| Patents for D21C 11 - Regeneration of pulp liquors (4,054) |
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| 06/07/1983 | CA1147511A1 Soft scale inhibition using methyl vinyl ether/maleic anhydride copolymers |
| 05/17/1983 | CA1146306A1 Binding lignocellulosic materials |
| 05/17/1983 | CA1146305A1 Method of recovering cooking chemicals |
| 04/28/1983 | WO1983001469A1 A method of polysulphide treatment in alkaline pulping of lignocellulose material |
| 04/28/1983 | WO1983001437A1 Flowing melt layer process for production of sulfides |
| 04/26/1983 | US4381218 Apparatus for testing combustibility of wood pulp blow gases |
| 04/19/1983 | CA1144714A1 Polyacrylic acids and methyl vinyl ether/maleic anhydride copolymers as soft scale inhibitors |
| 03/29/1983 | CA1143514A1 Composition for treating soft scale |
| 03/22/1983 | US4377439 Pulp mill recovery |
| 03/15/1983 | CA1142713A1 Accelerated process for causticization of kraft green liquor |
| 02/08/1983 | US4372761 Scrubber for cleaning dust-loaded gas and steam |
| 02/01/1983 | CA1140382A1 Process for producing fiberboard wherein dissolved wood matter is separated from the process water |
| 01/18/1983 | CA1139507A1 Process for deodorizing evaporation condensates in the pulp industry |
| 12/28/1982 | CA1138253A1 Lime sludge press unit |
| 12/14/1982 | US4363698 Method for drying and burning viscous aqueous liquors which contain organics |
| 11/09/1982 | CA1135101A1 Method for secondary heat recovery in batchwise cellulose digesting |
| 11/09/1982 | CA1135100A1 Method of cooking cellulose material |
| 09/22/1982 | EP0060277A1 Process to produce pulps. |
| 09/07/1982 | CA1130959A1 Black-liquor processing |
| 09/02/1982 | WO1982002909A1 Process for purifying black lye by elimination of silicic acid |
| 08/31/1982 | US4347220 System for drying and burning viscous aqueous liquors which contain organics |
| 08/31/1982 | US4347110 Fluid flow path with two electrode, one being grounded |
| 08/31/1982 | US4347102 Elimination of potassium compounds from sodium-based pulped cycles |
| 08/17/1982 | CA1130023A1 Method of treating pulp bleaching effluents |
| 08/17/1982 | CA1129786A1 Pressurized filter |
| 08/10/1982 | CA1129162A1 Pulping process reactant recovery system |
| 08/05/1982 | WO1982002587A1 Method and apparatus for recovering waste energy |
| 07/22/1982 | WO1982002414A1 Hydrophobic silica or silicate compositions for containing the same and methods for making and using the same |
| 07/20/1982 | CA1127804A1 Method for improving efficiency of black liquor oxidation in pulp mills |
| 07/13/1982 | CA1127479A1 Waste liquor fluidized bed steam generator |
| 06/30/1982 | EP0054777A2 Process for preparing a cation exchanger, and its use |
| 06/22/1982 | US4336102 Method for recovery and reuse of ammonia in ammonia-base sulfite cooking liquors |
| 06/15/1982 | US4334956 Converting to green liquor, oxidation, spent neutral sulfite semichemical black liquor |
| 06/15/1982 | CA1125459A1 Process for recovery of pulp mill chemicals |
| 06/10/1982 | WO1982001901A1 Reutilization of spent pulping liquors |
| 06/08/1982 | US4333800 Method for the recovery of easily evaporable components from hot gases |
| 05/25/1982 | US4331507 Precipitation of silica with bauxite |
| 05/25/1982 | CA1124016A1 Catalyzing reduction in a kraft recovery boiler |
| 05/18/1982 | US4330411 Process for treating clarified sludge |
| 05/11/1982 | US4329199 Process for digesting and bleaching cellulosic material with reduced emissions |
| 04/27/1982 | CA1122360A1 Method at the digestion of cellulose-containing material |
| 04/21/1982 | EP0049831A2 Process for the precipitation of lignosulfonate from waste sulfite liquor |
| 04/20/1982 | CA1121953A1 Process and apparatus for controlling the degree of causticization in the preparation of white liquor from the chemicals recovered from black liquor |
| 04/13/1982 | US4324659 Lime sludge press unit |
| 04/01/1982 | WO1982001019A1 Process to produce pulps |
| 03/30/1982 | US4322266 Circulating the ferrous sulfide precipitate obtained from the green liquor to the combustion furnace to produce suldies from sulfates |
| 03/30/1982 | CA1120663A1 Method and apparatus for producing pulp |
| 03/23/1982 | CA1120211A1 Process for the inhibition of the formation of deposits in cellulose pulping and cellulose pulp treating processes |
| 02/04/1982 | WO1982000260A1 Tall oil recovery system and apparatus |
| 02/02/1982 | US4313788 Process for reducing oxygen consumption in black liquor oxidation |
| 01/26/1982 | US4312702 Fluidized bed start up and operation |
| 01/26/1982 | CA1116817A1 Recovery process and apparatus for alkali metal-containing spent liquor |
