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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:

Class Number Class Name Patents
162/46 Steam only 29
162/42 With treatment of fluids during recirculation 61

Patents under this class:
1 2

Patent Number Title Of Patent Date Issued
8623175 Process for the conversion of lignocellulosic solutions containing a high proportion of dry material Jan. 7, 2014
8475627 Process of treating a lignocellulosic material Jul. 2, 2013
8468714 Method for the simultaneous storage and drying of sewage sludge Jun. 25, 2013
8273212 Method for kraft pulp production where hemicelluloses are returned Sep. 25, 2012
8262853 Methods for pretreatment and processing of biomass Sep. 11, 2012
8262854 Method for recovering hydrolysis products Sep. 11, 2012
8197639 Vapour phase digester and a method for continuous cooking Jun. 12, 2012
8157955 Method and system for the large scale collection of ligno-cellulosic biomass Apr. 17, 2012
8057635 Method and system for the large scale collection, preparation, handling and refining of ligno-cellulosic biomass Nov. 15, 2011
7943009 Process of treating a lignocellulosic material with an alkali metal borate pre-extraction step May. 17, 2011
7918967 Apparatus for decreasing scaling in digester systems Apr. 5, 2011
7842161 Pre-extraction and solvent pulping of lignocellulosic material Nov. 30, 2010
7824521 Process of treating a lignocellulosic material with hemicellulose pre-extraction and hemicellulose adsorption Nov. 2, 2010
7658818 Method for converting a digester for use as a gas phase and hydraulic phase continuous digester Feb. 9, 2010
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
6123807 Method for the continuous cooking of pulp Sep. 26, 2000
6123808 Distribution of dilution liquor to the discharge of a cellulose pulp digester 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

1 2

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