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Class Information
Number: 162/88
Name: Paper making and fiber liberation > Processes of chemical liberation, recovery or purification of natural cellulose or fibrous material > Treatment with particular chemical > Chlorine containing > Plural diverse stage treatments
Description: Processes in which the fibrous material is subjected to a plurality of separate, dissimilar chemical treatments, at least one of which involves treatment with a chlorine containing material.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7374637 |
Method of bleaching cellulose pulp with a main conduit for wash liquor and filtrate |
May. 20, 2008 |
| 7368036 |
Xylanase treatment of chemical pulp |
May. 6, 2008 |
| 7267744 |
Pulp treatment and process |
Sep. 11, 2007 |
| 7189329 |
Control of development of biofilms in industrial process water |
Mar. 13, 2007 |
| 7182835 |
Two-stage chlorine bleaching process with filtrate recirculation |
Feb. 27, 2007 |
| 6776876 |
Method of treating cellulosic pulp to remove hexenuronic acid |
Aug. 17, 2004 |
| 6773547 |
Process for the bleaching of low consistency pulp using high partial pressure ozone |
Aug. 10, 2004 |
| 6736934 |
Method of pretreating pulp in an acid tower prior to bleaching with peroxide |
May. 18, 2004 |
| 6706143 |
Minimizing chlorinated organics in pulp bleaching processes |
Mar. 16, 2004 |
| 6679972 |
Process for the bleaching of a pulp suspension by separating calcium from lignin |
Jan. 20, 2004 |
| 6660128 |
Oxidase process for pulp |
Dec. 9, 2003 |
| 6579412 |
Process for ozone bleaching of low consistency pulp |
Jun. 17, 2003 |
| 6569284 |
Elemental-chlorine-free bleaching process having an initial Eo or Eop stage |
May. 27, 2003 |
| 6540872 |
Process for chlorine dioxide bleaching using a chelating agent without an intermediate wash |
Apr. 1, 2003 |
| 6375797 |
Bleaching chemical pulp in a PkDQ-Po Sequence |
Apr. 23, 2002 |
| 6342124 |
Method of bleaching pulp with an assistant R2 -O-{(C2H4O)m/(AO)p}--(AO)q --H or (R3)t --X--{(C2H4O)m/(AO)p}--(AO)r --H |
Jan. 29, 2002 |
| 6315863 |
Chlorine dioxide pulp bleaching process having reduced barium scaling by recycling post-chlorination waste filtrate |
Nov. 13, 2001 |
| 6306253 |
Acid treatment of pulp at high temperature prior to chlorine dioxide bleaching |
Oct. 23, 2001 |
| 6258208 |
Method for complex treatment of pulp in conjunction with a chlorine dioxide stage |
Jul. 10, 2001 |
| 6248209 |
Process for bleaching cellulose pulp with a bleaching assistant having the formula R1-O-{[(C2H4O)m/(AO)n}]-H |
Jun. 19, 2001 |
| 6235153 |
Method of producing a bleached pulp with chlorine dioxide under a pressure created by a compressed gas containing oxygen |
May. 22, 2001 |
| 6221209 |
Multi-stage bleaching process having a final stabilized peroxide stage |
Apr. 24, 2001 |
| 6174412 |
Cotton linter tissue products and method for preparing same |
Jan. 16, 2001 |
| 6126782 |
Method for non-chlorine bleaching of cellulose pulp with a totally closed counter-current liquid circuit |
Oct. 3, 2000 |
| 6123809 |
Method for bleaching paper pulp |
Sep. 26, 2000 |
| 6048437 |
Process for bleaching chemical pulp with chlorine dioxide, peroxide and Na.sub.2 M.sub.0 O.sub.4 as reaction catalyt |
Apr. 11, 2000 |
| 6042690 |
Method for the bleaching of pulp in a D2D sequence wherein the effluent contains reduced colored matter |
Mar. 28, 2000 |
| 5938892 |
Process for recycling bleach plant filtrate |
Aug. 17, 1999 |
| 5853535 |
Process for manufacturing bleached pulp including recycling |
Dec. 29, 1998 |
| 5853536 |
Method for ozone bleaching of cellulosic pulp at low consistency |
Dec. 29, 1998 |
| 5785811 |
Process for treating lignocellulosic material with soybean peroxidase in the presence of peroxide |
Jul. 28, 1998 |
| 5662773 |
Process for preparation of cellulose acetate filters for use in paper making |
Sep. 2, 1997 |
| 5607545 |
Ozone bleaching process utilizing a fluidizing mixer and super-atmospheric pressure |
Mar. 4, 1997 |
| 5591304 |
Method for the use of enzymes in bleaching paper pulp |
Jan. 7, 1997 |
| 5589031 |
Chlorine dioxide bleaching of chemical pulp |
Dec. 31, 1996 |
| 5246543 |
Process for bleaching and delignification of lignocellulosic materials |
Sep. 21, 1993 |
| 5164043 |
Environmentally improved process for bleaching lignocellulosic materials with ozone |
Nov. 17, 1992 |
| 5143580 |
Process for reducing the amount of halogenated organic compounds in spent liquor from a peroxide-halogen bleaching sequence |
Sep. 1, 1992 |
| 5139613 |
Process for preparing a paper pulp using carbon dioxide as an acidifying agent for a bleached pulp |
Aug. 18, 1992 |
| 5030324 |
Sequential bleaching procedure using chlorine and chlorine dioxide in a first chlorination stage of a multistage bleaching process |
Jul. 9, 1991 |
| 4966650 |
Method for fractionation of lignins from steam exploded lignocellulosics to provide fractions with different properties |
Oct. 30, 1990 |
| 4956048 |
Method of alcohol washing brownstock pulp prior to a chlorination bleaching stage |
Sep. 11, 1990 |
| 4944842 |
Method for reducing contamination in pulp processing |
Jul. 31, 1990 |
| 4902381 |
Method of bleaching pulp with ozone-chlorine mixtures |
Feb. 20, 1990 |
| 4869783 |
High-yield chemical pulping |
Sep. 26, 1989 |
| 4842690 |
Mixing chlorine gas into paper pulp slurries |
Jun. 27, 1989 |
| 4729817 |
Process for the oxidative delignification of demethylated chemical pulp |
Mar. 8, 1988 |
| 4661205 |
Method of bleaching lignocellulosic material with peroxide catalyzed with a salt of a metal |
Apr. 28, 1987 |
| 4579628 |
Process for chlorine bleaching of kraft pulp using a sulfite extraction stage |
Apr. 1, 1986 |
| 4537656 |
Method for delignifying or bleaching cellulose pulp wherein chlorine is added to recycle liquor to regenerate chlorine dioxide |
Aug. 27, 1985 |
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