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Class Information
Number: 162/38
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
Description: Processes which include the addition of chemicals other than water or steam, to waste liquor, prior to reuse thereof.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7445691 |
Impregnation of chips with an acid liquid prior to a sulphate pulping process |
Nov. 4, 2008 |
| 7303649 |
Removal of inorganic elements from wood chips |
Dec. 4, 2007 |
| 6955743 |
Method for producing furfural, acetic acid and formic acid from spent pulp-cooking liquor |
Oct. 18, 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 |
| 6663749 |
Method for regenerating sodium hydroxide by partial autocausticizing sodium carbonate containing smelt by reaction with borate |
Dec. 16, 2003 |
| 6562191 |
Process for producing pulp with a mixture of formic acid and acetic acid as cooking chemical |
May. 13, 2003 |
| 6544384 |
Pretreatment of chips before cooking |
Apr. 8, 2003 |
| 6468390 |
Method for continuous cooking of lignocellulosic fiber material |
Oct. 22, 2002 |
| 6348128 |
Method of increasing the causticizing efficiency of alkaline pulping liquor by borate addition |
Feb. 19, 2002 |
| 6315861 |
Process for conditioning ozone gas recycle stream in ozone pulp bleaching |
Nov. 13, 2001 |
| 6294048 |
Method for regenerating sodium hydroxide by partial autocausticizing sodium carbonate containing smelt by reaction with a borate |
Sep. 25, 2001 |
| 6261413 |
Continuously guiding liquids in a digester during pulp digestion |
Jul. 17, 2001 |
| 6210527 |
Pulp bleaching method wherein an ozone bleaching waste stream is scrubbed to form an oxygen containing stream |
Apr. 3, 2001 |
| 5993601 |
Process for producing polysulphide by means of oxidizing sulphide in spent liquors from kraft cellulose cooking |
Nov. 30, 1999 |
| 5944951 |
Method for reusing spent gas from an ozone bleaching reactor |
Aug. 31, 1999 |
| 5938892 |
Process for recycling bleach plant filtrate |
Aug. 17, 1999 |
| 5853535 |
Process for manufacturing bleached pulp including recycling |
Dec. 29, 1998 |
| 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 |
| 5688367 |
Method of monitoring and recovering oxygen-rich gas from ozone bleaching |
Nov. 18, 1997 |
| 5676795 |
Process for the production of viscose pulp |
Oct. 14, 1997 |
| 5645728 |
Hydrogen peroxide recovery from colored aqueous solutions |
Jul. 8, 1997 |
| 5639347 |
Method of controlling of metals in a bleach plant, using oxidation |
Jun. 17, 1997 |
| 5635026 |
Cooking cellulose material with high alkali concentrations and/or high pH |
Jun. 3, 1997 |
| 5562830 |
Calcium carbonate scale controlling method |
Oct. 8, 1996 |
| 5509999 |
Treatment of bleach plant effluents |
Apr. 23, 1996 |
| 5472567 |
Method of chemically reacting a slurry with a gas |
Dec. 5, 1995 |
| 5468393 |
Methods of controlling scale formation in the presence of metal ions in aqueous systems |
Nov. 21, 1995 |
| 5407583 |
Controlling scale in black liquor evaporators |
Apr. 18, 1995 |
| 5405497 |
Method of chemically reacting a liquid with a gas in a vortex |
Apr. 11, 1995 |
| 5403441 |
Method for controlling an ozone bleaching process |
Apr. 4, 1995 |
| 5401362 |
Control of metals and dissolved organics in the bleach plant |
Mar. 28, 1995 |
| 5368740 |
Methods of controlling scale formation in the presence of metal ions in aqueous systems |
Nov. 29, 1994 |
| 5352332 |
Process for recycling bleach plant filtrate |
Oct. 4, 1994 |
| 5328564 |
Modified digestion of paper pulp followed by ozone bleaching |
Jul. 12, 1994 |
| 5246542 |
Evaporation and recovery process for bleached chemical thermo-mechanical pulp (BCTMP) effluent |
Sep. 21, 1993 |
| 5174860 |
Low temperature recovery of kraft black liquor |
Dec. 29, 1992 |
| 5127992 |
Elimination of bleach effluents |
Jul. 7, 1992 |
| 5082526 |
Process of producing kraft pulping liquor by the oxidation of white liquor in the presence of lime mud |
Jan. 21, 1992 |
| 5034094 |
Method of converting inorganic materials from kraft pulping liquor into pulping chemicals without passing them through a recovery furnace |
Jul. 23, 1991 |
| 5013454 |
Method of removing organic substances from effluents from pulp and paper manufacturing processes |
May. 7, 1991 |
| 4915830 |
Pulp wash press |
Apr. 10, 1990 |
| 4853082 |
Process for the activation and delignification of cellulose pulp |
Aug. 1, 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 |
| 4725335 |
Process for producing nitrogen oxides from aqueous waste cellulose pulp liquor containing nitrogen compounds |
Feb. 16, 1988 |
| 4595455 |
Method for controlling batch alkaline pulp digestion in combination with continuous alkaline oxygen delignification |
Jun. 17, 1986 |
| 4574032 |
Process for delignification of lignocellulosic material in the presence of anthraquinone in solution with white and black liquors |
Mar. 4, 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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