| Patents for D21C 11 - Regeneration of pulp liquors (4,054) |
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| 03/26/1999 | CA2248402A1 Methods of improving productivity of black liquor recovery boilers |
| 03/25/1999 | WO1999014423A1 Polysulfide pulping process |
| 03/24/1999 | EP0903436A2 Method in connection with impregnation and digestion of lignocellulosic material |
| 03/17/1999 | EP0902123A2 Process for preparing coated printing paper |
| 03/10/1999 | EP0687323B1 Zero discharge mill distillation, salt recovery, and water management |
| 03/10/1999 | CN1210093A Closed circulation treatment of waste water and gases in papermaking plants |
| 03/09/1999 | US5879511 Recovery boiler operation with black liquor feed in separate liquid stream and solid stream |
| 03/09/1999 | US5879422 Separating arrangement and method for counteracting foam formation |
| 03/04/1999 | WO1999010595A1 Method for the recovery of formic acid |
| 03/03/1999 | EP0799086B1 Electromembrane processes for the treatment of kraft mill electrostatic precipitator catch |
| 03/03/1999 | CN1042359C Process for extracting coarse-grain pure silicic acid crystals |
| 03/02/1999 | US5876594 Turbo oxidation system,--TOS, for wet combustion of COD-containing liquids and for COD-reduction by enzymes |
| 02/24/1999 | EP0897432A1 Method and plant for separating soap from black liquor |
| 02/17/1999 | EP0896648A1 Hydrogen sulphide pretreatment of lignocellulosic material in continuous pulping processes |
| 02/17/1999 | CN1042156C Process for partial combustion of cellulose spent liquor |
| 02/11/1999 | CA2245273A1 Method for compacting and selective leaching of fly ash from a recovery boiler using a pressure filter |
| 02/10/1999 | CN1207782A Process for preparing pulp-cooking solution |
| 02/10/1999 | CN1207429A Process for synthesis of heavy oil (diesel oil) with papermaking waste liquor and treatment of such liquor |
| 02/09/1999 | US5868805 Process for integrated evaporation and gasification of spent liquor from cellulose cooking |
| 02/03/1999 | CN1206762A Dissolved solids control in pulp production |
| 02/02/1999 | US5865948 Oxygen-free solvent pulping |
| 01/28/1999 | WO1999004088A1 Method of oxidizing white and black liquor |
| 01/27/1999 | EP0739434B1 Improved process for recycling bleach plant filtrate |
| 01/21/1999 | WO1999002771A1 Method for the treatment of spent liquor from kraft pulp production |
| 01/20/1999 | EP0815316B1 High solids black liquor of reduced viscosity and viscosity reduction method for high solids black liquor |
| 01/14/1999 | WO1999001612A1 Method for minimizing water use in a water circuit in a paper, cellulose or wood factory |
| 01/13/1999 | CN2303867Y Hollow spiral-extrusion vacuum pumping-filtering device |
| 01/13/1999 | CN1204712A Pulp washing screening technology of black liquor extraction rate achieved 95% and basically no washing waste water discharging |
| 01/12/1999 | CA2049941C Electrodialytic water splitting process for the treatment of aqueous electrolytes |
| 01/07/1999 | EP0888476A1 Process for extracting chemicals and energy from cellulose spent liquor |
| 01/05/1999 | US5855737 Process for regenerating a liquid created in the kraft process for pulping wood, while simultaneously obtaining high energy efficiency |
| 01/05/1999 | US5855736 Method of reducing corrosion in a power boiler of a pulp mill |
| 12/30/1998 | EP0791103A4 Method of papermaking having zero liquid discharge |
| 12/30/1998 | EP0642610B1 Treatment of bleach plant effluents |
| 12/30/1998 | CN1203297A Technique for recovering papermaking black liquor alkali |
| 12/30/1998 | CN1203296A Straw pulp papermaking waste water loop circulation process and equipment |
| 12/30/1998 | CN1041450C Method for treating paper-making black liquor |
| 12/29/1998 | US5853535 Process for manufacturing bleached pulp including recycling |
| 12/23/1998 | EP0593744B1 Process for the recovery of processing chemicals from the black liquor in the production of cellulose by organo-solvent processes |
| 12/23/1998 | CN2301471Y Direct black liquor evaporizing and jet burning device for small paper mill |
| 12/15/1998 | US5849197 Regeneration of pulp liquors |
| 12/15/1998 | US5849151 Continuous digester having means for implementing low dissolved solids profiling |
| 12/15/1998 | US5849150 Low dissolved solids control in pulp production |
| 12/10/1998 | WO1998055685A1 System and method for paper mill sulfur recovery and odor control |
| 12/09/1998 | EP0719359B1 Minimum adverse environmental impact pulp mill |
| 12/03/1998 | WO1998054400A1 Process for treating spent, waste, alkaline digestion liquor from paper pulping operations and product |
| 12/01/1998 | US5843316 Method of separating sodium hydroxide from white liquor or polysulfide liquor using diffusion dialysis |
| 11/25/1998 | EP0863250A4 Process for preparing a pulp-cooking solution |
| 11/25/1998 | CN1199796A Comprehensive treating and utilizing method for papermaking black liquor |
