| Patents for D21C 11 - Regeneration of pulp liquors (4,054) |
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| 06/24/1993 | WO1993012288A1 A method of preparing digesting liquor |
| 06/10/1993 | WO1993011297A1 Method of recovering energy from waste liquors from pulp processes |
| 06/03/1993 | CA2083899A1 Method of and an apparatus for recovering sulphur dioxide from the chemical circulation of a sulphate pulp mill |
| 05/27/1993 | WO1993010416A1 A heat exchanger |
| 05/26/1993 | EP0543646A1 Method and apparatus for use in monitoring a smelt bed or kraft process chemical recovery furnace |
| 05/26/1993 | EP0543135A1 Selective white liquor oxidation |
| 05/25/1993 | US5213663 Method for controlling the sodium carbonate concentration of green liquor in the dissolving tank |
| 05/25/1993 | US5213662 Treatment of chips with high temperature black liquor to reduce black liquor viscosity |
| 05/19/1993 | CA2083118A1 Heat exchanger |
| 05/18/1993 | US5211002 Process and an equipment for the recovery of energy and chemicals in a sulphate process |
| 04/28/1993 | EP0538576A1 Process for recovery of chemicals from the pulping liquor |
| 04/27/1993 | US5205908 Purification of process gas from a partial combustion of black liquor |
| 04/20/1993 | US5204069 Nozzles, to direct steam jet, secured to articulating anchor mount |
| 04/14/1993 | CN1070894A Mixing-ultra filtering method treating system for cotton size black fluid |
| 04/13/1993 | US5201172 Method for treating black liquor |
| 04/12/1993 | WO1993007333A1 Method of treating wastewater in pulp bleaching |
| 04/12/1993 | CA2098279A1 Method for treating liquid waste after pulp bleaching |
| 04/01/1993 | WO1993006298A1 A method of producing sodium hydroxide |
| 04/01/1993 | WO1993006297A1 A method in ozone bleaching of pulp |
| 04/01/1993 | CA2116974A1 A method in ozone bleaching of pulp |
| 03/31/1993 | EP0533733A1 Process for the partial combustion of cellulose spent liquor ii. |
| 03/28/1993 | CA2078934A1 Method of treating material containing sodium sulphate and/or sodium carbonate in a pulp mill |
| 03/27/1993 | CA2078959A1 Method of and apparatus for treating malodorous gases |
| 03/18/1993 | WO1993005228A1 Method for the combustion of waste liquids |
| 03/17/1993 | EP0532491A1 Treatment of organic sulfur gases especially in kraft pulping systems and processes |
| 03/17/1993 | CN1070022A Method for extracting akaline lignin dry powder from paper-making black likquid |
| 03/11/1993 | CA2060819A1 Treatment of organic sulfur gases especially in kraft pulping systems and processes |
| 03/09/1993 | US5192396 Process for the continuous digestion of cellulosic fiber material |
| 03/04/1993 | WO1993004000A1 Production of sodium hydroxide |
| 03/04/1993 | WO1993003815A1 Method for the manufacture of tall oils |
| 03/04/1993 | CA2115762A1 Method for the manufacture of tall oils |
| 03/03/1993 | EP0428564B1 Process and apparatus for generating steam |
| 03/03/1993 | CN1069538A New technology for treating black liquid of straw pulp paper-making by alkali bucking method |
| 02/17/1993 | EP0527294A1 Treatment of chips with black liquor |
| 02/16/1993 | CA1313577C Low temperature recovery of kraft black liquor |
| 02/15/1993 | CA2068165A1 Treatment of chips with black liquor |
| 02/10/1993 | CN1068867A Method for treating paper-making black liquor |
| 02/04/1993 | WO1993002249A1 Method for recovery of chemicals and energy from spent liquor |
| 02/04/1993 | WO1993001890A1 Method and apparatus for separating molten particles from a stream of gas |
| 02/04/1993 | CA2113559A1 Method and apparatus for separating molten particles from a stream of gas |
| 02/04/1993 | CA2112563A1 Method for recovery of chemicals and energy from spent liquor |
| 02/03/1993 | CN1068613A Treating method for black and white liquor of coda pulp |
| 02/02/1993 | US5183535 Process for preparing kraft pulp using black liquor pretreatment reaction |
| 02/01/1993 | CA2074333A1 Single-stage slaking and causticizing method |
| 01/27/1993 | EP0524743A1 Method for controlling the sodium carbonate concentration of green liquor in the dissolving tank |
| 01/20/1993 | EP0523105A1 Method and apparatus for generating heat and electricity in a sulphate pulp mill. |
| 01/20/1993 | CN1068161A Removing lignin and bleaching for lignin cellulose-containing material and method for treating waste water by synergetic shellac enzyme |
| 01/14/1993 | DE4221404A1 Controller for operating combustion plant for pulp digester waste liquor - to maximise recovery of sulphur di:oxide and active magnesia from bi:sulphite process, includes ash analyser, and combustion air regulator |
| 01/13/1993 | EP0522334A1 A method of treating BCTMP/CTMP wastewater |
| 01/12/1993 | US5178770 Method of treating bctmp/ctmp wastewater |
| 01/12/1993 | CA1312420C Kraft pulping process |
