| Patents for D21C 11 - Regeneration of pulp liquors (4,054) |
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| 12/23/1980 | CA1091869A1 Method for making chemicals to be added into a process of pulp making in which process soluble base is used |
| 12/16/1980 | US4239589 Process for oxidation of black liquor |
| 12/09/1980 | US4238304 Electrical potential gradient |
| 12/09/1980 | CA1090958A1 Method for the recovery of sulphur compounds, volatile alcohols, turpentine and the like produced in connection with pulping |
| 12/02/1980 | US4237103 Combustion with silica material to sodium silicate, refractory-lined incinerator |
| 12/02/1980 | US4236960 By addition of calcium oxide and measuring the liberated carbon dioxide from sodium carbonate |
| 12/02/1980 | CA1090532A1 Production of polysulphide pulping liquor |
| 11/27/1980 | WO1980002574A1 Pulping liquor reutilization |
| 11/11/1980 | CA1089162A1 Fluidized bed treatment of kraft black liquor with h.sub.2s absorption |
| 11/04/1980 | CA1088957A1 Process for the purification of methanol obtained from kraft pulping condensates |
| 10/14/1980 | US4227966 Limiting amount of sodium hydroxide; washing; circulation |
| 10/07/1980 | CA1087130A1 Method and apparatus for the recovery of easily evaporable components from hot gases |
| 10/07/1980 | CA1087129A1 Wet combustion |
| 09/30/1980 | US4225381 Using mucor, penicillium, cepalosporium, trichoderma, or aspergillus to remove sulfur compounds |
| 09/23/1980 | US4224289 Alkali regeneration process |
| 08/19/1980 | US4218284 Process for the inhibition of the formation of deposits in cellulose pulping and cellulose pulp treating processes |
| 08/05/1980 | CA1082860A1 Burning process for black liquor |
| 08/05/1980 | CA1082857A1 Treatment of effluents in a chlorine based pulp bleaching plant |
| 07/29/1980 | CA1082403A1 Removal of volatile organic components from spent sulfite effluent |
| 07/24/1980 | WO1980001490A1 Black-liquor processing |
| 07/22/1980 | US4213820 Separating eluate from anion exchange resin bed into fractions by color pattern |
| 07/22/1980 | CA1081909A1 Kraft mill recovery system |
| 07/15/1980 | US4212705 Apparatus for recovering high pressure steam from a blow tank |
| 07/15/1980 | US4212702 Process for recovery of chemicals from pulping waste liquor |
| 07/15/1980 | US4212628 Recovery furnace safety system |
| 07/15/1980 | CA1081454A1 Smelt water explosion inhibitor |
| 06/26/1980 | WO1980001291A1 Liquor recovery |
| 06/17/1980 | US4208286 Sulphate soap skimming apparatus |
| 06/17/1980 | US4208245 Pretreating black liquor with sodium bisulfite produced by combusting by-product noncondensibles and treating with sodium carbonate |
| 06/11/1980 | EP0011622A1 Method relating to discontinuous treatment of fibre material |
| 06/03/1980 | CA1078559A1 Smelt spout for recovery boiler |
| 05/13/1980 | CA1077435A1 Chlorine-based bleachery effluent treatment |
| 04/29/1980 | CA1076306A1 Process for reducing the requirement of fresh chemicals without increasing emissions in the pulping of cellulose material with alkaline sodium- and sulfur-containing sulfate pulping liquor |
| 04/22/1980 | CA1075859A1 Process for recovering chemicals from the waste liquors of sulfate cellulose digestion and the waste waters of bleaching |
| 04/16/1980 | EP0009932A1 Method and apparatus for improving efficiency of black liquor oxidation in pulp mills |
| 04/15/1980 | CA1075410A1 Chemical recovery utilizing evaporation steam and exchangers in steam stripping system |
| 04/08/1980 | US4197168 Recovery of anthraquinone from tall oil |
| 04/01/1980 | US4196043 Using ozone and an alkaline peroxide |
| 03/04/1980 | CA1073126A1 Treatment of pulp and paper effluents |
| 02/26/1980 | CA1072262A1 Pulp mill process with sodium chloride removal |
| 02/12/1980 | CA1071358A1 Method of reducing waste stream pollutants by the control and separation of waste contaminants from a multi-stage cellulosic bleaching sequence |
| 02/05/1980 | US4187279 Device for recovering sodium chemicals from green liquor and flue gases |
| 02/05/1980 | CA1070908A1 Bleach plant filtrate recovery |
| 01/29/1980 | CA1070457A1 Removal of sodium chloride from pulp mill operations |
| 01/22/1980 | CA1070152A1 Method and apparatus for batch production of pulp including improved energy reclamation |
| 01/01/1980 | CA1069245A Oxazoline and/or oxazine-modified polymers |
| 12/04/1979 | US4177105 Apparatus for delignifying and bleaching cellulose pulp |
| 11/27/1979 | CA1066857A1 Biological sludge incineration in the recovery furnace of a cellulose processing facility |
| 11/15/1979 | WO1979000931A1 Preparation of white liquor |
| 11/15/1979 | WO1979000899A1 Method at the digestion of cellulose-containing material |
