| Patents for D21C 11 - Regeneration of pulp liquors (4,054) |
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| 07/20/2000 | WO2000042251A1 Method of reducing the silicon content of green liquor |
| 07/19/2000 | CA2296289A1 Method and apparatus for separating soap |
| 07/18/2000 | US6090240 Method of inhibiting scaling in black liquor evaporators |
| 07/18/2000 | CA2219058C Method of treating chlorine dioxide |
| 07/15/2000 | CA2295786A1 Removal of anthraquinone from tall oil and tall oil fractions |
| 07/12/2000 | EP1018486A1 Method for producing polysulfide by electrolytic oxidation |
| 07/12/2000 | CN1259600A Alkali recovery from paper making black liquor by wet method |
| 07/11/2000 | US6086712 DOM control in cellulose pulp production |
| 07/05/2000 | CN1258776A Paper-making black liquor and paper-making water treating process |
| 07/04/2000 | US6084061 Removal of anthraquinone from tall oil and tall oil fractions |
| 06/28/2000 | EP0617747B2 A method of preparing digesting liquor |
| 06/28/2000 | CN1257952A Process for dissolving alkali by flushing with hot liquid on inclined plate |
| 06/23/2000 | CA2256923A1 Kraft pulping process |
| 06/21/2000 | EP1010805A1 Calcium removal in pulping |
| 06/21/2000 | CN1257140A Solidifying treatment technology for black liquor in paper industry |
| 06/20/2000 | CA2148232C Method for acidification of soap with sodium bisulphite solution |
| 06/15/2000 | WO2000034569A1 A method of cleaning sulfide contaminated condensates |
| 06/15/2000 | WO2000034568A1 Method of obtaining alpha dissolving pulp from chips |
| 06/14/2000 | EP0991809A4 Process for treating spent, waste, alkaline digestion liquor from paper pulping operations and product |
| 06/14/2000 | CN2382745Y Concentrator for pulp black liquor |
| 06/14/2000 | CN1256253A Biological acid process for separating lignin from alkaline paper-making black liquor |
| 06/13/2000 | US6074521 Method of separating impurities from lime and lime sludge |
| 06/07/2000 | EP1005586A1 Method for the recovery of formic acid |
| 06/06/2000 | US6071380 Method of papermaking having zero liquid discharge |
| 06/06/2000 | US6071377 Ammonia is supplied to the combustion air which is then supplied to the recovery boiler, as the final portion, at a high level, so that a reducing atmosphere is created in a very large part of the recovery boiler and for a long time |
| 06/06/2000 | US6070655 Heat exchanger |
| 05/30/2000 | US6068730 Liquid distributor for evaporator |
| 05/25/2000 | WO2000029666A1 Recovery boiler salt-cake injection method and apparatus |
| 05/18/2000 | WO2000028136A1 Method of producing process steam from a black liquor |
| 05/18/2000 | WO2000028135A1 Black liquor processing |
| 05/18/2000 | CA2289325A1 Heat economy enhancements for the recovery and use of energy obtained from spent cooking liquors |
| 05/17/2000 | CN1253257A Integrated process for treating boiler fume and paper-making black liquid and its products |
| 05/16/2000 | US6063238 Black liquor impregnation in digester |
| 05/16/2000 | US6062547 Quench vessel for recovering chemicals and energy from spent liquors |
| 05/09/2000 | US6059925 Method to regenerate gas mixture in ozone-bleaching process |
| 05/02/2000 | US6057438 Process for the co-production of dissolving-grade pulp and xylan |
| 05/02/2000 | CA2207658C Electromembrane processes for the treatment of kraft mill electrostatic precipitator catch |
| 04/19/2000 | CN1251147A Method for preparing alkaline solutions contg. aromatic polymer |
| 04/19/2000 | CN1250833A Process for treating black paper-making liquid |
| 04/19/2000 | CN1250832A Process for treating black paper-making liquid |
| 04/13/2000 | WO2000020679A1 Method for separating reduced sulphur compounds from concentrated odour gases of a pulp mill |
| 04/12/2000 | EP0991809A1 Process for treating spent, waste, alkaline digestion liquor from paper pulping operations and product |
| 04/12/2000 | EP0975645A4 Separating lignin solids and black liquor |
| 04/12/2000 | CN1250123A Black liquor treating and caustic soda recovering method for crop stalk pulping process |
| 04/05/2000 | CN1249374A Process for preparing sodium xylose from paper-making black liquor and recovering caustic soda by dry combustion |
| 04/05/2000 | CN1249373A Process for removing lignin from black liquor in making paper by soda pulping |
| 03/30/2000 | WO2000017444A1 Pulping process without a recovery furnace |
| 03/30/2000 | CA2345394A1 Pulping process without a recovery furnace |
| 03/29/2000 | EP0714496B1 Device for manoeuvring an air-control mechanism in a furnace |
| 03/29/2000 | CN2371182Y Automation device for papermaking black liquor regenerating resources |