| 01/07/1993 | EP0521443A1 Combustion plant for the spent liquor of a pulp digester with a control device for the drop size of the sprayed liquor |
| 12/30/1992 | EP0520452A1 Batch process for preparing kraft pulp |
| 12/30/1992 | CN1067437A Water-soluble resin and preparing process thereof |
| 12/29/1992 | US5174860 Low temperature recovery of kraft black liquor |
| 12/29/1992 | US5174859 Freezing effluent stream, separating and recycling frozen product |
| 12/16/1992 | EP0517716A1 Membrane separation process |
| 12/16/1992 | CN1067080A Low-loss and energy-saving recovery and steam-boiling technology for chemically making non-wooden pulp |
| 12/15/1992 | US5171405 Reactor having a discontinuous conduit means between surfaces of a downwardly extending stationary spiral |
| 12/09/1992 | EP0517689A1 Multi-level sulfide content |
| 12/09/1992 | EP0517453A1 Controlling scale in black liquor evaporators |
| 12/09/1992 | CN2124050U Fog film contact evaporating concentrating apparatus |
| 12/08/1992 | CA1311236C Supercritical separation process for complex organic mixtures |
| 12/02/1992 | CN1019322B Process for recovering waste alkali and its apparatus |
| 12/01/1992 | WO1992021815A1 Method of recovering energy and chemicals from a spent liquor |
| 12/01/1992 | CA2102604A1 Method of recovering energy and chemicals from a spent liquor |
| 12/01/1992 | CA2070078A1 Controlling scale in black liquor evaporators |
| 11/26/1992 | WO1992020856A1 White liquor preparation and pulping process |
| 11/19/1992 | DE4137761A1 Verfahren zur delignifizierung von lignocellulosehaltigem material, bleiche und behandlung von abwaessern mittels laccasen mit erweiteter wirksamkeit Process for the delignification of lignocellulosic material, pale and treatment of wastewater by means of laccases with extended effectiveness |
| 11/18/1992 | WO1992020857A1 Process, using enhanced-action laccase enzymes, for the delignification or bleaching of lignocellulose-containing material or for the treatment of waste water |
| 11/18/1992 | CA2103260A1 A process for the delignification of material containing lignocellulose, bleaching and treatment of white water by means of laccases with extended efficiency |
| 11/17/1992 | US5164480 Method for the manufacture of tall oils |
| 10/29/1992 | WO1992018690A1 Method of recovering energy from waste liquors from pulp processes |
| 10/22/1992 | DE4117049A1 Recycling lye extracted from cellulose@ mfg. plant - has recycling system incorporated to separate valuable material from lye for re-use in plant |
| 10/21/1992 | EP0399999B1 Method for green liquor cleaning in sulphate pulp mills |
| 10/01/1992 | WO1992016688A1 Method of firing black liquor in recovery boilers and a recovery boiler for firing black liquor |
| 09/30/1992 | CN1018465B Recovery apparatus by digesting waste gas to extract and separate raw black liquid |
| 09/29/1992 | CA1307879C A method for purifying resin-containing waste liquor in the manufacture of cellulose pulps |
| 09/29/1992 | CA1307878C Process of decreasing the tendency to form deposits in plants for evaporating spent sulfite liquors |
| 09/22/1992 | US5149442 Maintaining pH; degradation by reinforcement with peroxide |
| 09/09/1992 | EP0502052A1 A process for the preparation of cooking liquors having high sulphidity for sulphate pulp cooking. |
| 09/09/1992 | CN1064225A Cod and chromaticity adsorbent and its producing method |
| 09/08/1992 | US5145556 To produce calcium carbonate, clarification |
| 09/02/1992 | CN1064118A Process and equipment for recovery of energy and chemicals in sulphate process |
| 09/01/1992 | US5143702 Two stage white liquor oxidation apparatus |
| 09/01/1992 | US5143579 Fuel for soda recovery boilers |
| 08/15/1992 | CA2061108A1 Process and an equipment for the recovery of energy and chemicals in a sulphate process |
| 08/11/1992 | US5137643 Continuous soap skimmer |
| 08/08/1992 | WO1992013804A1 Continuous soap skimmer |
| 08/07/1992 | WO1992013994A1 A method of recovering energy and chemicals from black liquor |
| 08/02/1992 | WO1992013849A1 Pulping of lignocellulosic materials and recovery of resultant by-products |
| 08/02/1992 | CA2101754A1 Pulping of lignocellulosic materials and recovery of resultant by-products |
| 07/29/1992 | CN2111307U Atmospheric recovering device for papermaking boil down waste heat |
| 07/28/1992 | US5133831 Method of concentrating black liquor by evaporation |
| 07/15/1992 | EP0494399A1 Process to direct and treat production waters in a paper factory with installation for treatment of waste paper |
| 07/07/1992 | US5127992 Elimination of bleach effluents |
| 06/25/1992 | WO1992010265A1 Distillation apparatus |
| 06/17/1992 | CN2107483U Small paper making black liqour treating device |
| 06/17/1992 | CN1017077B Acidifying process of paper black liquid with sulphur dioxide |
| 06/16/1992 | CA1303399C Method for regulating working pressure during production of mechanical pulp |