| 11/25/1998 | CN1199795A Papermaking black liquor pollution controlling method through extracting organism and recovering alkali |
| 11/24/1998 | US5840085 Process for removing sodium chloride and potassium salts from ash collected from a soda recovery boiler |
| 11/21/1998 | CA2238292A1 Method of obtaining and using particulate calcium carbonate |
| 11/19/1998 | WO1998051855A1 Method of minimizing scaling problems in the manufacture of bleached cellulose pulp while using an essentially fully closed washing liquid flow pattern |
| 11/11/1998 | CN1198786A Method for reprochessing an ozone-containing gas present in a pulp bleaching plant |
| 11/11/1998 | CN1198356A Paper industrial water-purifying circulation alkali recovery regeneration energy (universal) distillation still |
| 11/05/1998 | DE19718131A1 Regeneration of black liquor from wood digester |
| 11/04/1998 | CN1197870A Papermaking pulp-liquor separating technology and diffusion washing single cylinder vacuum filter press thereof |
| 11/04/1998 | CN1197869A Lime process treating papermaking effluent |
| 11/03/1998 | US5830314 Cleaning condensates from multi-effect evaporator of cellulose pulp waste liquors |
| 10/29/1998 | WO1998048102A1 Separating alkali metals from gasified black liquor |
| 10/28/1998 | EP0873490A1 Process for increasing the effectiveness of slag control chemicals for black liquor recovery and other combustion units |
| 10/28/1998 | EP0750697A4 Regeneration of pulp liquors |
| 10/28/1998 | CN2295782Y Lignin dewatering apparatus |
| 10/21/1998 | EP0785815A4 Defoamer composition and method of using the same |
| 10/21/1998 | EP0748412B1 Impact of temperature and alkali charge on pulp brightness |
| 10/21/1998 | CN1196420A Method for reclaiming papermaking digesting waste liquor and equipment thereof |
| 10/20/1998 | US5824188 Method of controlling the pressure of a continuous digester using an extraction-dilution |
| 10/15/1998 | WO1998045306A1 Separating lignin solids and black liquor |
| 10/14/1998 | CN1196033A Process for treating surplus activated sludge |
| 10/13/1998 | US5822220 Process for controlling the efficiency of the causticizing process |
| 10/13/1998 | US5820729 Soda smelt dissolver; preventing or reducing the deposition of pirssonite a chemical combination of sodium carbonate and calcium carbonate by switching over the functions of different tanks |
| 10/07/1998 | EP0868563A1 Black liquor gasification process and regeneration of pulping liquor |
| 10/07/1998 | EP0868562A1 Process for the conversion of calcium sulfide |
| 10/07/1998 | CN1195382A Method of separating impurities from lime and lime sludge and method of causticizing green liquor containing impurities, such as silicon in two stages |
| 10/01/1998 | WO1998043017A1 Recovery boiler for combustion of waste liquors |
| 10/01/1998 | WO1998042912A1 Method for preparing alkaline solutions containing aromatic polymers |
| 09/29/1998 | US5814189 Method for gasifying cellulose spent liquor to produce superheated steam and green liquor of low carbonate concentration |
| 09/29/1998 | CA2005146C Lignin preparation and a method for its manufacture |
| 09/23/1998 | CN2292110Y Black Liquor treatment device for paper making |
| 09/23/1998 | CN1193671A Agent for recovering waste water and residuals for papermaking of packaging paperboard |
| 09/22/1998 | CA2141550C Aqueous suspensions of colloidal particles, preparation and use of the suspensions |
| 09/16/1998 | EP0668983B1 A furnace |
| 09/11/1998 | WO1998039258A1 Process for treating wastewater |
| 09/09/1998 | EP0863250A2 Process for preparing a pulp-cooking solution |
| 09/09/1998 | EP0863113A1 Process for treating wastewater |
| 09/08/1998 | US5803020 Recovery boiler for combustion of waste liquors |
| 09/01/1998 | US5800773 Segmented smelt spout |
| 08/26/1998 | EP0859884A1 Process for purifying condensate while evaporating waste liquors |
| 08/11/1998 | US5792315 Purifying aqueous effluent from a pulp mill using electro chemical membrane device |
| 08/05/1998 | CN1189864A Method for producing polysulfides by electrolytic oxidation |
| 08/05/1998 | CN1189557A Tech. for recovering source from pollution treatment of paper mill |
| 08/04/1998 | US5788813 Filtering dregs-containing green liquor or adding filter to existing mill |
| 08/04/1998 | US5788812 Method of recovering furfural from organic pulping liquor |
| 07/30/1998 | WO1998032915A1 A process for the separation of sulphides from pulping liquors using amphoteric resins |
| 07/29/1998 | EP0688374B1 A method of separating sulphur compounds |
| 07/21/1998 | US5783140 Method and apparatus for opening discharge outlets |
| 07/15/1998 | EP0642611B1 A process for recovering energy from a combustible gas |
| 07/15/1998 | CN1187556A Method and device for treating straw fibre papermaking pulping black liquor |
| 07/09/1998 | WO1998029598A1 Treatment of bleach plant filtrates with oxygen |
| 07/08/1998 | EP0852272A1 Recovery process in a pulp mill |