| Patents for D21C 11 - Regeneration of pulp liquors (4,054) |
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| 06/15/1992 | WO1992010264A1 Distillation apparatus |
| 06/11/1992 | WO1992009742A1 Process and device in a chemicals recovery plant in a sulphate pulp mill |
| 06/10/1992 | CN1061820A Process for desilicifying black liquor from straw pulp single-stage paper making |
| 06/09/1992 | US5120448 Removal of aox frm bleach plant mill effluents by ph shift using the alkalinity/acidity sources available at the mill |
| 06/04/1992 | DE4038420A1 White liquor recovery from black liquor from pulping cellulose - by oxidising unreacted sodium sulphide with gas contg. oxygen before combustion |
| 05/26/1992 | CA1301412C Method in the activation of lignocellulosic material with a gas containing nitrogen dioxide |
| 05/12/1992 | US5112441 Wastes from pulping process, concentrated feed for soda ash furnace |
| 04/29/1992 | EP0482148A1 Method for treating mechanical pulp plant effluent |
| 04/08/1992 | EP0478586A1 Multistage evaporating system. |
| 04/08/1992 | CN1060128A Comprehensive treatment for extracting humic acid from paper making black liquor |
| 04/08/1992 | CN1016192B Method for reclaiming chemicals from plasma treatment of pulp waste liquid |
| 04/02/1992 | WO1992005309A1 Process for producing chemical pulp |
| 04/02/1992 | CA2068642A1 Process for the preparation of chemical pulp |
| 04/01/1992 | EP0478528A1 Method and apparatus for beneficiating wastewaters |
| 03/28/1992 | CA2042630A1 Method and apparatus for beneficiating waste-waters |
| 03/25/1992 | EP0477059A2 Impregnation with black liquor prior to white liquor introduction |
| 03/20/1992 | WO1992005118A1 REMOVAL OF AOX FROM BLEACH PLANT MILL EFFLUENTS BY pH SHIFT USING THE ALKALINITY/ACIDITY SOURCES AVAILABLE AT THE MILL |
| 03/18/1992 | EP0475930A1 Gas sparged centrifugal separation and/or mixing |
| 03/18/1992 | EP0474659A1 Two-stage condenser. |
| 03/17/1992 | US5096540 By combined acidification and evaporative concentration |
| 03/04/1992 | EP0472820A2 Continuous solvent pulping and washing processes and apparatus |
| 03/01/1992 | CA2045436A1 Gas sparged centrifugal separation and/or mixing |
| 02/25/1992 | CA1296144C Method for methylolation of lignin materials |
| 02/19/1992 | CN2096577U Double spiral pulp machine |
| 02/18/1992 | US5089087 After flashing, heated concentrated black liquor supplies heat for evaporation; simplification, efficiency |
| 02/18/1992 | US5089086 Process for continuous cooking of cellulose |
| 02/18/1992 | CA2042885A1 Continuous solvent pulping and washing processes and apparatus |
| 01/29/1992 | EP0468016A1 Process for preparing kraft pulp. |
| 01/22/1992 | EP0466752A1 A process for treating a fiber pulp with a chemical solution. |
| 01/21/1992 | US5082526 Oxidation the kraft green liquor mixed with sodium hydroxide t o kraft white liquor and convert sodium sulfide to sodium poly sulfide |
| 01/14/1992 | US5080756 Kraft pulping process with spent sulphuric acid addition to strong black liquor |
| 01/14/1992 | US5080755 Process for the continuous digestion of cellulosic fiber material |
| 01/01/1992 | CN1057500A Process for partial combustion of cellulose spent |
| 12/25/1991 | CN1057324A Process for partial combustion of cellulose spent liquor ii |
| 12/25/1991 | CN1057306A Purification of process gas from partial combustion of black liquor |
| 12/18/1991 | CN1057079A Treatment of black liquor from paper mill by coacervation and precipitation |
| 12/12/1991 | WO1991019042A1 Process for the preparation of an aqueous solution of sodium compounds |
| 12/12/1991 | WO1991019041A1 Process for the partial combustion of cellulose spent liquor ii |
| 12/12/1991 | WO1991018863A1 Process for the recovery of aliphatic acids and sugars |
| 12/05/1991 | CA2021240A1 Method for recycling sulfur dioxide from sulfite pulping liquors |
| 12/04/1991 | EP0459963A1 Process for partial combustion of cellulose spent liquor |
| 12/04/1991 | EP0459962A1 Purification of process gas from a partial combustion of black liquor |
| 12/01/1991 | CA2043538A1 Purification of process gas from a partial combustion of black liquor |
| 11/14/1991 | WO1991017307A1 Bleaching of chemical pulp |
| 11/09/1991 | WO1991017395A1 An apparatus for detecting carryover particles in the interior of a furnace |
| 11/06/1991 | CN1055974A Non-pollution technology for comprehensive utilization of alkaline straw-pulp black liquid |
| 11/05/1991 | US5062921 Method for regulating the feed or combustion conditions of concentrated waste liquors in a soda recovery unit |
| 10/30/1991 | EP0454642A1 Reduction of halogenated organic compounds in spent bleach liquor |
| 10/29/1991 | US5061343 Sodium hydroxide and lignin from kraft pulping |
| 10/22/1991 | US5059404 Pulse combustor, resonant tubes, fluidized particles |
| 10/12/1991 | WO1991015628A1 Method for treating mechanical pulp plant effluent |
| 10/12/1991 | CA2059297A1 Method for treating mechanical pulp plant effluent |
