| Patents for D21C 11 - Regeneration of pulp liquors (4,054) |
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| 07/16/1996 | US5536366 Digester system for implementing low dissolved solids profiling |
| 07/10/1996 | EP0720676A1 Improved method for bleaching lignocellulosic pulp |
| 07/10/1996 | EP0466752B1 A process for bleaching a fiber pulp with a chemical solution |
| 07/10/1996 | CN1126261A Method for modifying and dewatering alkali paper-making black liquor |
| 07/03/1996 | EP0719359A1 Minimum adverse environmental impact pulp mill |
| 06/27/1996 | WO1996019282A1 Electromembrane processes for the treatment of kraft mill electrostatic precipitator catch |
| 06/26/1996 | EP0639158B1 Method for purifying process water or wastewater containing wood resin |
| 06/25/1996 | US5529697 Decoloring by adding potassium permanganate and precipitation |
| 06/19/1996 | EP0716719A1 Minimum adverse environmental pulp mill with feed to chlorate manufacture |
| 06/18/1996 | US5527427 High solids black liquor of reduced viscosity and viscosity reduction method for high solids black liquor |
| 06/12/1996 | EP0715608A1 Method of incinerating sludge resulting from waste-water treatment |
| 06/11/1996 | US5525783 Microwave heating device for lime and calcining |
| 06/05/1996 | EP0714496A1 Device for manoeuvring an air-control mechanism in a furnace |
| 06/05/1996 | EP0605565B1 A method in ozone bleaching of pulp |
| 06/05/1996 | CN1123858A Preparation of hot washing thick liquid for plant fiber |
| 06/03/1996 | CA2163852A1 Utilization of oxidized white liquor |
| 05/30/1996 | WO1996016225A1 Device and process for dissolving smelt from recovery boilers |
| 05/23/1996 | WO1996015318A1 Method to regenerate gas mixture in ozone-bleaching process |
| 05/23/1996 | WO1996015313A1 Black liquor impregnation in single-vessel hydraulic digester |
| 05/23/1996 | CA2205182A1 Method to regenerate gas mixture in ozone-bleaching process |
| 05/21/1996 | US5518583 Minimizing effluents from a cellulose pulp mill |
| 05/21/1996 | US5518582 Method of affecting the sulphur content and/or sulphur compound composition of a melt in a recovery boiler |
| 05/17/1996 | WO1996014468A1 Selective recovery of chemicals from cellulose spent liquor by liquor gasifying |
| 05/17/1996 | WO1996014467A1 Method of precipitating transition metals and alkaline earth metals from bleach plant effluents |
| 05/17/1996 | WO1996014466A1 Method for complete combustion of bleach plant waste liquors |
| 05/17/1996 | WO1996014465A1 Evaporation of bleach filtrate in the gas cooling system of a plant for gasifying black liquor |
| 05/17/1996 | WO1996014464A1 Odour treatment of malodorous condensates with ozone-containing residual gas |
| 05/17/1996 | CA2203392A1 Method of precipitating transition metals and alkaline earth metals from bleach plant effluents |
| 05/17/1996 | CA2202753A1 Selective recovery of chemicals from cellulose spent liquor by liquor gasifying |
| 05/17/1996 | CA2202494A1 Evaporation of bleach filtrate in the gas cooling system of a plant for gasifying black liquor |
| 05/07/1996 | CA2054799C Method and arrangement for treating black liquor |
| 05/07/1996 | CA2043868C Two stage white liquor oxidation apparatus and method |
| 05/02/1996 | WO1996012848A1 Process for the final evaporation of black liquor |
| 05/02/1996 | WO1996012847A1 Leaching of precipitator ash |
| 04/30/1996 | US5512141 Distillation apparatus |
| 04/25/1996 | WO1996011733A1 Defoamer composition and method of using the same |
| 04/25/1996 | CA2202552A1 Defoamer composition and method of using the same |
| 04/24/1996 | CN1121127A Paper soda recovering method for small paper mill |
| 04/23/1996 | US5510035 Membrane diffusion dialysis; permselectivity; cation exchanging using cation exchange membrane |
| 04/23/1996 | US5509999 Desulfurization by injecting carbon dioxide gas, demetallization by adjusting the ph alkalinity to precipitate |
| 04/23/1996 | US5509998 Method and apparatus for clarifying green liquor |
| 04/23/1996 | US5509997 Method of recovering energy from waste liquors from pulp processes |
| 04/18/1996 | WO1996011299A1 A method for treating acid and alkaline waste streams from a bleach plant separately |
| 04/18/1996 | CA2201117A1 A process for treatment of effluents from a pulp producing plant |
| 04/17/1996 | CN1031592C Purification of process gas from partial combustion of black liquor |
| 04/16/1996 | US5507912 Providing high efficiency in both phases of digesting process |
| 04/16/1996 | US5507141 Process for recovering energy from a combustible gas |
