| Patents for D21C 11 - Regeneration of pulp liquors (4,054) |
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| 08/24/1989 | WO1989007480A1 Supercritical separation process for complex organic mixtures |
| 08/15/1989 | US4857282 Combustion of black liquor |
| 08/15/1989 | US4857146 Process for increasing the solids content of black liquor at its recovery in a sulfate pulping process |
| 08/09/1989 | EP0223821B1 Process for chemicals and energy recovery |
| 08/08/1989 | US4855123 With oxygen using specific activated carbon catalyst |
| 08/02/1989 | EP0325891A1 Process for obtaining bleached cellulose pulp |
| 08/02/1989 | EP0179803B1 A process for producing a partially oxidized, concentrated, spent pulping liquor |
| 08/01/1989 | US4853136 Process for oxidizing substances dissolved or in suspension in an aqueous solution |
| 08/01/1989 | US4853082 Process for the activation and delignification of cellulose pulp |
| 07/12/1989 | CN1033852A New technology of disposing pollutant black effluent from small pulp mill |
| 06/28/1989 | EP0321989A1 Method for purifying resin containing waste liquor in the manufacture of cellulose pulp |
| 06/27/1989 | US4842688 Method of removing macromolecular organic dissolved and colloidal material from wood processing industry effluents |
| 06/06/1989 | CA1255058A1 Process for preparation of potassium salts from pulping of lignocellulosic materials |
| 05/23/1989 | CA1254554A1 Method of removing lignin from bleach plant effluents |
| 05/18/1989 | WO1989004395A1 Kraft chemical recovery process |
| 05/05/1989 | WO1989003911A1 A method of removing organic substances from effluents from pulp and paper manufacturing processes |
| 04/12/1989 | EP0311013A2 Chlorine dioxide oxidation of mill effluent color |
| 04/05/1989 | EP0309998A2 A method in the activation of lignocellulosic material with a gas containing nitrogen dioxide |
| 03/14/1989 | US4812207 Using cellulose fibers |
| 02/28/1989 | US4808264 Process for chemicals and energy recovery from waste liquors |
| 01/24/1989 | US4799994 Process for cooking and bleaching pulp |
| 01/04/1989 | CN1030107A Method for recovering chemicals from spent pulp liquors |
| 01/03/1989 | CA1247809A1 Spent pulping liquor recovery process |
| 12/28/1988 | EP0162059B1 Method for causticizing green liquor in an alkaline pulping process |
| 12/13/1988 | CA1246304A1 Process and apparatus for bleaching of pulp |
| 12/06/1988 | US4789428 Using pulp cooker blow steam to heat spent liquor; heater exchanger, flash tank |
| 11/22/1988 | CA1245088A1 Refiner steam turbine drive modifications |
| 11/15/1988 | CA1244605A1 Method for causticizing green liquor in an alkaline pulping process |
| 11/09/1988 | CN88105855A Process for recovering waste alkali and its apparatus |
| 10/11/1988 | US4776889 Waxes as a black liquor viscosity modifier |
| 09/27/1988 | US4773918 Black liquor gasification process |
| 09/13/1988 | US4770742 Papermaking |
| 08/30/1988 | US4767500 With blowing, washing and bleaching steps; alkaline sulfite, alcohol solvent, quinone redox catalyst |
| 08/25/1988 | WO1988006203A1 Method for green liquor cleaning in sulphate pulp mills |
| 08/23/1988 | CA1240812A1 Process for producing nitrogen oxides from aqueous waste cellulose pulp liquor containing nitrogen compounds |
| 08/17/1988 | EP0128170B1 Primary battery system |
| 08/16/1988 | US4764597 One step-oxidation, methylolation, lowering the ph to precipitate |
| 08/16/1988 | US4764596 Precipitating by diluting a water-mucible organic solvent with water and acid |
| 08/16/1988 | US4764251 Method for the impregnation and cooking of lignocellulosic material by a batch cooking using spent impregnation liquor from a previous batch |
| 08/09/1988 | US4762590 Causticizing process |
| 08/02/1988 | US4761204 Steam impingement on smelt |
| 07/27/1988 | EP0275256A1 Method of processing waste paper. |
| 07/27/1988 | CN87104808A New recovery technology for mixed roasting alkali |
| 07/26/1988 | CA1239528A1 Method and apparatus involving supercritical fluid extraction |
| 07/13/1988 | CN87102058A Comprehensive harnessing method of black liquid in making pulp of paper-making and self-excited type of absorption column of gas with turbulent balls |
| 07/12/1988 | US4756837 Wet, pressure, partial oxidation of black liquor |
| 07/07/1988 | DE3644340A1 Process and plant for recovering soda from green liquor |
| 07/06/1988 | EP0273759A2 Procedure for recirculating phenol in a lignocellulosic materials digestion process |
| 07/06/1988 | EP0273758A2 Procedure for separating lignin and phenol from phenol solutions |