| 10/08/1991 | US5055279 Process for the reduction of emissions of sulphur dioxide and/or oxides of nitrogen in the case of combustion processes |
| 10/04/1991 | WO1991015665A1 Method and apparatus for generating heat and electricity in a sulphate pulp mill |
| 10/04/1991 | CA2079476A1 Method and apparatus for generating heat and electricity in a sulphate pulp mill |
| 10/03/1991 | WO1991014824A1 Membrane separation process |
| 10/01/1991 | US5053108 High sulfidity cook for paper pulp using black liquor sulfonization of steamed chips |
| 09/18/1991 | CN1013974B Treatment for paper making black liquor and comprehensive utilizing method |
| 09/18/1991 | CN1013973B Process for preparation of potassium salts from pulping of lignocellulosic materials |
| 09/10/1991 | US5047119 Method of stabilizing white liquor flow in the causticizing of green liquor from a kraft paper plant |
| 09/10/1991 | CA1288553C Process for recovering energy and chemicals in pulping processes |
| 09/04/1991 | CN1054280A Recovery apparatus by digesting waste gas to extract and separate raw black liquid |
| 09/03/1991 | CA1288532C Method of removing macromolecular organic dissolved and colloidal material from wood processing industry effluents |
| 09/03/1991 | CA1288203C Method of decreasing black liquor viscosity |
| 08/27/1991 | CA2023817A1 System and apparatus for recovery of turpentine from thermomechanical pulping process |
| 08/22/1991 | WO1991012368A1 Process for preparing kraft pulp |
| 08/08/1991 | WO1991012301A1 Process in thermal decomposing a carbonaceous raw material and reactor for carrying out the process |
| 08/08/1991 | DE4101020A1 Verfahren und reaktor zur wiedergewinnung von energie und chemikalien aus ablauge Method and reactor for the recovery of energy and chemicals from waste liquor |
| 08/08/1991 | CA2075372A1 Process in thermal decomposing a carbonaceous raw material and reactor for carrying out the process |
| 07/23/1991 | US5034094 Method of converting inorganic materials from kraft pulping liquor into pulping chemicals without passing them through a recovery furnace |
| 07/23/1991 | CA1286456C Method for green liquor cleaning in sulphate pulp mills |
| 07/09/1991 | CA2033713A1 Apparatus and method for recovery of constituents and heat from fluidized bed combustion |
| 07/02/1991 | CA1285354C Chemical recovery process |
| 07/02/1991 | CA1285353C Process for the preparation of sulphide-free alkali liquor |
| 06/19/1991 | CN1052347A Method for reclaiming chemicals from plasma treatment of pulp waste liquid |
| 06/13/1991 | WO1991008337A1 A process for the preparation of cooking liquors having high sulphidity for sulphate pulp cooking |
| 06/12/1991 | EP0431337A1 Process for the desilication of waste liquid |
| 06/11/1991 | US5022962 Method for the treatment of spent liquors in pulp production |
| 06/05/1991 | CN1051953A Process for preparation of cooking liquors having high sulphidity for sulphate pulp cooking |
| 06/05/1991 | CN1051952A Preparing method of water pulp by treating and utilizing neutral imine method |
| 05/28/1991 | CA1284491C Procedure for separating lignin and phenol from phenol solutions |
| 05/07/1991 | US5013825 Sulfation of lignin |
| 05/07/1991 | US5013454 Method of removing organic substances from effluents from pulp and paper manufacturing processes |
| 05/07/1991 | US5012750 Apparatus for recovery of constituents and heat from fluidized bed combustion |
| 05/07/1991 | CA1283760C Process for the recovery of heat and chemicals from spent liquor |
| 05/01/1991 | CN1051063A Continuous treatment system of waste paper pulp liquors |
| 04/30/1991 | US5010827 Apparatus for detecting carryover particles in the interior of a furnace |
| 04/30/1991 | CA1283512C Sulfite cooking method for the production of cellulose from materials containing lignocellulose with recovery of the cooking chemicals |
| 04/23/1991 | CA1283257C Apparatus for automatically cleaning smelt spouts of a chemical recoveryfurnace |
| 04/23/1991 | CA1283256C Method of recovering caustic soda from spent pulping liquors |
| 04/18/1991 | WO1991005104A1 Isolation of lignin from solvent pulping liquors |
| 04/09/1991 | US5006211 Electrodialylic water splitting process for the treatment of aqueous electrolytes |
| 04/03/1991 | EP0420771A1 Isolation of lignin from solvent pulping liquors |
| 04/02/1991 | CA1282210C Process for recovering sodium hydroxide from an alkaline pulp wasteliquor |
| 03/27/1991 | CN1050241A Lignin separator and purifying technique for black liquor |
| 03/27/1991 | CN1050240A Trentment agent and method for paper making black liquor |
| 03/20/1991 | CN1050064A Acidifying process of paper black liquid with sulphur dioxide |
| 03/19/1991 | CA1281714C Procedure for recirculating phenol in a lignocellulosic materials digestion process |
| 03/12/1991 | CA1281274C Radial configuration of evaporator heating elements |
| 03/12/1991 | CA1281153C Process for the activation and delignification of cellulose pulp |