 |
|
 |
| |
 |
|
Class Information
Number: 162/89
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 > Alkali metal, ammonium, alkaline earth metal or magnesium hydroxide or carbonate in at least one stage
Description: Processes in which a hydroxide or carbonate of an alkali metal, ammonium, an alkaline earth metal or magnesium is employed in at least one of the separate treatments.
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 |
| 7267744 |
Pulp treatment and process |
Sep. 11, 2007 |
| 7077931 |
Method and bleaching line with a main conduit for wash liquor |
Jul. 18, 2006 |
| 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 |
| 6569284 |
Elemental-chlorine-free bleaching process having an initial Eo or Eop stage |
May. 27, 2003 |
| 6375797 |
Bleaching chemical pulp in a PkDQ-Po Sequence |
Apr. 23, 2002 |
| 6315863 |
Chlorine dioxide pulp bleaching process having reduced barium scaling by recycling post-chlorination waste filtrate |
Nov. 13, 2001 |
| 6258208 |
Method for complex treatment of pulp in conjunction with a chlorine dioxide stage |
Jul. 10, 2001 |
| 6235153 |
Method of producing a bleached pulp with chlorine dioxide under a pressure created by a compressed gas containing oxygen |
May. 22, 2001 |
| 6235154 |
Chlorine dioxide bleaching in the presence of an aldehyde |
May. 22, 2001 |
| 6228213 |
Production of microcrystalline cellulose by reactive extrusion |
May. 8, 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 |
| 6153051 |
Method of bleaching kraft pulp employing chlorine dioxide/chlorine-ozone bleach sequence |
Nov. 28, 2000 |
| 6123809 |
Method for bleaching paper pulp |
Sep. 26, 2000 |
| 6056853 |
Process for peroxide bleaching of pulp using MgO particles |
May. 2, 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 |
| 5876561 |
Post digestion treatment of cellulosic pulp to minimize formation of dioxin |
Mar. 2, 1999 |
| 5853535 |
Process for manufacturing bleached pulp including recycling |
Dec. 29, 1998 |
| 5792316 |
Bleaching process for kraft pulp employing high consistency chlorinated pulp treated with gaseous chlorine and ozone |
Aug. 11, 1998 |
| 5770011 |
Neutral monoperoxysulfate bleaching process |
Jun. 23, 1998 |
| 5728264 |
Avoidance of salt scaling by acidic pulp washing process |
Mar. 17, 1998 |
| 5698075 |
Process for bleaching a chemical paper pulp in an oxygen-peroxymonosulfuric acid-hydrogen peroxide sequence |
Dec. 16, 1997 |
| 5662773 |
Process for preparation of cellulose acetate filters for use in paper making |
Sep. 2, 1997 |
| 5645687 |
Process for manufacturing bleached pulp with reduced chloride production |
Jul. 8, 1997 |
| 5589031 |
Chlorine dioxide bleaching of chemical pulp |
Dec. 31, 1996 |
| 5411635 |
Ozone/peroxymonosulfate process for delignifying a lignocellulosic material |
May. 2, 1995 |
| 5389201 |
Bleaching of kraft cellulosic pulp employing ozone and reduced consumption of chlorine containing bleaching agent |
Feb. 14, 1995 |
| 5352332 |
Process for recycling bleach plant filtrate |
Oct. 4, 1994 |
| 5346588 |
Process for the chlorine-free bleaching of cellulosic materials with ozone |
Sep. 13, 1994 |
| 5296099 |
Environmentally improved process for bleaching lignocellulosic materials with oxygen, ozone and chlorine dioxide |
Mar. 22, 1994 |
| 5268075 |
High efficiency two-step, high-low pH chlorine dioxide pulp bleaching process |
Dec. 7, 1993 |
| 5234544 |
Cleaning and bleaching of secondary fiber |
Aug. 10, 1993 |
| 5211811 |
Process for high consistency oxygen delignification of alkaline treated pulp followed by ozone delignification |
May. 18, 1993 |
| 5188708 |
Process for high consistency oxygen delignification followed by ozone relignification |
Feb. 23, 1993 |
| 5164043 |
Environmentally improved process for bleaching lignocellulosic materials with ozone |
Nov. 17, 1992 |
| 5126009 |
Process for decreasing the charge of chemical required in a chlorine bleaching extraction stage |
Jun. 30, 1992 |
| 5085734 |
Methods of high consistency oxygen delignification using a low consistency alkali pretreatment |
Feb. 4, 1992 |
| 5073301 |
Process for stabilization of the viscosity of wood pulps |
Dec. 17, 1991 |
| 5030324 |
Sequential bleaching procedure using chlorine and chlorine dioxide in a first chlorination stage of a multistage bleaching process |
Jul. 9, 1991 |
| 4999085 |
Method for screening of defibered chlorine dioxide bleached pulp during alkaline extraction |
Mar. 12, 1991 |
| 4966650 |
Method for fractionation of lignins from steam exploded lignocellulosics to provide fractions with different properties |
Oct. 30, 1990 |
| 4959124 |
Method of bleaching kraft pulp in a DZED sequence |
Sep. 25, 1990 |
| 4956048 |
Method of alcohol washing brownstock pulp prior to a chlorination bleaching stage |
Sep. 11, 1990 |
| 4908099 |
Process to dissociate and extract the Lignin and the Xylan from the primary wall and middle lamella or lignocellulosic material which retains the structural integrity of the fibre core |
Mar. 13, 1990 |
| 4902381 |
Method of bleaching pulp with ozone-chlorine mixtures |
Feb. 20, 1990 |
| 4812206 |
Process for bleaching lignocellulosic matter |
Mar. 14, 1989 |
| 4806203 |
Method for alkaline delignification of lignocellulosic fibrous material at a consistency which is raised during reaction |
Feb. 21, 1989 |
|
|
|
 |
|
 |
|
| |
Randomly Featured Patents |
|
