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Class Information
Number: 162/39
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 > With addition of chemicals prior to reuse > In digester
Description: Processes in which the chemicals are added to the used digestion fluid in the digester in which the regenerated fluid is employed for digesting or treating the second batch of fibrous material.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7112256 |
Method for continuous cooking of chemical pulp to improve heat economy |
Sep. 26, 2006 |
| 7056418 |
Cooking method for pulp |
Jun. 6, 2006 |
| 6544384 |
Pretreatment of chips before cooking |
Apr. 8, 2003 |
| 6475338 |
Method of minimizing transition metal ions during chemical pulping in a digester by adding chelating agent to the digester |
Nov. 5, 2002 |
| 6350348 |
Batch cooking with black liquor pretreatment |
Feb. 26, 2002 |
| 6344112 |
Screen having inclined slots for a digester |
Feb. 5, 2002 |
| 6315861 |
Process for conditioning ozone gas recycle stream in ozone pulp bleaching |
Nov. 13, 2001 |
| 6203662 |
Method for the continuous cooking of pulp in a digester system having a top separator |
Mar. 20, 2001 |
| 6103058 |
Method for the continuous cooking of pulp |
Aug. 15, 2000 |
| 6054019 |
Impregnation of fiber material in two subsequent concurrent impregnation zones |
Apr. 25, 2000 |
| 6039841 |
Screen having inclined slots for use in a continuous digester |
Mar. 21, 2000 |
| 5985096 |
Vertical pulping digester having substantially constant diameter |
Nov. 16, 1999 |
| 5958181 |
Continuous cooking with a two-stage cool impregnation |
Sep. 28, 1999 |
| 5925216 |
Method of continuous pulping in a digester with high black liquor usage in the impregnation stage |
Jul. 20, 1999 |
| 5885414 |
Method of producing pulp with high alkali cooking in the last cooking stage |
Mar. 23, 1999 |
| 5788812 |
Method of recovering furfural from organic pulping liquor |
Aug. 4, 1998 |
| 5635027 |
Method of reducing the viscosity of a black liquor |
Jun. 3, 1997 |
| 5635026 |
Cooking cellulose material with high alkali concentrations and/or high pH |
Jun. 3, 1997 |
| 5575890 |
Method for selectively increasing the sulfide ion concentration and sulfidity of kraft cooking liquor during kraft cooking of wood |
Nov. 19, 1996 |
| 5522958 |
Two-stage kraft cooking |
Jun. 4, 1996 |
| 5413677 |
Method for producing chemical pulp from hardwood chips |
May. 9, 1995 |
| 5401361 |
Completely coutercurrent cook continuous digester |
Mar. 28, 1995 |
| 5346591 |
Apparatus for treatment of chips with heated black liquor |
Sep. 13, 1994 |
| 5296097 |
Method for reducing contaminants in pulp prior to ozone bleaching |
Mar. 22, 1994 |
| 5256255 |
Displacement heating in continuous digesters |
Oct. 26, 1993 |
| 5236553 |
Continuous cooking with reduced horsepower and pulp degradation |
Aug. 17, 1993 |
| 5213662 |
Treatment of chips with high temperature black liquor to reduce black liquor viscosity |
May. 25, 1993 |
| 5192396 |
Process for the continuous digestion of cellulosic fiber material |
Mar. 9, 1993 |
| 5080755 |
Process for the continuous digestion of cellulosic fiber material |
Jan. 14, 1992 |
| 5069752 |
Digester screen switching |
Dec. 3, 1991 |
| 5053108 |
High sulfidity cook for paper pulp using black liquor sulfonization of steamed chips |
Oct. 1, 1991 |
| 5013454 |
Method of removing organic substances from effluents from pulp and paper manufacturing processes |
May. 7, 1991 |
| 4853082 |
Process for the activation and delignification of cellulose pulp |
Aug. 1, 1989 |
| 4849052 |
Batch digester multi-stage pulping process |
Jul. 18, 1989 |
| 4842688 |
Method of removing macromolecular organic dissolved and colloidal material from wood processing industry effluents |
Jun. 27, 1989 |
| 4812207 |
Method of removing lignin from bleach plant effluents |
Mar. 14, 1989 |
| 4806203 |
Method for alkaline delignification of lignocellulosic fibrous material at a consistency which is raised during reaction |
Feb. 21, 1989 |
| 4764251 |
Method for the impregnation and cooking of lignocellulosic material by a batch cooking using spent impregnation liquor from a previous batch |
Aug. 16, 1988 |
| 4690731 |
Method of making sulphate pulp |
Sep. 1, 1987 |
| 4668340 |
Method of countercurrent acid hydrolysis of comminuted cellulosic fibrous material |
May. 26, 1987 |
| 4578149 |
Process for digesting cellulosic material with heat recovery |
Mar. 25, 1986 |
| 4466861 |
Process for the inhibition of the formation of deposits in cellulose pulping and cellulose pulp treating processes |
Aug. 21, 1984 |
| 4414060 |
Method for sulfite pulping using water-soluble molybdenum containing compounds |
Nov. 8, 1983 |
| 4218284 |
Process for the inhibition of the formation of deposits in cellulose pulping and cellulose pulp treating processes |
Aug. 19, 1980 |
| 4030968 |
Disposal of paper pulp mill sludge |
Jun. 21, 1977 |
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