| Patents for D21C 11 - Regeneration of pulp liquors (4,054) |
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| 05/18/1994 | CN1086865A Process and design of a CFB black liquor gasification system operation at low pressures |
| 05/11/1994 | WO1994010085A1 Process associated with the gasification of cellulose spent liquors |
| 05/11/1994 | EP0595799A1 Process in thermal decomposing a carbonaceous raw material |
| 05/11/1994 | CA2148359A1 Process associated with the gasification of cellulose spent liquors |
| 05/03/1994 | US5308504 Pumps and detectors for flow control systems |
| 04/28/1994 | WO1994009206A1 Method and apparatus for recovering heat in a spent liquor recovery boiler |
| 04/28/1994 | WO1994009205A1 Apparatus for recovering heat in a spent liquor recovery boiler |
| 04/28/1994 | WO1994009204A1 Process for dividing the sulphide content of the green liquor for the production of white liquors having high and low sulphidity respectively |
| 04/28/1994 | WO1994009203A1 Completely countercurrent cook continuous digester |
| 04/28/1994 | CA2147128A1 Apparatus for recovering heat in a spent liquor recovery boiler |
| 04/28/1994 | CA2146655A1 Process for dividing the sulphide content of the green liquor for the production of white liquors having high and low sulphidity |
| 04/28/1994 | CA2144078A1 Completely concurrent cook continuous digester |
| 04/27/1994 | EP0593744A1 Process for the recovery of processing chemicals from the black liquor in the production of cellulose by organo-solvent processes |
| 04/27/1994 | EP0593743A1 Production of cellulose by the soda-anthraquinone process (sap) with recovery of the boiling chemicals |
| 04/27/1994 | EP0593638A1 Method and apparatus for separating molten particles from a stream of gas |
| 04/26/1994 | US5306481 Partially reforming heavy liquid hydrocarbons in steam fluidized bed, steam reforming over fixed catalyst bed |
| 04/26/1994 | US5306392 Process for preparing pulp using potassium-based alkaline solution |
| 04/14/1994 | WO1994007797A1 A process for recovering alkali metal hydroxide from organic liquors |
| 04/14/1994 | WO1994007595A1 A process for pelletising particles of alkali metal ferrite |
| 04/14/1994 | CA2146031A1 A process for pelletising particles of alkani metal ferrite |
| 04/14/1994 | CA2145853A1 A process for recovering alkali metal hydroxide from organic liquors |
| 04/12/1994 | US5302246 Method of managing liquid steams in a pulp mill |
| 04/06/1994 | EP0478586B1 Multistage evaporating system |
| 04/06/1994 | CN1084919A Alkali rocovery method from digestive black liquor of alkali process |
| 04/06/1994 | CN1084918A Paper making black liquor processing method and equipment |
| 04/05/1994 | US5300191 Concentrating liquid effluents, incinerating to produce ash, chemically reacting to produce chlorate, reacting to form chlorine dioxide |
| 03/29/1994 | CA1328034C High sulfidity cook for paper pulp using black liquor for sulfonization of steamed chips |
| 03/17/1994 | WO1994005850A1 Method of treating process water |
| 03/17/1994 | WO1994005595A1 Aqueous suspensions of colloidal particles, preparation and use of the suspensions |
| 03/17/1994 | CA2139566A1 Method of treating process water |
| 03/03/1994 | WO1994004747A1 Reduction of chloride in pulping chemical recovery systems |
| 03/02/1994 | EP0584176A1 Process, using enhanced-action laccase enzymes, for the delignification or bleaching of lignocellulose-containing material or for the treatment of waste water |
| 03/02/1994 | EP0584161A1 White liquor preparation and pulping process. |
| 03/02/1994 | CN1083143A Alkaline process paper-making black liquor treatment and comprehensive utilization method |
| 02/22/1994 | US5288857 Reducing sodium content by ion exchange with calcium; precipitating lignin from black liquor derived from various sulfur processes |
| 02/22/1994 | CA2104535A1 Method of producing acids and alkalis |
| 02/22/1994 | CA1327105C Process for disposal of pulp and paper mill sludges containing chlorinated organic compounds |
| 02/17/1994 | WO1994003673A1 Zero discharge pulp mill |
| 02/17/1994 | CA2139842A1 Zero discharge pulp mill |
| 02/16/1994 | CN1082115A Organosolv process for hydrolytic decomposition of lignocellulosic and strach materials |
| 02/08/1994 | US5284550 Producing dry recoverable salts, low calorific gases for papermaking |
| 02/02/1994 | EP0448599B1 A lignin preparation and a method for its manufacture |
| 01/28/1994 | CA2101005A1 Green liquor crystallization |
| 01/20/1994 | WO1994001617A1 Method for filtering a product formed in causticization |
| 01/20/1994 | WO1994001616A1 White liquor oxidation for bleach plant use |
| 01/20/1994 | CA2139766A1 Method for filtering a product formed in causticization |
| 01/18/1994 | CA1326112C Chlorine dioxide oxidation of mill effluent color |