| 01/19/1982 | US4311670 Fluidized bed reactor system |
| 01/19/1982 | US4311666 Apparatus for controlling the degree of causticization in the preparation of white liquor from the chemicals recovered from black liquor |
| 01/06/1982 | EP0043342A1 A method for the delignification of wood and other ligno-cellulosic products |
| 01/05/1982 | CA1115490A1 Alkali regenerating process |
| 01/05/1982 | CA1115464A1 Method for carbonation of green liquor by means of concentrated carbon dioxide gas in a mixing reactor and for the separation of concentrated hydrogen sulphide only in process steps after carbonation for the preparation of alkali carbonate |
| 01/05/1982 | CA1115463A1 Method in producing magnesium sulphite pulp |
| 12/10/1981 | WO1981003506A1 Method for processing the used solutions of digestion of lignocellulose materials during the production of paper pulp through the so-cold"sulphite"or"bisulphite"methods |
| 12/08/1981 | US4304739 For contacting air with a cleaning liquid |
| 12/02/1981 | EP0041050A1 Process for treating the waste liquors spent upon the digestion of lignocellulosic materials during paper pulp production according to the sulphite or bisulphite process |
| 12/01/1981 | US4303469 Combustion products in a reducing gas |
| 12/01/1981 | CA1113207A1 Removal of potassium values from pulp mill liquors |
| 11/25/1981 | EP0014200B1 Air cleaners |
| 11/24/1981 | US4302281 Reducing amount of ballast in white liquor |
| 11/24/1981 | CA1112817A1 Pyrolysis of spent pulping liquors |
| 11/18/1981 | EP0040093A1 System and process for reducing oxygen consumption in black liquor oxidation |
| 11/17/1981 | US4301000 Method and apparatus for fractionation and recovery of limestone grits in kraft pulping process |
| 11/10/1981 | US4299652 Process for recovery of pulp mill chemicals |
| 10/21/1981 | EP0038317A1 Process for producing chemical substances from acidic hydrolysates of plants |
| 10/20/1981 | CA1110808A1 Method of utilizing residual heat in the production of cellulose and an installation for carrying out the method |
| 09/29/1981 | CA1109611A1 Potassium-based pulp mill process |
| 09/08/1981 | US4288286 Digestor liquor cycle integrated with sulfur cycle |
| 09/08/1981 | CA1108378A1 Process for the purification of blow-off gas containing carbon oxides |
| 09/01/1981 | CA1107941A1 Method of refining of fibre material |
| 09/01/1981 | CA1107918A1 Methods for recovery and recycling of chemicals from sodium sulfite and sodium bisulfite pulping operations |
| 08/18/1981 | CA1107412A1 Method for removing odor from fluid |
| 08/18/1981 | CA1107009A1 Device for recovering sodium chemicals from green liquor and flue gases |
| 07/21/1981 | US4279126 Method of utilizing residual heat in the production of cellulose and an installation for carrying out the method |
| 07/14/1981 | CA1104765A1 Process for recovery of chemicals from pulping waste liquor |
| 07/14/1981 | CA1104764A1 Black liquor recovery |
| 06/23/1981 | US4274911 Digestion |
| 06/02/1981 | CA1102055A1 Modified system for recovery of sodium chloride from white liquor |
| 05/19/1981 | US4268350 Method of treating pulp bleaching effluents |
| 05/12/1981 | CA1100817A1 Method of treating material in a fluidized bed reactor |
| 04/28/1981 | US4264445 Pressurized filter |
| 04/21/1981 | US4263092 Method for treating black liquor using acrylic acid polymer |
| 04/07/1981 | CA1098657A1 Method of recovering heat as well as fractions containing volatile alcohols and sulphur compounds from black liquor in connection with pulping |
| 03/31/1981 | US4259147 Pulping process |
| 03/17/1981 | CA1097464A1 Process for maintaining a low sodium chloride content in recycled sodium chemicals of sodium-based pulp manufacturing processes |
| 03/10/1981 | US4255309 Using polyacrylic acid or polysodium acrylate in a blend to prevent precipitation in black liquor of the kraft process |
| 03/03/1981 | US4253911 By treating with carbon dioxide gas and withdrawal from recycle solution a portion of sodium chloride mother liquor |
| 02/24/1981 | CA1096113A1 Fluidized bed recovery of sodium carbonate from spent cooking liquor |
| 02/24/1981 | CA1096110A1 Recovery of chemicals |
| 02/17/1981 | CA1095663A1 Pulping process |
| 02/10/1981 | US4249990 Process for removal of potassium values from pulp mill liquors |
| 01/28/1981 | EP0022841A1 Black-liquor processing. |
| 01/13/1981 | US4244779 Recycle flue gases, collect dusts for thermal decomposition |
| 12/30/1980 | US4242177 Method for oxidizing malodorous sulfur compounds in kraft cooking liquor |
| 12/23/1980 | CA1092054A1 Method and apparatus for removing colloidal suspensions |