| 11/01/1979 | WO1979000889A1 Air cleaners |
| 10/16/1979 | CA1064206A1 Method of recovering substances in the extraction of spent liquors from the delignification of lignocellulosic material by means of chloride-producing bleaching agents |
| 10/02/1979 | CA1063522A1 Chemical concentration by sequential activated carbon adsorption and fractionation |
| 09/25/1979 | US4169131 Process for recovering caustic alkali from spent alkali liquor |
| 09/25/1979 | CA1063036A1 Chemical concentration by activated carbon adsorption |
| 09/20/1979 | WO1979000693A1 Method relating to discontinuous treatment of fibre material |
| 09/11/1979 | CA1061962A1 Sodium chloride removal in pulp mill systems |
| 09/04/1979 | CA1061512A1 Sodium chloride removal in pulp mill systems |
| 08/28/1979 | CA1061059A1 Pulp mill recovery system |
| 08/21/1979 | US4165253 Process for producing pulp |
| 08/07/1979 | CA1059926A1 Purification of papermarking waste water using pulp stock rejects as filter aid |
| 07/31/1979 | CA1059661A1 Decolorization of effluents from pulp mills |
| 07/31/1979 | CA1059271A1 Removal of sodium chloride from pulp mill systems |
| 07/24/1979 | US4162187 Process for production of sodium thiosulfate and sodium hydroxide |
| 07/17/1979 | CA1058358A1 Removal of dissolved salts from sulphide liquors |
| 07/17/1979 | CA1058357A1 Method of improving smelt properties and reducing dissolving tank explosions during pulping of wood with sodium based liquors |
| 07/10/1979 | CA1058068A1 Multi-steam chest series flow evaporator |
| 07/10/1979 | CA1057910A1 Automatic bed level control for furnaces |
| 07/03/1979 | US4159922 Accelerated process for causticization of Kraft green liquor |
| 07/03/1979 | US4159683 Method for reducing the formation of slag and soot formed from the combustion of carbonaceous waste material |
| 06/26/1979 | US4159223 Use of activated carbon to recover and separate chemicals produced during pulping operations |
| 05/22/1979 | US4155845 Flocculation |
| 05/22/1979 | US4155804 Removal of volatile organic components from spent sulfite effluent |
| 05/15/1979 | US4154643 Recovery process and apparatus for alkali metal-containing spent liquor |
| 05/08/1979 | US4153502 Reacting sodium sulphide and sodium sulfur-oxygen salts in the presence of carbon and oxygen |
| 05/08/1979 | CA1053860A2 Chlorine dioxide generation and pulp bleaching |
| 05/01/1979 | CA1053412A1 Process and apparatus for recovery of sulfur from a polysulfide pulping operation |
| 04/17/1979 | CA1052521A1 Apparatus and method for solidifying smelt into thin sheets |
| 04/10/1979 | US4148684 Methods for recovery and recycling of chemicals from sodium sulfite and sodium bisulfite pulping operations |
| 03/06/1979 | CA1049713A1 Recovering turpentine and heat from black liquor from a continuous digestor |
| 03/06/1979 | CA1049711A1 Chlorine dioxide generation |
| 02/27/1979 | US4141785 Process for recovery of chemicals from pulping waste liquor |
| 02/20/1979 | US4140609 Process for removing colloidal suspensions from a liquid |
| 02/06/1979 | US4138312 Process of recovering sodium carbonate from spent pulping liquors |
| 02/06/1979 | US4138311 Method and apparatus for batch production of pulp including improved energy reclamation |
| 01/30/1979 | US4137134 Method for the recovery of sulphur compounds, volatile alcohols, turpentine and the like produced in connection with pulping |
| 01/30/1979 | CA1047411A1 Method and apparatus for purifying water of organic compounds not readily biodegradable |
| 01/30/1979 | CA1047232A1 Fume control for sulfur dioxide ammonia absorption systems |
| 01/24/1979 | EP0000398A1 Method of manufacturing sodium-metal oxide |
| 01/23/1979 | US4135968 Pyrolysis and combustion of black liquors; pollution control |
| 01/23/1979 | CA1047178A1 Method for treating pulp-containing waste liquors |
| 12/26/1978 | US4131508 White liquor, sodium hydroxide |
| 12/05/1978 | CA1043516A1 Method for producing oxidized white liquor |
| 11/28/1978 | US4127440 Process for purifying waste water obtained by a papermaking process |
| 11/07/1978 | CA1041708A1 Separating sulphur in the form of hydrogen sulphide from clarified green liquor |
| 10/17/1978 | US4120746 Heat exchanger, forced circulation |
| 10/03/1978 | US4118271 Milling, delignification, adding magnesium hydroxide, combustion, absorption, recirculation |
| 09/19/1978 | CA1038562A1 Method of purifying effluents from forest industries |
| 09/05/1978 | US4111743 Method of recovering heat as well as fractions containing volatile alcohols and sulphur compounds from black liquor in connection with pulping |
| 08/29/1978 | US4110154 Sodium bisulfite by cation exchanging calcium bisulfite |