| Patents for D21C 11 - Regeneration of pulp liquors (4,054) |
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| 11/05/1997 | CN1163863A Technique for recovering, treating and closed-loop circulation of papermaking waste water |
| 11/04/1997 | US5683590 Treatment of waste paper |
| 11/04/1997 | US5683550 Method and apparatus for increasing recovery boiler capacity by withdrawing combustible gas from the furnace |
| 11/04/1997 | US5683549 Process for the partial combustion of cellulose spent liquor using twin fluid nozzle burner |
| 10/29/1997 | EP0803008A1 Method of precipitating transition metals and alkaline earth metals from bleach plant effluents |
| 10/28/1997 | US5681427 Apparatus for treating pulp produced by solvent pulping |
| 10/22/1997 | CN1162664A Method for both pulp producing and papermaking |
| 10/16/1997 | WO1997037944A1 Method for oxidation of waste liquors containing organic matter |
| 10/14/1997 | US5676797 Apparatus for removing high-volume, low concentration non-condensable gases produced in a kraft pulping process |
| 10/08/1997 | EP0799086A1 Electromembrane processes for the treatment of kraft mill electrostatic precipitator catch |
| 10/08/1997 | CN1161392A Method of heat treating black liquor |
| 10/02/1997 | WO1997036043A1 Process for extracting chemicals and energy from cellulose spent liquor |
| 10/02/1997 | CA2247815A1 Process for extracting chemicals and energy from cellulose spent liquor |
| 09/30/1997 | US5672246 Waste liquid from cellulose pulp process is used in recovery boiler |
| 09/25/1997 | WO1997035063A1 Methanol recovery using extractive distillation |
| 09/24/1997 | CN1035959C Process for partial combustion of cellulose spent |
| 09/23/1997 | US5670020 Foam separation method for reducing AOX, COD, and color bodies of kraft pulp bleach plant effluents |
| 09/23/1997 | US5669948 Separating arrangement and method for counteracting foam formation |
| 09/17/1997 | EP0693145B1 Process for converting sodium sulphate |
| 09/16/1997 | US5667668 Electrolysis process for removal of caustic in hemicellulose caustic |
| 09/16/1997 | US5667633 Method of producing white liquor streams of high and low sulphidity |
| 09/16/1997 | US5667201 Smelt spout for a recovery furance |
| 09/10/1997 | EP0680531B1 Method for the recovery of energy and chemicals from cellulose spent liquors |
| 09/03/1997 | EP0792395A1 Method to regenerate gas mixture in ozone-bleaching process |
| 09/03/1997 | EP0792394A1 Black liquor impregnation in single-vessel hydraulic digester |
| 09/02/1997 | US5662775 Countercurrent cooking zone at first level and extraction screen at second level |
| 09/02/1997 | US5662774 Pulping wood in a cooking liquid, evaporation of water in multistage reaction |
| 08/27/1997 | EP0791103A1 Method of papermaking having zero liquid discharge |
| 08/27/1997 | EP0791101A1 Odour treatment of malodorous condensates with ozone-containing residual gas |
| 08/26/1997 | US5660686 Cooking with spent liquor pretreatment of cellulose material |
| 08/26/1997 | US5660685 Decomposing spent liquors from cellulose, extracting combustible gases, dissolving sulfides, recovering, recirculating hydrogen sulfide |
| 08/26/1997 | CA2096341C Continuous soap skimmer |
| 08/19/1997 | CA2103664C Method of recovering energy and chemicals from black liquor |
| 08/14/1997 | WO1997019220A3 Process for preparing a pulp-cooking solution |
| 08/06/1997 | EP0787232A1 Process for the final evaporation of black liquor |
| 08/05/1997 | US5653861 For producing pulps |
| 07/30/1997 | EP0785815A1 Defoamer composition and method of using the same |
| 07/26/1997 | CA2195993A1 Procedure for the burning of black liquor in a recovery boiler |
| 07/23/1997 | EP0784721A1 A method for treating acid and alkaline waste streams from a bleach plant separately |
| 07/23/1997 | EP0736119B1 Process for extracting pure, coarse grain silicic acid crystals |
| 07/23/1997 | EP0715608B1 Method of incinerating sludge resulting from waste-water treatment |
| 07/16/1997 | EP0783359A1 Liquid distributor for an evaporator |
| 07/16/1997 | EP0670001B1 Method and apparatus for improving the safety of a spent liquor recovery boiler |
| 07/16/1997 | EP0584161B1 White liquor preparation and pulping process |
| 07/15/1997 | US5647955 Method of reducing scaling of heat transfer surfaces in an evaporation plant of a sulphate cellulose mill |
| 07/09/1997 | CN1153843A Alkali process for treating black liquor |
| 07/08/1997 | US5645762 Defoamer composition and method of using the same |
| 07/08/1997 | US5645616 Black liquor gasifier |
| 07/08/1997 | US5644996 Cooling medium is injected immediately above fluidized bed |
| 07/03/1997 | WO1997023687A1 Black liquor gasification process and regeneration of pulping liquor |
