| Patents for D21C 11 - Regeneration of pulp liquors (4,054) |
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| 06/10/1987 | EP0224721A1 Recovery of lignin |
| 06/09/1987 | CA1222605A1 Recovery of chemicals from pulp waste liquor |
| 06/09/1987 | CA1222604A1 Black liquor gasification process |
| 06/09/1987 | CA1222603A1 Polution free pulping process using recycled wash effluent from multiple bleach stages to remove black liquor and recovering sodium hydroxide from the black liquor |
| 06/04/1987 | WO1987003315A1 Method of decreasing black liquor viscosity |
| 06/04/1987 | WO1987003314A1 A process for causticizing of an aqueous solution containing alkali carbonate |
| 06/03/1987 | EP0223821A1 Process for chemicals and energy recovery. |
| 06/02/1987 | US4670098 Delignification, separation |
| 05/27/1987 | EP0223438A1 Process for recovering sodium hydroxide from alkaline pulp waste liquor |
| 05/26/1987 | US4668342 Recausticizing kraft green liquor |
| 05/26/1987 | US4668341 Method and apparatus for producing mechanical pulp with a steam turbine driven refiner |
| 05/26/1987 | CA1222201A1 Gas absorption system |
| 05/21/1987 | WO1987003023A1 Method of processing waste paper |
| 05/20/1987 | CN85108206A Processing of recovery of alkaline from straw pulp black lye in method of green lye sulfite |
| 04/21/1987 | US4659471 Method of controlling an anaerobic treatment process |
| 04/15/1987 | CN85107429A Decoration paste for inner wall of buildings from pulp waste of paper mill |
| 03/10/1987 | CA1218808A1 Nonsulphur chemimechanical pulping process |
| 03/10/1987 | CA1218807A1 Causticizing process |
| 02/25/1987 | CN86104368A Process for preparation of potassium salts from pulping of lignocellulosic materials |
| 02/18/1987 | CN85106333A Separation of alkali and lignin from black liquor in paper mill by coagulation |
| 01/28/1987 | CN85105752A Organosol process for hydrolytic decomposition of lignocellulosic and starch materials |
| 01/20/1987 | US4637858 Pyrolysis of black liquor at high temperatures using radiant energy |
| 01/07/1987 | EP0207908A1 Process for increasing the solids content of black liquour at its recovery in a sulfate pulping process |
| 01/02/1987 | DE3620221A1 Process for treating peroxide-bleaching waste liquors |
| 12/30/1986 | EP0207070A2 Process for regenerating a cooking liquor from a waste magnesium bisulphite cooking liquor, and filter apparatus for carrying out the process |
| 12/30/1986 | EP0205778A1 Sulphite pulping process for preparing cellulose pulp from lignocellulosic materials with recovery of the pulping chemicals |
| 12/30/1986 | EP0094967B1 Lime slaker |
| 12/30/1986 | EP0091457B1 A method of polysulphide treatment in alkaline pulping of lignocellulose material |
| 12/18/1986 | WO1986007396A1 Process for chemicals and energy recovery |
| 12/10/1986 | CN86101690A Improved method and appratus for treating pulp mill blak liquor |
| 12/09/1986 | US4627888 Causticizing method |
| 12/04/1986 | WO1986007104A1 Method of recovering alkaline chemicals from flue gases containing alkaline metal vapor |
| 11/26/1986 | EP0202382A2 Process for the decolourization of pulp mill process streams |
| 11/19/1986 | CN85108743A Process for the decolorization |
| 11/18/1986 | CA1214003A1 Method of covering the chemical losses in pulp production |
| 11/12/1986 | CA1213703A Method of recovering chemicals from chloride- containing green liquor |
| 10/28/1986 | US4619813 Gas absorption system |
| 10/28/1986 | US4619733 Pollution free pulping process using recycled wash effluent from multiple bleach stages to remove black liquor and recovering sodium hydroxide from the black liquor |
| 10/28/1986 | US4619732 Treatment with super-heated steam in fluidized bed |
| 10/07/1986 | CA1212413A1 Primary battery system |
| 09/17/1986 | EP0194845A2 A process for concentrating a black liquor |
| 09/16/1986 | CA1211273A1 Flowing melt layer process for production of sulfides |
| 09/16/1986 | CA1211257A1 Process and apparatus for recovery of energy and chemical values from spent pulping liquors |
| 08/28/1986 | WO1986004888A1 A method of removing macromolecular organic dissolved and colloidal material from wood processing industry effluents |
| 08/26/1986 | CA1210209A1 Delignification process of wood and other lignocellulosic materials |
| 08/20/1986 | EP0191679A1 Process for the oxidation of dissolved or suspended substances in an aqueous solution |
| 08/19/1986 | US4606722 Firing of lime sludge reburning kilns with a solid fuel |
| 08/12/1986 | US4604957 Method for wet combustion of organic material |
| 08/12/1986 | CA1209308A1 Process and apparatus for recovery of energy and chemical values from spent pulping liquor |
| 07/31/1986 | WO1986004366A1 A method for burning evaporated waste liquor |
| 07/31/1986 | EP0179803A4 A process for producing a partially oxidized, concentrated, spent pulping liquor. |
