| Patents for D21C 11 - Regeneration of pulp liquors (4,054) |
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| 03/04/1997 | US5607549 Method for the manufacture of cooking liquors of different sulphidity by green liquor crystallization |
| 03/04/1997 | US5607548 Crystallizing out sodium carbonate |
| 02/26/1997 | EP0738343A4 A method of recovering energy and chemicals from black liquor |
| 02/26/1997 | CN1034135C Method for removing organic pollution materials from waste water of papermaking |
| 02/20/1997 | WO1997006305A1 Method for reprocessing an ozone-containing gas present in a pulp bleaching plant |
| 02/20/1997 | CA2229046A1 Method for reprocessing an ozone-containing gas present in a pulp bleaching plant |
| 02/19/1997 | EP0617747B1 A method of preparing digesting liquor |
| 02/19/1997 | CN1143398A Impact of temperature and alkali charge on pulp brightness |
| 02/19/1997 | CN1143050A Method for treating liquid |
| 02/18/1997 | US5603803 Water cooled tubes in walls; papermaking |
| 02/18/1997 | CA2089097C Removal of aox from bleach plant mill effluents by ph shift using the alkalinity/acidity sources available at the mill |
| 02/12/1997 | CN1142557A Process for treatment of gaseous discharges resulting from kraft process using derivatives of undecylenic and/or undecynoic acid |
| 02/12/1997 | CN1142556A Alkali recovery from waste liquid of grass pulp papermaking by multi-point drying and burning |
| 02/06/1997 | WO1997003928A1 Process for treating a surplus activated sludge |
| 02/06/1997 | CA2224683A1 Process for treating a surplus activated sludge |
| 02/05/1997 | EP0756511A1 Method for fractionating a solution |
| 02/05/1997 | CN1142256A Recovery boiler for combustion of wast liquors |
| 02/05/1997 | CN1141983A Method for comprehensive control and treatment of black liquor from alkali paper-making |
| 02/01/1997 | CA2182261A1 Method and agent for inhibiting incrustations in evaporators for concentrating black liquor |
| 01/30/1997 | WO1997003245A1 Method of separating impurities from lime and lime sludge and a method of causticizing green liquor containing impurities, such as silicon, in two stages |
| 01/30/1997 | CA2226127A1 Method of separating impurities from lime and lime sludge and a method of causticizing green liquor containing impurities, such as silicon, in two stages |
| 01/28/1997 | US5597445 Method for recovering sodium from a spent cooking liquor |
| 01/23/1997 | WO1997002383A1 Process for producing polysulphide by means of oxidizing sulphide in spent liquors from kraft cellulose cooking |
| 01/23/1997 | WO1997002382A1 Method for producing polysulphide by means of oxidizing sulphide in spent liquors from kraft cellulose cooking |
| 01/23/1997 | CA2230572A1 Process for producing polysulphide by means of oxidizing sulphide in spent liquors from kraft cellulose cooking |
| 01/22/1997 | EP0754799A2 Leaching process |
| 01/21/1997 | US5595628 Production of pulp by the soda-anthraquinone process (SAP) with recovery of the cooking chemicals |
| 01/15/1997 | EP0660897B1 Method for the combustion of waste liquids |
| 01/14/1997 | US5593542 Useful for papermaking |
| 01/08/1997 | EP0752025A1 Process for combusting sulphite liquor containing magnesium or ammonium, and a boiler for combusting sulphite liquor in accordance with the process |
| 01/02/1997 | EP0750699A1 Clarifying and/or filtering of green liquor and an apparatus therefore |
| 01/02/1997 | EP0750697A1 Regeneration of pulp liquors |
| 01/01/1997 | CN1139467A Process for extracting pure, coarse grain silicic acid crystals |
| 01/01/1997 | CN1139167A Enclosed and semienclosed papermaking sewage treating equipment and method |
| 12/31/1996 | US5589053 Electrolysis process for removal of caustic in hemicellulose caustic |
| 12/27/1996 | EP0750068A1 Treatment of gas effluents from a Kraft process using undecylenic and/or undecynoic acid derivatives |
| 12/24/1996 | US5587049 Low temperature; recirculation of liquids |
| 12/18/1996 | EP0748412A1 Impact of temperature and alkali charge on pulp brightness |
| 12/11/1996 | EP0746651A1 Polysulfide production in white liquor |
| 12/11/1996 | EP0746650A1 Pulping of fibrous plant materials and recovery of resultant by-products |
| 12/10/1996 | US5582683 Method for the recovery of chemical values from black liquor in multiple streams of different chemical values |
| 12/10/1996 | CA2083240C Method and apparatus for use in monitoring and controlling a black liquor recovery furnace |
| 12/05/1996 | WO1996038627A2 Oxidative treatment of bleach plant effluent |
| 12/05/1996 | WO1996032532A3 Process and apparatus for removing low concentration, high-volume non-condensable gases produced in a kraft pulping process |
| 12/04/1996 | EP0745155A1 Process for separating off chloride from sulphide-containing alkaline liquor |
| 12/04/1996 | CN2241705Y Liquid medicine and fibre separating and recovering apparatus |
| 11/19/1996 | US5575890 Method for selectively increasing the sulfide ion concentration and sulfidity of kraft cooking liquor during kraft cooking of wood |
