| Patents for D21C 11 - Regeneration of pulp liquors (4,054) |
|---|
| 03/05/1991 | CA1280945C Recovery boiler smelt spout |
| 02/26/1991 | US4995983 Membrane separation process |
| 01/29/1991 | US4988407 Process and apparatus for producing dry black liquor solids |
| 01/22/1991 | CA1279157C Process for causticizing of an aqueous solution containing alkali carbonate |
| 01/15/1991 | CA1279131C Oxidation process for substances dissolved or suspended in an aqueous medium |
| 01/15/1991 | CA1278919C Reduction burning and compositions therefore |
| 01/10/1991 | WO1990012637A3 Electrodialytic water splitting process for the treatment of aqueous electrolytes |
| 01/09/1991 | EP0407370A2 High sulfidity cook for paper pulp using black liquor sulfonization of steamed chips |
| 01/01/1991 | US4981556 Papermaking |
| 12/25/1990 | US4979448 Apparatus and method for recovery of constituents and heat from fluidized bed combustion |
| 12/18/1990 | US4977943 Mixing waste paper dissolving slurry and treating gas before floatator treating step, separation of ink and sticky residues, deinking |
| 12/18/1990 | CA1277808C Black liquor concentrating apparatus incorporating black liquor combustion exhaust gas absorbing means |
| 12/15/1990 | WO1990015652A1 Multistage evaporating system |
| 12/05/1990 | EP0399999A1 Method for green liquor cleaning in sulphate pulp mills. |
| 12/01/1990 | WO1990014873A1 Two-stage condenser |
| 12/01/1990 | CA2055610A1 Two-stage condenser |
| 11/28/1990 | EP0399404A2 Process for reducing SO2 and/or NOx emissions in combustion processes |
| 11/13/1990 | CA1276059C Method and apparatus for deactivating spent liquors |
| 11/13/1990 | CA1276058C Process for increasing the solids content of black liquor at its discovery in a sulphate pulping process |
| 11/06/1990 | CA1275761C Recovering chemicals from spent pulp liquors |
| 11/06/1990 | CA1275757C Method of processing waste paper |
| 10/27/1990 | CA2015538A1 Process and device for continuous cooking of cellulose |
| 10/20/1990 | WO1990012637A2 Electrodialytic water splitting process for the treatment of aqueous electrolytes |
| 10/16/1990 | US4963227 Steaming, pressurization, depressurization, defibering, condensing |
| 10/08/1990 | WO1990012146A1 A process for treating a fiber pulp with a chemical solution |
| 10/08/1990 | CA2049951A1 Process for treating a fiber pulp with a chemical solution |
| 10/03/1990 | EP0389596A1 Apparatus and method of treating black liquor |
| 09/30/1990 | CA2013456A1 Method for regulating the feed or combustion conditions of concentrated waste liquours of varying chemical and physical properties, for their burning in a soda recovery unit |
| 09/25/1990 | CA1274355A1 Gasification of black liquor |
| 09/18/1990 | CA1274058A1 Method for evaporation of spent liquor |
| 09/12/1990 | EP0386065A1 A method of removing organic substances from effluents from pulp and paper manufacturing processes |
| 09/11/1990 | CA1273758A1 Causticizing process |
| 09/05/1990 | EP0275256B1 Method of processing waste paper |
| 09/04/1990 | US4953607 Multistage evaporating system |
| 09/04/1990 | CA1273455A1 Make-up liquor and black liquor evaporating processes during pulp production |
| 08/29/1990 | CN1044966A Recovery and reuse method of papermaking effuent |
| 08/23/1990 | WO1990010108A1 Recovery of turpentine and heat |
| 08/23/1990 | CA2046903A1 Recovery of turpentine and heat |
| 08/22/1990 | EP0383565A1 Processes and apparatus for endothermic reactions |
| 08/21/1990 | CA1272856A1 Method for regulating, for the purpose of burning in the soda-ash furnace, the feeding-in or combustion conditions of concentrated spent liquors of varying chemical and physical composition |
| 07/31/1990 | US4944840 Method and apparatus for evaporating waste liquor produced when cooking fibrous material containing cellulose |
| 07/31/1990 | CA1272309A1 Process for the decolorization of pulp mill process streams |
| 07/31/1990 | CA1272005A1 Process for chemicals and energy recovery |
| 07/17/1990 | US4941946 Polyacrylic acid and a copolymer of sulfonated styrene and maleic anhydride added to sulfite liquors followed by evaporation |
| 07/17/1990 | US4941945 Method for clarifying green liquor |
| 07/10/1990 | CA1271304A1 Method for burning evaporated waste liquor |
| 06/28/1990 | WO1990006964A1 A lignin preparation and a method for its manufacture |
| 06/26/1990 | CA1270608A1 Separation of caustic liquor, lime sludge and sludge in a causticising process |
| 06/06/1990 | CN1042743A Soda recovery process of small paper mill and its equipment |
| 05/29/1990 | US4929355 Method and apparatus for the separation of caustic liquor, lime sludge and sludge in a causticizing process |