| 04/10/1996 | EP0705363A1 Method of firing black liquor in recovery boilers and a recovery boiler for firing black liquor |
| 04/10/1996 | CN1120358A Method of treating process water |
| 04/10/1996 | CN1120098A Black liquor gasifier |
| 04/10/1996 | CN1120097A Double spherical cooking digester black liquor extracted from sphere |
| 04/04/1996 | WO1996009872A1 Liquid distributor for an evaporator |
| 03/27/1996 | EP0656083B1 Reduction of chloride in pulping chemical recovery systems |
| 03/20/1996 | CN1119032A A method of separating sulphur compounds |
| 03/19/1996 | US5500085 Conversion to sodium sulfate, one step |
| 03/15/1996 | CA2155048A1 Additives for black liquor recovery boiler deposits |
| 03/14/1996 | WO1996007787A1 Cooking with spent liquor pretreatment of cellulose material |
| 03/07/1996 | WO1996006978A1 Method of papermaking having zero liquid discharge |
| 03/07/1996 | CA2208269A1 Method of papermaking having zero liquid discharge |
| 03/06/1996 | CN1118146A Process and apparatus for absorbing hydrogen sulphide |
| 02/29/1996 | WO1996006217A1 Enhancements in pulping with dissolved solids control |
| 02/28/1996 | EP0698139A1 Dissolved solids control in pulp production |
| 02/28/1996 | EP0697904A1 Method for fractionating sulphite cooking liquor |
| 02/22/1996 | WO1996005366A1 A recovery boiler where the flue gas is divided into two streams and a method therefore |
| 02/20/1996 | CA2062797C An apparatus for detecting carryover particles in the interior of a furnace |
| 02/14/1996 | EP0639096B1 Apparatus for the evaporation of a liquid and it's subsequent condensation |
| 02/14/1996 | EP0614500B1 Method of recovering energy from waste liquors from pulp processes |
| 02/14/1996 | CN1116671A Treatment and recovery of black liquor |
| 02/06/1996 | US5489363 Pulping with low dissolved solids for improved pulp strength |
| 01/31/1996 | CN1115741A Sewage purifying process in regenerated-paper making |
| 01/30/1996 | CA2077216C Manufacture of cellulose |
| 01/30/1996 | CA2046545C Method of controlling sulfidity of a sulfate cellulose mill |
| 01/24/1996 | EP0693145A1 Process for converting sodium sulphate |
| 01/24/1996 | EP0693144A1 Method of treating process water |
| 01/18/1996 | WO1996001140A1 Evaporator operating according to the falling film principle |
| 01/17/1996 | EP0692044A1 Method for reusing spent gas from an ozone bleaching reactor |
| 01/12/1996 | CA2153381A1 Method and apparatus for treatment of black liquor |
| 01/04/1996 | WO1996000322A1 Improved process for recycling bleach plant filtrate |
| 01/04/1996 | CA2193829A1 Improved process for recycling bleach plant filtrate |
| 01/02/1996 | US5480512 High pressure heating black liquor to generate sulfur containing gases; removal, evaporation |
| 12/28/1995 | WO1995035410A1 Process for washing gas formed by gasifying black liquor |
| 12/28/1995 | WO1995035409A1 Recovery boiler with rotating secondary air below and a constriction above the level at which the liquor is injected |
| 12/27/1995 | EP0688374A1 A method of separating sulphur compounds |
| 12/26/1995 | US5478440 Method and apparatus for improving the safety of a spent liquor recovery boiler |
| 12/23/1995 | CA2126498A1 Removal of silicon-containing species from aqueous solutions with partially dehydrated metal hydroxide |
| 12/20/1995 | EP0687766A1 Method for the manufacture of cooking liquors by green liquor crystallization |
| 12/20/1995 | EP0687725A1 Foam control agent |
| 12/20/1995 | EP0687724A1 Foam control agent |
| 12/20/1995 | EP0687323A1 Zero discharge mill distillation, salt recovery, and water management |
| 12/20/1995 | EP0687247A1 Process for electrochemical treatment of cellulose waste lye |
| 12/20/1995 | CN1030537C Non-pollution basic process for treating black liquor of grass pulp |
| 12/13/1995 | EP0608244B1 Method for the manufacture of tall oils |
| 12/05/1995 | US5472568 Method for controlling the viscosity of Kraft black liquor |
| 12/05/1995 | US5472567 Method of chemically reacting a slurry with a gas |
| 11/29/1995 | EP0672210A4 Method for controlling an ozone bleaching process. |
| 11/28/1995 | US5470481 Method and apparatus for recovering wash water from pulp and paper mill effluent |
| 11/28/1995 | US5470480 Process for treating waste water effluent |
| 11/23/1995 | WO1995031600A1 Method for improving capacity when filtering green liquor |
| 11/23/1995 | CA2188941A1 Method for improving capacity when filtering green liquor |
| 11/08/1995 | EP0680531A1 Method for the recovery of cellulose spent liquors. |