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Class Information
Number: 162/45
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 > With addition of chemicals to recirculating fluid
Description: Processes in which chemicals, other than water or steam, are added to the fiber treating fluid being recirculated.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7029553 |
Urea sulfate and urea hydrochloride in paper and pulp processing |
Apr. 18, 2006 |
| 6866748 |
Process for preparing polysulfides using clarified white liquor |
Mar. 15, 2005 |
| 6824646 |
Process for oxygen bleaching and enzyme treating lignocellulosic pulp with liquid treatment and recovery |
Nov. 30, 2004 |
| 6746568 |
Treatment of filtrates from peroxide bleaching of pulp |
Jun. 8, 2004 |
| 6280568 |
Dissolved organic material control in a cellulose pulp continuous digester |
Aug. 28, 2001 |
| 6261413 |
Continuously guiding liquids in a digester during pulp digestion |
Jul. 17, 2001 |
| 6254723 |
Method for continuous cooking in a single-vessel digester |
Jul. 3, 2001 |
| 6143130 |
Polysulfide pulping process |
Nov. 7, 2000 |
| 6063238 |
Black liquor impregnation in digester |
May. 16, 2000 |
| 6054019 |
Impregnation of fiber material in two subsequent concurrent impregnation zones |
Apr. 25, 2000 |
| 5885414 |
Method of producing pulp with high alkali cooking in the last cooking stage |
Mar. 23, 1999 |
| 5788813 |
Clarifying and/or filtering of green liquor and an apparatus therefore |
Aug. 4, 1998 |
| 5779856 |
Cooking cellulose material using high alkali concentrations and/or high pH near the end of the cook |
Jul. 14, 1998 |
| 5672279 |
Method for using urea hydrochloride |
Sep. 30, 1997 |
| 5662775 |
Continuous digester with dissolved solids handling |
Sep. 2, 1997 |
| 5658428 |
Method for impregnation in a single-vessel hydraulic digester |
Aug. 19, 1997 |
| 5620562 |
Dissolved solids control in pulp production |
Apr. 15, 1997 |
| 5575890 |
Method for selectively increasing the sulfide ion concentration and sulfidity of kraft cooking liquor during kraft cooking of wood |
Nov. 19, 1996 |
| 5547012 |
Dissolved solids control in pulp production |
Aug. 20, 1996 |
| 5536366 |
Digester system for implementing low dissolved solids profiling |
Jul. 16, 1996 |
| 5527427 |
High solids black liquor of reduced viscosity and viscosity reduction method for high solids black liquor |
Jun. 18, 1996 |
| 5522958 |
Two-stage kraft cooking |
Jun. 4, 1996 |
| 5468393 |
Methods of controlling scale formation in the presence of metal ions in aqueous systems |
Nov. 21, 1995 |
| 5437791 |
Method for purifying process water from pulp manufacture |
Aug. 1, 1995 |
| 5368740 |
Methods of controlling scale formation in the presence of metal ions in aqueous systems |
Nov. 29, 1994 |
| 5213663 |
Method for controlling the sodium carbonate concentration of green liquor in the dissolving tank |
May. 25, 1993 |
| 5145556 |
Single-stage slaking and causticizing method |
Sep. 8, 1992 |
| 5108655 |
Foam monitoring control system |
Apr. 28, 1992 |
| 5096540 |
Method for recycling sulfur dioxide from sulfite pulping liquors |
Mar. 17, 1992 |
| 4853082 |
Process for the activation and delignification of cellulose pulp |
Aug. 1, 1989 |
| 4849052 |
Batch digester multi-stage pulping process |
Jul. 18, 1989 |
| 4838995 |
Process for bleaching cellulose pulp, a plant for preforming said process, and a screw press for use with said process and plant |
Jun. 13, 1989 |
| 4761238 |
Method of treatment of the circulation water of a paper mill |
Aug. 2, 1988 |
| 4690731 |
Method of making sulphate pulp |
Sep. 1, 1987 |
| 4601787 |
Method of bringing a digester up to cooking temperature |
Jul. 22, 1986 |
| 4561936 |
Process for the conversion of lignocellulosic material to cellulose pulp by alkaline preoxidation followed by alkaline oxygen-free digestion both in the presence of a redox additive |
Dec. 31, 1985 |
| 4537656 |
Method for delignifying or bleaching cellulose pulp wherein chlorine is added to recycle liquor to regenerate chlorine dioxide |
Aug. 27, 1985 |
| 4466861 |
Process for the inhibition of the formation of deposits in cellulose pulping and cellulose pulp treating processes |
Aug. 21, 1984 |
| 4456750 |
Method for controlling the alkalinity of feed circulation when prehydrolyzing wood chips |
Jun. 26, 1984 |
| 4218284 |
Process for the inhibition of the formation of deposits in cellulose pulping and cellulose pulp treating processes |
Aug. 19, 1980 |
| 4207139 |
Method for producing groundwood pulp |
Jun. 10, 1980 |
| 4207140 |
Method of producing groundwood pulp |
Jun. 10, 1980 |
| 4135967 |
Process for producing cellulose pulp by solid phase digestion |
Jan. 23, 1979 |
| 4123318 |
Three-vessel treatment system |
Oct. 31, 1978 |
| 3969184 |
Digestion odor control |
Jul. 13, 1976 |
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