| 07/03/1997 | WO1997023686A1 Process for the conversion of calcium sulfide |
| 07/03/1997 | WO1997023283A1 Pyrolytic and/or thermochemical conversion reactions and apparatus therefor |
| 07/03/1997 | CA2241138A1 Process for the conversion of calcium sulfide |
| 07/03/1997 | CA2240993A1 Black liquor gasification process and regeneration of pulping liquor |
| 07/01/1997 | US5643410 Batch process for preparing kraft pulp in a batch digesting process |
| 07/01/1997 | CA2108202C Reducing pulp mill liquid discharge |
| 06/26/1997 | WO1997022752A1 Process for filtering white liquor and a storage container for lime sludge |
| 06/19/1997 | WO1997021869A1 PROCESS FOR OBTAINING FLUE GASES WITH LOW CONTENT OF NOx WHILE COMBUSTING BLACK LIQUOR AND A RECOVERY BOILER THEREFOR |
| 06/18/1997 | EP0639163B1 Turbo oxidation system (tos) for "wet combustion" of cod-containing liquids and for cod-reduction by enzymes |
| 06/17/1997 | US5639347 Method of controlling of metals in a bleach plant, using oxidation |
| 06/10/1997 | US5637225 Method for fractionating sulphite cooking liquor |
| 06/10/1997 | US5637192 Endothermic spent liquor recovery process |
| 06/05/1997 | WO1997019891A1 Novel catalyst for the oxidation of sulfides |
| 06/04/1997 | EP0776394A1 Enhancements in pulping with dissolved solids control |
| 06/03/1997 | US5635095 Inserting elongated heating element into drainage spout, shut down of furnace to cool and solidify melt in spout and fix heater in desired position, then start up heats and melts blockage to open drain |
| 06/03/1997 | US5635027 Adding thiocyanate, perchlorate, iodide, bromide, or nitrate salt to black liquor prior to oxidizing and causticizing to form white liquor reusable for wood pulp digestion |
| 06/03/1997 | US5635024 Mixing with water, water soluble surfactant and polymeric coagulant, then acidification to cause coagulation and flocculation of organic compounds |
| 06/03/1997 | US5634950 Black liquor gasifier |
| 05/28/1997 | EP0721525A4 DESCALING BY REGULATING pH AND SALT CONCENTRATION |
| 05/13/1997 | US5628875 Method for clarifying green liquor by monitoring the calcium concentration in the spent liquor prior to or at combustions |
| 05/13/1997 | US5628874 Reduction of chloride in pulping chemical recovery systems |
| 05/13/1997 | US5628872 Method for bleaching pulp with hydrogen peroxide recovered from cellulosic spent liquor |
| 05/09/1997 | WO1997016592A1 Process for purifying condensate while evaporating waste liquors |
| 05/09/1997 | WO1997016380A1 Removal of caustic in hemicellulose caustic |
| 05/06/1997 | US5626717 Reducing adsorbable organic halides, oxygen demand, color bodies, and toxicity by contacting with peroxy compound in catalyst presence |
| 05/02/1997 | EP0705363B1 Method of firing black liquor in recovery boilers and a recovery boiler for firing black liquor |
| 04/29/1997 | US5624545 Production of polysulphide by electrolysis of white liquor containing sulphide |
| 04/29/1997 | US5624531 Evaporator operating on falling film principle |
| 04/29/1997 | US5624470 Black liquor gasification with integrated warm-up and purge |
| 04/16/1997 | EP0656966B1 Method of treating process water |
| 04/16/1997 | CN1147483A Leaching process |
| 04/15/1997 | US5620562 Continuous digestion of kraft pulp while maintaining low concentrations of dissolved organic materials yields increased strength and bleachability |
| 04/09/1997 | CN1147042A Straw digesting pulp-making process, method and system for recovery of waste wash liquor thereof |
| 04/01/1997 | US5616214 In situ |
| 04/01/1997 | CA2040867C Reduction of halogenated organic compounds in spent bleach liquor |
| 03/29/1997 | WO1997019220A2 Process for preparing a pulp-cooking solution |
| 03/29/1997 | CA2238100A1 Process for preparing a pulp-cooking solution |
| 03/25/1997 | CA1339018C Indirectly heated thermochemical reactor apparatus and processes |
| 03/20/1997 | WO1997010501A1 Determination of sodium sulfide and sulfidity in green liquors and smelt solutions |
| 03/19/1997 | EP0763622A2 Continuous solvent pulping and washing processes and apparatus |
| 03/19/1997 | EP0656871B1 Aqueous suspensions of colloidal particles, preparation and use of the suspensions |
| 03/12/1997 | EP0761871A1 Kraft recovery boiler furnace |
| 03/12/1997 | EP0639097B1 Distillation apparatus |
| 03/12/1997 | EP0623046B1 Separation device and process |
| 03/12/1997 | EP0618846B1 Separating arrangement and method for counteracting foam formation |
| 03/12/1997 | CN1144781A Harnessing method for papermaking waste water |
| 03/12/1997 | CA2184875A1 Combustion system for a black liquor recovery boiler |
| 03/06/1997 | WO1997007867A1 Liquid distributor for evaporator |
| 03/06/1997 | CA2229486A1 Liquid distributor for evaporator |
| 03/04/1997 | US5607552 Silica-based anionic particles, smectite |