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Class Information
Number: 162/62
Name: Paper making and fiber liberation > Processes of chemical liberation, recovery or purification of natural cellulose or fibrous material > Regulatory > Concentration of chemicals
Description: Processes in which the operating condition controlled is the concentration of a fiber treating agent.

Patents under this class:
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Patent Number Title Of Patent Date Issued
7390669 Simultaneous and rapid determination of multiple component concentrations in a Kraft liquor process stream Jun. 24, 2008
7204914 System and method for controlling a processor including a digester utilizing time-based assessments Apr. 17, 2007
7074299 Process for using a phloroglucinol color delta to control blending, deinking and bleaching of groundwood-containing secondary pulp Jul. 11, 2006
6833054 Method and apparatus for adjusting chemical dosage of pulp processing stage Dec. 21, 2004
6524437 Process for peroxide bleaching wherein the concentrations of Mn and Fe are monitored and maintained Feb. 25, 2003
6447639 Process for controlling a digester using real time measurement of moisture content and species of wood Sep. 10, 2002
6361649 Method for the continuous cooking of chemical pulp Mar. 26, 2002
6340410 Method for delivering a variable flow of hydrogen peroxide to a bleaching vessel Jan. 22, 2002
6245196 Method and apparatus for pulp yield enhancement Jun. 12, 2001
6238517 Method for controlling oxygen delignification of pulp May. 29, 2001
6174409 Method to improve final bleached pulp strength properties by adjusting the CI02:03 ration within a single (D/Z) stage of the bleaching process Jan. 16, 2001
6153050 Method and system for controlling the addition of bleaching reagents to obtain a substantially constant percentage of pulp delignification across the first bleaching/delignifying stage Nov. 28, 2000
6123807 Method for the continuous cooking of pulp Sep. 26, 2000
6054019 Impregnation of fiber material in two subsequent concurrent impregnation zones Apr. 25, 2000
5985097 Method for suppressing undesired effects of transition and alkaline metal compounds during bleaching Nov. 16, 1999
5958181 Continuous cooking with a two-stage cool impregnation Sep. 28, 1999
5820830 Waste recovery and utilization in the kraft recovery process Oct. 13, 1998
5820729 Device and process for dissolving smelt from recovery boilers Oct. 13, 1998
5688367 Method of monitoring and recovering oxygen-rich gas from ozone bleaching Nov. 18, 1997
5674359 Continuous cooking of cellulosic fibrous material with cold alkali impregnation Oct. 7, 1997
5632859 Intergral pulp mill and method of constructing an integral mill May. 27, 1997
5582684 Method of determining degree of reduction in a sulfate liquor using IR and UV spectroscopy Dec. 10, 1996
5567274 Method of controlling pressurized ozone to a pulp delignification reactor Oct. 22, 1996
5456799 Method for controlling activation of lignocellulosic material in the presence of a nitrate containing liquid Oct. 10, 1995
5403441 Method for controlling an ozone bleaching process Apr. 4, 1995
5364505 Pressurized ozone pulp delignification reactor and a compressor for supplying ozone to the reactor Nov. 15, 1994
5306391 Control of chemical dosage to a pulp slurry Apr. 26, 1994
5282931 Determination and control of effective alkali in kraft liquors by IR spectroscopy Feb. 1, 1994
5207870 Process and equipment for pretreatment of cellulosic raw material May. 4, 1993
5203964 Process for producing cellulose from lignin containing raw materials using an enzyme or microorganism while monitoring and maintaining the redox potential Apr. 20, 1993
5192396 Process for the continuous digestion of cellulosic fiber material Mar. 9, 1993
5108655 Foam monitoring control system Apr. 28, 1992
5080755 Process for the continuous digestion of cellulosic fiber material Jan. 14, 1992
5066362 Extended delignification in pressure diffusers Nov. 19, 1991
5032223 Procedure for determining and controlling the composition proportions of wood chip mixes in alkaline pulp digestion processes Jul. 16, 1991
4952276 Method for measuring the bleaching content of pulp bleaching liquor using a chemiluminescent reagent Aug. 28, 1990
4895618 Method of controlling alkaline pulping process Jan. 23, 1990
4878998 Method for controlling peroxide bleaching in a plurality of bleaching stages Nov. 7, 1989
4849052 Batch digester multi-stage pulping process Jul. 18, 1989
4840703 Method for controlling an oxygen bleaching Jun. 20, 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
4735684 Multistage pulp bleaching control process Apr. 5, 1988
4601787 Method of bringing a digester up to cooking temperature Jul. 22, 1986
4595455 Method for controlling batch alkaline pulp digestion in combination with continuous alkaline oxygen delignification Jun. 17, 1986
4536253 Process for controlling the properties of white liquor Aug. 20, 1985
4498955 Control of active alkali in black liquor Feb. 12, 1985
4451331 Process and apparatus for producing pulp May. 29, 1984
4419184 Method for control of chemicals during gas treatment of suspensions Dec. 6, 1983
4345913 Method and apparatus for determining the lignin content in pulp Aug. 24, 1982
4220498 Oxygen reactor systems pulp reject treatment Sep. 2, 1980

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