| 01/11/1994 | US5277759 Method of controlling sulfidity of a sulfate cellulose mill |
| 01/11/1994 | CA1325982C Filter bed clarifier |
| 12/23/1993 | WO1993025751A1 Circulating fluidized bed black liquor gasification process and apparatus |
| 12/23/1993 | CA2138408A1 Process and design of a cfb black liquor gasification system operating at low pressures |
| 12/11/1993 | CA2098062A1 Production of cellulose pulp bleaching chemicals |
| 12/09/1993 | WO1993024704A1 A process for recovering chemicals and energy from cellulose waste liquor |
| 12/09/1993 | WO1993024703A1 A process for recovering energy from a combustible gas |
| 12/09/1993 | CA2136829A1 A process for recovering chemicals and energy from cellulose waste liquor |
| 12/09/1993 | CA2136817A1 A process for recovering energy from a combustible gas |
| 12/07/1993 | CA1324865C Method for recovering chemicals from spent pulp liquors |
| 11/25/1993 | WO1993023502A1 Device in a reactor for gasifying spent liquor |
| 11/25/1993 | WO1993023501A1 Device in a reactor for gasifying spent liquor |
| 11/25/1993 | CA2133332A1 Device in a reactor for gasifying spent liquor |
| 11/25/1993 | CA2133210A1 Device in a reactor for gasifying spent liquor |
| 11/18/1993 | EP0569526A1 Pulping of lignocellulosic materials and recovery of resultant by-products |
| 11/11/1993 | WO1993022493A1 Polysulfide production in white liquor |
| 11/11/1993 | WO1993022492A1 Production of cellulose by the soda-anthraquinone process (sap) with recovery of the boiling chemicals |
| 11/11/1993 | WO1993022490A1 Process for the recovery of processing chemicals from the black liquor in the production of cellulose by organo-solvent processes |
| 11/11/1993 | WO1993022243A1 Method for purifying process water or wastewater containing wood resin |
| 11/11/1993 | CA2131377A1 Polysulfide production in white liquor |
| 11/09/1993 | CA1323961C Combustion of black liquor |
| 11/06/1993 | CA2095180A1 Method for purifying process water or wastewater containing wood resin |
| 10/28/1993 | WO1993021118A1 Turbo oxidation system (tos) for 'wet combustion' of cod-containing liquids and for cod-reduction by enzymes |
| 10/28/1993 | CA2117751A1 Turbo oxidation system (tos) for "wet combusion" of cod-containing liquids and for cod-reduction by enzymes |
| 10/19/1993 | US5254286 Composition for controlling scale in black liquor evaporators |
| 10/06/1993 | EP0564443A1 Treatment of bleach plant filtrates |
| 10/02/1993 | CA2093098A1 A method of recovering and reusing sulphur in a sulphate cellulose plant |
| 09/29/1993 | EP0561823A1 Process and device in a chemicals recovery plant in a sulphate pulp mill. |
| 09/22/1993 | CN1076498A Integrated treatment technology for papermaking black liquid and alcohol waste liquid |
| 09/21/1993 | US5246542 Evaporation and recovery process for bleached chemical thermo-mechanical pulp (BCTMP) effluent |
| 09/21/1993 | CA1322366C Continuous leaching of lignin or hemicellulose and lignin from steam pretreated lignocellosic particulate material |
| 09/16/1993 | WO1993018226A1 Combined ozone destruction and fiber scrubbing in paper pulp mills |
| 09/16/1993 | CA2107764A1 Combined ozone destruction and fiber scrubbing in paper pulp mills |
| 09/15/1993 | CN1022081C Method for preparing animal protein fodder by utilizing neutral ammonium sulfite |
| 09/02/1993 | WO1993017179A1 Method and apparatus for improving the safety of a spent liquor recovery boiler |
| 08/25/1993 | EP0557112A1 Chlorine free bleaching and pulping process |
| 08/22/1993 | CA2089516A1 Chlorine free pulping and bleaching sequence |
| 08/19/1993 | DE4303088A1 Homogeneous waste gas prodn. with controlled sulphur di:oxide content |
| 08/10/1993 | US5234546 Polysulfide production in white liquor |
| 08/05/1993 | WO1993015261A1 Pulping of fibrous plant materials and recovery of resultant by-products |
| 08/05/1993 | WO1993014860A1 Separation device and process |
| 08/05/1993 | CA2116544A1 Pulping of fibrous plant materials and recovery of resultant by-products |
| 08/04/1993 | EP0553649A1 Process for delignifying a cellulose pulp |
| 08/04/1993 | EP0474659B1 Two-stage condenser |
| 08/03/1993 | US5231836 Two-stage condenser |
| 08/03/1993 | CA1320911C Purification of effluent from wood pulp bleach plant |
| 08/03/1993 | CA1320865C Method and apparatus for evaporating waste liquor produced when cooking fibrous material containing cellulose |
| 08/01/1993 | CA2088281A1 Process for delignifying raw cellulose |
| 07/27/1993 | US5230773 Process for the recovery of heat and chemicals from spent liquor |
| 07/11/1993 | CA2086781A1 Black liquor treatment |
| 07/08/1993 | WO1993012889A1 Separating arrangement and method for counteracting foam formation |
| 07/07/1993 | EP0550401A1 Processes and apparatus for endothermic reactions |
| 07/07/1993 | CN1073998A Preparation method of alkali soluble lignin for storage battery |