| 07/23/1986 | EP0188019A1 Method of cleaning vapour condensate |
| 07/22/1986 | US4601786 Recovery of chemicals from pulp waste liquor with plasma generator heating |
| 07/17/1986 | EP0165945A4 Method of improving the purity of alkali-metal hydroxides. |
| 06/25/1986 | EP0113754B1 Method of cleaning the heating surfaces during pulping |
| 06/24/1986 | CA1206304A1 Pulping method |
| 06/17/1986 | US4595456 Subjecting pulp to plurality of washing steps, heat exchanging, washing filtrates, combining filtrate with cooking liquid conveyed to digestion stage, diluting, heat exchanging |
| 06/17/1986 | CA1205960A1 Kraft pulping process |
| 06/10/1986 | CA1205930A1 Method for the purification of condensates from the sulfate process |
| 06/05/1986 | WO1986003236A1 Method of removing lignin from bleach plant effluents |
| 05/13/1986 | CA1204352A1 Furnace air port cleaner |
| 05/07/1986 | EP0179803A1 A process for producing a partially oxidized, concentrated, spent pulping liquor. |
| 04/22/1986 | US4584076 Process for obtaining lignin from alkaline solutions thereof |
| 04/22/1986 | US4584057 Filtration, electrodialysis;acidification, and separation |
| 04/10/1986 | CN85107664A Method of recovering chemicals from spent pulp liquors |
| 04/02/1986 | EP0176443A1 Process for the valorization of the lime muds from the causticizing cycle of the Kraft process |
| 04/02/1986 | CN85202201U Air flotation separator for black liquor |
| 03/26/1986 | EP0060277B1 Process to produce pulps |
| 02/12/1986 | EP0171093A1 Process for working up waste acid sulphite liquors |
| 02/05/1986 | EP0169946A1 A process for preparing liquid- or shock-absorbing material starting from waste sludge from the paper or board industry |
| 02/04/1986 | US4568422 System for recovering heat in an alkaline pulp digesting process |
| 02/04/1986 | CA1200055A1 Method for controlling the burning of liquor, which varies in its chemical consistency, in a recovery boiler |
| 01/21/1986 | CA1199454A1 Recovery of heat and chemical values from spent pulping liquors |
| 01/02/1986 | EP0165945A1 Method of improving the purity of alkali-metal hydroxides |
| 12/31/1985 | US4561935 Basic solution of reducing agent |
| 12/31/1985 | US4561934 Precarbonating with flue has, evaporation crystallizing to separate chloride salt from solution |
| 12/31/1985 | CA1198558A1 Method for controlling the properties of white liquor |
| 12/17/1985 | US4558733 Heat exchanger having intermittently movable rotational cleaning arms |
| 12/17/1985 | CA1197975A1 Method for recovering sodium chemicals from green liquor and flue gases |
| 11/27/1985 | EP0162059A1 Method for causticizing green liquor in an alkaline pulping process. |
| 10/15/1985 | US4547263 Method for obtaining useful products from green pseudostem, including papermaking pulp plantain |
| 10/08/1985 | CA1194656A1 Process for the preparation of the digesting liquor required in a neutral sulfite cooking with an addition of anthraquinone |
| 09/26/1985 | WO1985004202A1 A process for producing a partially oxidized, concentrated, spent pulping liquor |
| 09/26/1985 | EP0143844A4 Method and apparatus for determining carbonate/sulfide concentration. |
| 09/17/1985 | CA1193406A1 Process to regenerate kraft liquor |
| 09/03/1985 | CA1192708A1 Method relating to dissolving molten smelt and device for desintegrating molten material |
| 08/20/1985 | US4536253 Measuring conductivity of green liquor before and white liquor after, determining reaction of carbonate |
| 08/07/1985 | EP0151097A1 A method for removing resin from a paper pulp process liquor |
| 08/06/1985 | US4533433 Method of covering the chemical losses in pulp production |
| 07/30/1985 | EP0148207A4 Method and apparatus for analyzing and controlling carbonate and sulfide in green liquor slaking and causticizing. |
| 07/17/1985 | EP0148207A1 Method and apparatus for analyzing and controlling carbonate and sulfide in green liquor slaking and causticizing |
| 07/16/1985 | CA1190673A1 Procedure for purifying effluent waters, particularly those produced in wood-processing industry |
| 07/04/1985 | WO1985002834A1 Method of improving the purity of alkali-metal hydroxides |
| 07/02/1985 | US4526760 Recovery of heat and chemical values from spent pulping liquors |
| 06/12/1985 | EP0143844A1 Method and apparatus for determining carbonate/sulfide concentration |
| 06/11/1985 | US4522685 Method of operating a spent pulping liquor combustion apparatus |
| 06/11/1985 | US4522035 Method and apparatus for recovering waste energy |
| 06/11/1985 | CA1188485A1 Alkali regeneration process |
| 06/06/1985 | WO1985002423A1 A method for the production of cellulose by the batch cooking process |
| 05/21/1985 | CA1187487A1 Method for precipitation of sulphonated lignin from sulfite liquors |