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Class Information
Number: 162/30.1
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 > With destruction of organic ingredient in or smelting of liquor
Description: Processes which include (a) the destruction of the organic constituent of the waste liquor, or (b) treatment of the product of such destruction to produce a chemical composition for further use in a cellulose digestion process.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7575657 |
Method and apparatus for reducing the amount of sludge produced in a pulp and/or paper mill |
Aug. 18, 2009 |
| 7553394 |
Method for removing potassium from ash produced in a kraft pulping process recovery boiler using a Na-type cation exchange organic resin |
Jun. 30, 2009 |
| 7501042 |
Method and arrangement in connection with a chemical recovery boiler |
Mar. 10, 2009 |
| 7465372 |
Method for treatment of spent liquor |
Dec. 16, 2008 |
| 7351306 |
Cooking of cellulose pulp in a cooking liquor containing pre-evaporated black liquor |
Apr. 1, 2008 |
| 7294225 |
Process for production of synthesis gas in combination with the maintenance of the energy balance for a pulp mill |
Nov. 13, 2007 |
| 7291245 |
Process for causticizing green liquor in chemical recovery from black liquor in alkaline pulping |
Nov. 6, 2007 |
| 7231714 |
Corrosion-resistant exterior alloy for composite tubes |
Jun. 19, 2007 |
| 7097738 |
Process for producing pulp |
Aug. 29, 2006 |
| 6946057 |
Alkaline process for the manufacturing of pulp using alkali metaborate as buffering alkali |
Sep. 20, 2005 |
| 6799526 |
Methods of improving productivity of black liquor recovery boilers |
Oct. 5, 2004 |
| 6790313 |
Method of cleaning sulfide contaminated condensates |
Sep. 14, 2004 |
| 6770168 |
Process for oxygen pulping of lignocellulosic material and recorvery of pulping chemicals |
Aug. 3, 2004 |
| 6761799 |
Method and arrangement for combusting black liquor |
Jul. 13, 2004 |
| 6578529 |
Arrangement for feeding black liquor into a recovery boiler |
Jun. 17, 2003 |
| 6503369 |
Process for producing cellulose and fertilizer by-product |
Jan. 7, 2003 |
| 6500301 |
Apparatus for gasification of spent liquor |
Dec. 31, 2002 |
| 6425976 |
Method for black liquor gasification in recovery boilers |
Jul. 30, 2002 |
| 6425974 |
Process for treating wastewater from a bleach plant |
Jul. 30, 2002 |
| 6348129 |
Treatment of pulp mill condensate with ozone |
Feb. 19, 2002 |
| 6336994 |
Totally chlorine free bleaching process using recovered filtrate |
Jan. 8, 2002 |
| 6319358 |
Electrolytic causticizing of smelt from a kraft recovery furnace |
Nov. 20, 2001 |
| 6294048 |
Method for regenerating sodium hydroxide by partial autocausticizing sodium carbonate containing smelt by reaction with a borate |
Sep. 25, 2001 |
| 6287415 |
Arrangement in soda recovery boiler for removing melts for maintenance |
Sep. 11, 2001 |
| 6261411 |
Process for kraft chemical recovery |
Jul. 17, 2001 |
| 6228214 |
Method for black liquor gasification in recovery boilers |
May. 8, 2001 |
| 6183598 |
Process for recovering alkali and black liquor containing silicatae |
Feb. 6, 2001 |
| 6162408 |
Process for purifying ash which principally consists of sodium sulphate from a recovery boiler |
Dec. 19, 2000 |
| 6143130 |
Polysulfide pulping process |
Nov. 7, 2000 |
| 6126782 |
Method for non-chlorine bleaching of cellulose pulp with a totally closed counter-current liquid circuit |
Oct. 3, 2000 |
| 6126781 |
Process for conditioning ozone gas recycle stream in ozone pulp bleaching |
Oct. 3, 2000 |
| 6113739 |
Process for washing gas formed by gasifying black liquor |
Sep. 5, 2000 |
| 6074521 |
Method of separating impurities from lime and lime sludge |
Jun. 13, 2000 |
| 6062547 |
Quench vessel for recovering chemicals and energy from spent liquors |
May. 16, 2000 |
| 6063237 |
Treatment of solid containing material derived from effluent or waste from wastepaper treating process |
May. 16, 2000 |
| 6039837 |
Method of bleaching pulp with ozone wherein the acidity is maintained with an acid solution prepared by electrolysis or electrodialysis |
Mar. 21, 2000 |
| 6030493 |
Process for recovering chemicals and energy from cellulose spent liquor using multiple gasifiers |
Feb. 29, 2000 |
| 6027609 |
Pulp-mill recovery installation for recovering chemicals and energy from cellulose spent liquor using multiple gasifiers |
Feb. 22, 2000 |
| 6024833 |
Process for removing metals and recovering a chelating agent from a bleach plant waste liquor |
Feb. 15, 2000 |
| 5993601 |
Process for producing polysulphide by means of oxidizing sulphide in spent liquors from kraft cellulose cooking |
Nov. 30, 1999 |
| 5984987 |
Black liquor gasification process |
Nov. 16, 1999 |
| 5976319 |
Disrupting the flow from the smelt spout of a recovery boiler |
Nov. 2, 1999 |
| 5938892 |
Process for recycling bleach plant filtrate |
Aug. 17, 1999 |
| 5922172 |
Combustion of black liquid and processing of lime sludge in a recovery boiler |
Jul. 13, 1999 |
| 5879511 |
Recovery boiler operation with black liquor feed in separate liquid stream and solid stream |
Mar. 9, 1999 |
| 5853535 |
Process for manufacturing bleached pulp including recycling |
Dec. 29, 1998 |
| 5824275 |
Secondary and tertiary air nozzle for furnace apparatus |
Oct. 20, 1998 |
| 5820729 |
Device and process for dissolving smelt from recovery boilers |
Oct. 13, 1998 |
| 5814189 |
Method for gasifying cellulose spent liquor to produce superheated steam and green liquor of low carbonate concentration |
Sep. 29, 1998 |
| 5759345 |
Process for treating sulphur-containing spent liquor using multi-stage carbonization |
Jun. 2, 1998 |
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