge |
Nov. 20, 2007 |
| 7285179 |
Continuous digester for cellulose pulp including method and recirculation system for such digester |
Oct. 23, 2007 |
| 7282115 |
Method for mitigating the interference caused by high-molecular weight-by-products in pulping processes |
Oct. 16, 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 |
| 7241363 |
Methods to decrease scaling in digester systems |
Jul. 10, 2007 |
| 7217338 |
Process for continuously cooking chemical cellulose pulp |
May. 15, 2007 |
| 6752903 |
Method for mitigating the interference caused by high-molecular weight by-products in pulping processes |
Jun. 22, 2004 |
| 6746568 |
Treatment of filtrates from peroxide bleaching of pulp |
Jun. 8, 2004 |
| 6551462 |
System for feeding comminuted fibrous material |
Apr. 22, 2003 |
| 6514379 |
Procedure for arranging water circulations in integrated paper mill |
Feb. 4, 2003 |
| 6413367 |
Treatment of cellulosic material with a chelating agent prior to alkaline delignification |
Jul. 2, 2002 |
| 6361649 |
Method for the continuous cooking of chemical pulp |
Mar. 26, 2002 |
| 6332950 |
Method in connection with the pretreatment of comminuted fibrous material |
Dec. 25, 2001 |
| 6325889 |
Hydraulic vessel system having a downwardly feeding separator |
Dec. 4, 2001 |
| 6277240 |
Method for continuously pulping cellulosic fibrous material |
Aug. 21, 2001 |
| 6241851 |
Treatment of cellulose material with additives while producing cellulose pulp |
Jun. 5, 2001 |
| 6235151 |
Inhibiting scaling in alkaline waste liquor evaporators |
May. 22, 2001 |
| 6203662 |
Method for the continuous cooking of pulp in a digester system having a top separator |
Mar. 20, 2001 |
| 6174411 |
Continuous digester with inverted top separator |
Jan. 16, 2001 |
| 6159336 |
Method and device for the continuous cooking of pulp |
Dec. 12, 2000 |
| 6132556 |
Method of controlling pulp digester pressure via liquor extraction |
Oct. 17, 2000 |
| 6123808 |
Distribution of dilution liquor to the discharge of a cellulose pulp digester |
Sep. 26, 2000 |
| 6123807 |
Method for the continuous cooking of pulp |
Sep. 26, 2000 |
| 6103058 |
Method for the continuous cooking of pulp |
Aug. 15, 2000 |
| 6030492 |
Impregnation of cellulose-containing material with black liquor in a single vessel digester |
Feb. 29, 2000 |
| 5980689 |
Method of separating metal ions from pulp using a chelating agent |
Nov. 9, 1999 |
| 5925216 |
Method of continuous pulping in a digester with high black liquor usage in the impregnation stage |
Jul. 20, 1999 |
| 5882477 |
Continuous digester with a low temperature gas-phase |
Mar. 16, 1999 |
| 5824187 |
Method for the continuous cooking of pulp |
Oct. 20, 1998 |
| 5716497 |
Method and device for the continuous cooking of pulp |
Feb. 10, 1998 |
| 5705032 |
Black liquor viscosity control |
Jan. 6, 1998 |
| 5676795 |
Process for the production of viscose pulp |
Oct. 14, 1997 |
| 5674359 |
Continuous cooking of cellulosic fibrous material with cold alkali impregnation |
Oct. 7, 1997 |
| 5662775 |
Continuous digester with dissolved solids handling |
Sep. 2, 1997 |
| 5660686 |
Cooking with spent liquor pretreatment of cellulose material |
Aug. 26, 1997 |
| 5593544 |
Pulp production |
Jan. 14, 1997 |
| 5529661 |
Process for controlling the flow of cellulosic fiber material through an impregnation vessel |
Jun. 25, 1996 |
| 5507913 |
Solvent recovery in pulp bleaching with ozone |
Apr. 16, 1996 |
| 5472568 |
Method for controlling the viscosity of Kraft black liquor |
Dec. 5, 1995 |
| 5413675 |
Method of deinking laser printed wastepaper |
May. 9, 1995 |
| 5401361 |
Completely coutercurrent cook continuous digester |
Mar. 28, 1995 |
| 5302247 |
Top circulation line cooling for a modified cook digester |
Apr. 12, 1994 |
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