| 11/13/1996 | EP0742311A1 Method and apparatus for recovering fiber from effluent streams |
| 11/13/1996 | EP0742310A1 Treatment of effluent from a paper treatment process |
| 11/11/1996 | CA2149087A1 Black liquor gasifier |
| 11/09/1996 | CA2175434A1 Method and apparatus for recovering fiber from effluent streams |
| 11/06/1996 | EP0740719A1 Recovery boiler for combustion of waste liquors |
| 11/06/1996 | CA2170553A1 Treatment of filtrates in peroxide bleaching of pulp |
| 10/31/1996 | WO1996034235A1 Process and plant for improved heat efficiency by condensation of vapour in concentrated solutions |
| 10/31/1996 | CA2219302A1 Process and plant for improved heat efficiency by condensation of vapour in concentrated solutions |
| 10/30/1996 | EP0739434A1 Improved process for recycling bleach plant filtrate |
| 10/24/1996 | WO1996032998A1 Falling-film evaporator for spent liquor from chemical pulping, and process for manufacturing tube lamellae in the evaporator |
| 10/23/1996 | EP0738343A1 A method of recovering energy and chemicals from black liquor |
| 10/22/1996 | US5567293 Electrodialysis of solution free of polyvalent cations and containing alkali metal salts of chloride and polyvalent anions using permselective membranes to separate salts |
| 10/17/1996 | WO1996032532A2 Process and apparatus for removing low concentration, high-volume non-condensable gases produced in a kraft pulping process |
| 10/17/1996 | WO1996032531A1 Heat recovery from spent digester cooking liquor |
| 10/16/1996 | EP0737260A1 Economizer of a recovery boiler |
| 10/16/1996 | CN1133568A Method and apparatus for absorbing hydrogen sulphide |
| 10/09/1996 | EP0736119A1 Process for extracting pure, coarse grain silicic acid crystals |
| 10/08/1996 | US5562804 Method for adjusting the sulphur/sodium ratio in the flue gases of a soda recovery boiler |
| 10/02/1996 | EP0734469A1 Implementation of dissolved solids profiling |
| 10/02/1996 | DE19529052C1 Inhibiting deposits in evaporative concn. of sulphite process black liquor |
| 09/26/1996 | WO1996029466A1 High solids black liquor of reduced viscosity and viscosity reduction method for high solids black liquor |
| 09/26/1996 | CA2210750A1 High solids black liquor of reduced viscosity and viscosity reduction method for high solids black liquor |
| 09/18/1996 | CA2171595A1 Use of acid-stage filtrate in cooking liquor preparation |
| 09/17/1996 | US5556605 From co2 and h2s from oxidation of spent cellulose liquor |
| 09/17/1996 | US5556602 Device in a reactor for gasifying spent liquor |
| 09/17/1996 | CA2080417C Selective white liquor oxidation |
| 09/11/1996 | EP0730689A1 Process for integrated evaporation and gasification of spent liquor from cellulose cooking |
| 09/10/1996 | US5554259 Pulp bleaching |
| 09/06/1996 | WO1996027046A1 Method and apparatus for making paper pulp using basic processing effluents from a hydrogen peroxide production plant |
| 09/03/1996 | US5552099 Process for pelletising particles of alkali metal ferrite |
| 08/29/1996 | WO1996026316A1 Black liquor viscosity control |
| 08/28/1996 | EP0728864A2 Zero discharge pulp mill cascading water management |
| 08/28/1996 | EP0728863A2 A process for treating liquids |
| 08/28/1996 | EP0561823B1 Process and device in a chemicals recovery plant in a sulphate pulp mill |
| 08/27/1996 | US5549788 Minimal effluents discharge pulp mill with chemical recovery |
| 08/22/1996 | WO1996025554A1 Method to reduce silicon, phosphor and aluminium contents in green liquor |
| 08/22/1996 | WO1996025553A1 Method of processing of lignocellulose materials by continuous pressure hydrolysis and corresponding equipment |
| 08/22/1996 | WO1996025225A1 Separation of sulphides and chlorides from pulping liquors by electrodialysis |
| 08/20/1996 | US5547543 Apparatus for minimizing effluent discharges and recovering chemicals in a pulp mill |
| 08/20/1996 | US5547542 Process for purification and recycle of solutions |
| 08/20/1996 | US5547012 Dissolved solids control in pulp production |
| 08/14/1996 | EP0672211B1 A method of producing green liquor in chemical recovery in sulfate and sulfite pulp mills |
| 08/14/1996 | EP0652991B1 Zero discharge pulp mill |
| 08/14/1996 | EP0468016B1 Process for preparing kraft pulp |
| 08/13/1996 | US5545385 Combusting liquor in fluidized bed furnace to produce alkalimetal ferrite particles, mixing cooled particles with aqueous solution of alkali metal hydroxide |
| 08/13/1996 | US5545292 Kraft smelt solidification in a fluidized bed reactor |
| 08/08/1996 | WO1996023566A1 Process for treatment of condensate |
| 07/30/1996 | US5540816 Chlorine-free, circulation, evaporation |
| 07/24/1996 | EP0646198B1 Circulating fluidized bed black liquor gasification process and apparatus |
| 07/24/1996 | CN1032378C Fully recovery method for alkali method herb pulp paper-mill black liquor |
| 07/17/1996 | EP0721527A1 Preparation of cooking liquor containing sulphite |
| 07/17/1996 | EP0721525A1 DESCALING BY REGULATING pH AND SALT CONCENTRATION |
| 07/16/1996 | US5536384 Separation of sulphides from pulping liquors by electrodialysis |