| 05/29/1990 | US4929307 Method of decreasing black liquor viscosity |
| 05/29/1990 | CA1269503A1 Method of recovering alkali chemicals from flue gases containing alkaline metal vapor |
| 05/23/1990 | EP0369650A2 Method and apparatus for the treatment of calcium carbonate slurry as residue from the manufacture of paper |
| 05/22/1990 | CA1269345A1 Process for obtaining lignin from alkaline solutions thereof |
| 05/17/1990 | CA2003112A1 Method and apparatus for the treatment of calcium carbonate slurry as residue from the manufacture of paper |
| 05/15/1990 | US4925527 Method for the recovery of turpentine and heat in a refiner pulping process |
| 05/15/1990 | CA1268907A1 Method for treatment of spent peroxide bleaching liquors |
| 05/02/1990 | CN1041799A Treatment of paper-making black waste liquid and degumming liquid for ramie |
| 05/01/1990 | US4921613 Method for purifying resin-containing waste liquor in the manufacture of cellulose pulps |
| 05/01/1990 | CA1268303A1 Recausticizing kraft green liquor |
| 04/25/1990 | CN1041627A Treatment for paper making black liquor and comprehensive utilizing method |
| 04/25/1990 | CA2001270A1 Method for the treatment of spent liquers in pulp production processes in the wood-processing industry |
| 04/17/1990 | US4917763 Method of recovering chemical from spent pulp liquors |
| 04/17/1990 | CA1267789A1 Method of measuring dry substance in flue gases |
| 04/11/1990 | EP0250410B1 A method of removing macromolecular organic dissolved and colloidal material from wood processing industry effluents |
| 04/10/1990 | US4915784 Process and apparatus for removing contaminants from pulp digester vent gas |
| 04/10/1990 | CA1267648A1 Process for lignin recovery |
| 04/10/1990 | CA1267507A1 Wet, pressure, partial oxidation of black liquor |
| 04/10/1990 | CA1267506A1 Method and apparatus for concentrating black liquor |
| 04/03/1990 | CA1267367A1 Procedure for filtering lime sludge meant to be regenerated to lime |
| 04/03/1990 | CA1267255A1 Method for increasing the efficiency of a causticizing process |
| 03/28/1990 | EP0261116B1 Method of recovering alkaline chemicals from flue gases containing alkaline metal vapor |
| 03/28/1990 | CN2055148U Paper from waste cloth fibre |
| 03/27/1990 | US4911787 Oxidizing waste sulfur compound discharged from Kraft cooking wood material; heat concentrating |
| 03/22/1990 | WO1990002838A1 Apparatus and method of treating black liquor |
| 03/07/1990 | CN1040263A Apparatus and process for generating steam from wet fuel |
| 03/06/1990 | CA1266355A1 Black liquor gasification process |
| 02/28/1990 | EP0356203A2 Treatment of effluents |
| 02/22/1990 | WO1990001663A1 A process and an apparatus for drying wet fuel |
| 02/21/1990 | CN2053222U Multifunctional boiler by waste heat of flue-gas for recovering alkali |
| 02/07/1990 | CN1039459A Multifunction alkaline recovering smoke and waste steam boiler |
| 01/30/1990 | US4897157 Make-up liquor and black liquor evaporating processing during pulp production |
| 01/23/1990 | CA1264506A1 Method of recovering chemicals from spent pulp liquors |
| 01/16/1990 | US4894217 Process for causticizing of an aqueous solution containing alkali carbonate |
| 01/16/1990 | CA1264403A1 Process for preparing cellulose pulp from lignocellulosic material while removing high molecular weight substances from the pulping liquor |
| 01/03/1990 | CN2050537U Soda recovery boiler of using smoke to heat air |
| 01/02/1990 | US4891097 Method for regulating, the feeding-in or combustion conditions of concentrated spent liquors |
| 01/02/1990 | US4891070 Water soluble, storage stable |
| 12/27/1989 | CN1006199B Process for the decolorization |
| 12/26/1989 | US4889592 Process computer for adjusting conditions; elasticity and hardness |
| 11/23/1989 | EP0342857A2 Waste paper de-inking system |
| 11/21/1989 | US4882010 Method for burning evaporated waste liquor |
| 11/15/1989 | CN1037183A Treatment by chemical separation of black liquid which is resulted from the sulphate method paper making |
| 11/07/1989 | US4878441 Apparatus and process for generating steam from wet fuel |
| 10/10/1989 | US4872950 Thermal decomposition with insufficient oxygen; sulfur-containing gases are absorbed in alkaline solutions; heat exchanging |
| 10/04/1989 | EP0335242A2 Process and preservative for fodder preservation |
| 10/03/1989 | US4871459 Filter bed clarifier |
| 09/27/1989 | EP0334398A2 Process for reducing scaling in sulphite waste liquor evaporation plants |
| 09/12/1989 | US4865750 Methods for reducing anions in process chemicals |
| 08/30/1989 | EP0330387A2 Improved method and apparatus for processing pulp |