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Class Information
Number: 162/42
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) > With treatment of fluids during recirculation
Description: Processes in which some property of the digestion fluid is altered during the circulation thereof.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7591143 |
Vehicle air conditioning and heating system providing engine on and engine off operation |
Sep. 22, 2009 |
| 7445691 |
Impregnation of chips with an acid liquid prior to a sulphate pulping process |
Nov. 4, 2008 |
| 7364640 |
Chemimechanical desilication of nonwood plant materials |
Apr. 29, 2008 |
| 7351306 |
Cooking of cellulose pulp in a cooking liquor containing pre-evaporated black liquor |
Apr. 1, 2008 |
| 7297225 |
Process for high temperature peroxide bleaching of pulp with cool discharge |
Nov. 20, 2007 |
| 7282115 |
Method for mitigating the interference caused by high-molecular weight-by-products in pulping processes |
Oct. 16, 2007 |
| 7217338 |
Process for continuously cooking chemical cellulose pulp |
May. 15, 2007 |
| 6942754 |
Process for producing xylooligosaccharide from lignocellulose pulp |
Sep. 13, 2005 |
| 6824646 |
Process for oxygen bleaching and enzyme treating lignocellulosic pulp with liquid treatment and recovery |
Nov. 30, 2004 |
| 6787574 |
Emulsification of alkenyl succinic anhydride size |
Sep. 7, 2004 |
| 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 |
| 6715307 |
Air conditioner for vehicle |
Apr. 6, 2004 |
| 6350348 |
Batch cooking with black liquor pretreatment |
Feb. 26, 2002 |
| 6346167 |
Dissolved solids control in pulp production |
Feb. 12, 2002 |
| 6332950 |
Method in connection with the pretreatment of comminuted fibrous material |
Dec. 25, 2001 |
| 6261413 |
Continuously guiding liquids in a digester during pulp digestion |
Jul. 17, 2001 |
| 6235151 |
Inhibiting scaling in alkaline waste liquor evaporators |
May. 22, 2001 |
| 6159337 |
Dissolved organic materials control in cellulose pulp production |
Dec. 12, 2000 |
| 6143130 |
Polysulfide pulping process |
Nov. 7, 2000 |
| 6086712 |
DOM control in cellulose pulp production |
Jul. 11, 2000 |
| 6063238 |
Black liquor impregnation in digester |
May. 16, 2000 |
| 6030492 |
Impregnation of cellulose-containing material with black liquor in a single vessel digester |
Feb. 29, 2000 |
| 5849151 |
Continuous digester having means for implementing low dissolved solids profiling |
Dec. 15, 1998 |
| 5849150 |
Low dissolved solids control in pulp production |
Dec. 15, 1998 |
| 5843316 |
Method of separating sodium hydroxide from white liquor or polysulfide liquor using diffusion dialysis |
Dec. 1, 1998 |
| 5766413 |
Process for isothermal cooking pulp in a continuous digester |
Jun. 16, 1998 |
| 5658428 |
Method for impregnation in a single-vessel hydraulic digester |
Aug. 19, 1997 |
| 5635026 |
Cooking cellulose material with high alkali concentrations and/or high pH |
Jun. 3, 1997 |
| 5635027 |
Method of reducing the viscosity of a black liquor |
Jun. 3, 1997 |
| 5620562 |
Dissolved solids control in pulp production |
Apr. 15, 1997 |
| 5547012 |
Dissolved solids control in pulp production |
Aug. 20, 1996 |
| 5529661 |
Process for controlling the flow of cellulosic fiber material through an impregnation vessel |
Jun. 25, 1996 |
| 5510035 |
Method of separating sodium hydroxide from white liquor |
Apr. 23, 1996 |
| 5489363 |
Pulping with low dissolved solids for improved pulp strength |
Feb. 6, 1996 |
| 5437791 |
Method for purifying process water from pulp manufacture |
Aug. 1, 1995 |
| 5413677 |
Method for producing chemical pulp from hardwood chips |
May. 9, 1995 |
| 5360514 |
Treatment of bleach plant filtrations using a magnesium filter |
Nov. 1, 1994 |
| 5302247 |
Top circulation line cooling for a modified cook digester |
Apr. 12, 1994 |
| 5069752 |
Digester screen switching |
Dec. 3, 1991 |
| 4944840 |
Method and apparatus for evaporating waste liquor produced when cooking fibrous material containing cellulose |
Jul. 31, 1990 |
| 4681935 |
Procedure for recovering soluble carbohydrates contained in wood |
Jul. 21, 1987 |
| 4670098 |
Process for preparing cellulose pulp from lignocellulosic material while removing high molecular weight substances from the pulping liquor |
Jun. 2, 1987 |
| 4242177 |
Method for oxidizing malodorous sulfur compounds in kraft cooking liquor |
Dec. 30, 1980 |
| 4193839 |
Flow control method and apparatus for continuous wood chip digester screenless liquor extractor |
Mar. 18, 1980 |
| 4188261 |
Method of improving the homogeneity of lignocellulose containing material |
Feb. 12, 1980 |
| 4141787 |
Process for preparing chemical cellulose according to the sulfite process by increasing the total SO.sub.2 content of cooking acid with liquid SO.sub.2 and digesting wood chips |
Feb. 27, 1979 |
| 4123318 |
Three-vessel treatment system |
Oct. 31, 1978 |
| 4104113 |
Two-stage digestion with between vessel heating |
Aug. 1, 1978 |
| 4100016 |
Solvent pulping process |
Jul. 11, 1978 |
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