| 07/05/1988 | US4755258 Method and apparatus for deactivating spent liquor |
| 06/28/1988 | US4753737 Recovery method for settled black liquor |
| 06/14/1988 | US4750649 Recovery boiler smelt spout |
| 05/31/1988 | US4748004 Apparatus for cleaning air ports of a chemical recovery furnace |
| 05/10/1988 | CA1236596A1 Method of controlling an anaerobic treatment process |
| 05/05/1988 | WO1988003191A1 Method and apparatus for combustion of soda black liquor |
| 05/04/1988 | CN86107289A The manufacturing method of dissolvable lignin from alkali lignin |
| 05/04/1988 | CN85107664B Method of recovering chemicals from spent pulp liquors |
| 05/03/1988 | CA1235863A1 Steam cooled spout |
| 04/19/1988 | US4738835 Gasification, rapid cooling by contact with recirculated solid particles separated from gas |
| 04/12/1988 | US4737238 Screening, dehydration, and delignification |
| 04/12/1988 | CA1235140A1 High charge density, cationic methacrylamide based monomers and their polymers |
| 04/05/1988 | US4735683 Process for preparation of potassium salts from pulp of lignocellulosic materials |
| 03/30/1988 | EP0261116A1 Method of recovering alkaline chemicals from flue gases containing alkaline metal vapor. |
| 03/29/1988 | US4734103 Viscosity/drag reducing additive for high solids black liquor |
| 03/23/1988 | CN87104742A Method of and system for separating silica contained in residual black liquors from pulp manufacture |
| 03/02/1988 | EP0258196A1 A process for the preparation of sulphide-free alkali liquor |
| 02/16/1988 | US4725335 Initiating auto catalytic reaction generating nitrogen oxide |
| 02/16/1988 | CA1232712A1 Heat recovery in black liquor oxidation |
| 02/09/1988 | US4724045 Pulp decolor process |
| 01/27/1988 | CN85109413B Treating waste lye straw pulp-making with wet cracking reaction |
| 01/20/1988 | CN87204056U Facilities for recovering waste steam |
| 01/12/1988 | US4718978 Oxidation, evaporation, combustion |
| 01/07/1988 | EP0251533A1 Alkaline black liquor treatment |
| 01/07/1988 | EP0250410A1 A method of removing macromolecular organic dissolved and colloidal material from wood processing industry effluents. |
| 01/05/1988 | US4717450 Removal of chloride from process solutions |
| 12/22/1987 | US4714591 Apparatus and method involving supercritical fluid extraction |
| 12/22/1987 | CA1230592A1 Organosolv process for hydrolytic decomposition of lignocellulosic and starch materials |
| 12/16/1987 | EP0249545A1 Process and plant for the separation of silica contained in the paper pulp production black waste liquors |
| 12/15/1987 | CA1230209A1 Firing of lime sludge reburning kilns with a solid fuel |
| 12/15/1987 | CA1230207A1 Method for the production of cellulose by the batch cooking process |
| 12/01/1987 | US4710269 Sodium sulfide, sodium carbonate, sodium hydroxide reclaimed as melts; increased capacity |
| 12/01/1987 | US4710268 Method for regulating the pressure of blow-through discharge steam from a reboiler of process steam produced during production of mechanical pulp |
| 12/01/1987 | CA1229757A1 Pulp washing process |
| 11/17/1987 | US4706324 Apparatus for automatically cleaning smelt spouts of a chemical recovery furnace |
| 11/04/1987 | EP0244266A2 Reduction burning and compositions therefor |
| 10/14/1987 | EP0240760A2 Process and apparatus for the precipitation of negatively charged derivatives of lignine |
| 09/22/1987 | US4695881 Apparatus for imaging infrared emitting surfaces |
| 09/22/1987 | US4695386 Process for the decolorization of pulp mill process streams |
| 09/08/1987 | US4692214 Apparatus for producing mechanical pulp with a refiner having its drive shaft connected to a steam turbine output shaft |
| 09/08/1987 | US4692209 Recovery of chemicals from pulp waste liquor |
| 09/01/1987 | US4690634 Method of measuring dry substance in flue gases |
| 08/18/1987 | US4687583 Controlled continuous rotation to deposit lime sludge on drum, then detaching |
| 08/13/1987 | WO1987004738A1 Process control in burning and slaking of lime and causticizing |
| 08/04/1987 | US4683841 Control of a black liquor recovery boiler |
| 07/08/1987 | CN85109413A Treating waste lye of straw pulp-making with wet cracking reaction |
| 06/30/1987 | US4676735 Fluidized bed combustion device for a soda boiler |
| 06/23/1987 | CA1223106A1 Control of active alkali in black liquor |
| 06/16/1987 | US4673459 Radial configuration of evaporator heating elements and method |
| 06/16/1987 | EP0225638A1 A method for delignification of pulp |
| 06/16/1987 | EP0139736B1 Pulp washing process |