| 03/29/2000 | CN1248652A Resource type treating method for waste liquor in alkaline process paper making |
| 03/29/2000 | CN1248519A Board material using black liquor in paper industry and crops stalk as raw material and making method thereof |
| 03/22/2000 | CN1247915A Acidifying sulfate pulp-making process |
| 03/22/2000 | CN1050527C Process and apparatus for absorbing hydrogen sulphide |
| 03/21/2000 | US6039837 Ozone bleaching waste liquor is mixed with waste liquor from an alkaline treatment stage, to obtain neutral solution, cooling to precipitate sodium sulfate, separating and dissolving in water, performing electrolysis |
| 03/14/2000 | US6036355 Reactor mixing assembly |
| 03/09/2000 | WO2000012811A1 Screening of fibrous suspensions |
| 03/09/2000 | WO2000012436A1 Process for the inhibition of scale in harsh systems and novel antiscalants for same |
| 03/09/2000 | CA2341535A1 Screening of fibrous suspensions |
| 03/09/2000 | CA2340057A1 Process for the inhibition of scale in harsh systems and novel antiscalants for same |
| 03/02/2000 | WO2000011263A1 Method of preventing scaling |
| 03/02/2000 | WO1999055627A9 Stable oxidizing bromine formulations, methods of manufacture thereof and methods of use for microbiofouling control |
| 03/01/2000 | CN1245845A Closed control method of paper-making waste water |
| 02/29/2000 | US6030493 Spent liquor is gasified in at least two reactors, a first and a second stream of solid and/or smelt material and of combustible gaseous material being formed, the formed process chemicals being returned to reactors |
| 02/22/2000 | US6027609 For producing liquors containing different concentrations of recovered process chemicals or combustion gases containing different concentrations of process chemicals from a spent liquor obtained in the production of pulp |
| 02/16/2000 | CN1244608A Straw pulp alkali recovering evaporator |
| 02/16/2000 | CN1244500A Extraction process to separate organic matter from inorganic salt |
| 02/16/2000 | CN1244438A Scale preventing method for the concentration process of solution or liquid mixture |
| 02/15/2000 | US6024833 Precipitating undesirable metals from pulp mill, spent liquors |
| 02/15/2000 | US6024028 Protection of the air ports of a recovery boiler |
| 02/09/2000 | EP0977919A1 Separating alkali metals from gasified black liquor |
| 02/09/2000 | CN2362885Y Sewage purifier |
| 02/02/2000 | EP0975645A1 Separating lignin solids and black liquor |
| 01/27/2000 | WO1999055627A8 Stable oxidizing bromine formulations, methods of manufacture thereof and methods of use for microbiofouling control |
| 01/20/2000 | WO2000003083A1 A process for concentrating soluble and colloidal substances in process waters |
| 01/20/2000 | CA2337411A1 A process for concentrating soluble and colloidal substances in process waters |
| 01/13/2000 | WO2000001879A1 Method an arrangement for cleaning contaminated condensate including a combined stripper/condenser |
| 01/12/2000 | EP0970275A1 Method for preparing alkaline solutions containing aromatic polymers |
| 01/12/2000 | EP0970020A1 Process for treating wastewater |
| 01/12/2000 | CN1240767A Process for treating waste paper-making liquor |
| 12/29/1999 | CN1239932A Process for preparing calcium carbonate |
| 12/29/1999 | CN1239931A Process for preparing calcium carbonate |
| 12/28/1999 | US6007726 Stable oxidizing bromine formulations, methods of manufacture thereof and methods of use for microbiofouling control |
| 12/23/1999 | WO1999066119A1 Arundo donax pulp, paper products, and particle board |
| 12/23/1999 | CA2339064A1 Arundo donax pulp, paper products, and particle board |
| 12/22/1999 | CN1239166A Process for causticizing green solution of alkali recovered from black liquid of paper-making |
| 12/22/1999 | CN1047640C Method of producing sulphate pulp through steamed and pulverized cellulose fiber |
| 12/21/1999 | US6004364 Separation device |
| 12/15/1999 | EP0756511B1 Method for fractionating a solution |
| 12/15/1999 | EP0692044B1 Method for reusing spent gas from an ozone bleaching reactor |
| 12/09/1999 | WO1999063152A1 Increasing causticizing efficiency of alkaline pulping liquor by borate addition |
| 12/09/1999 | WO1999063151A1 Partial autocausticization of alkali liquors for wood pulping processes |
| 12/09/1999 | WO1999062818A1 Method for producing polysulfide by electrolytic oxidation |
| 12/07/1999 | CA2179425C Process for treating gas emissions from a kraft process with undecylenic and/or undecynoic acid |
| 11/30/1999 | US5993601 Process for producing polysulphide by means of oxidizing sulphide in spent liquors from kraft cellulose cooking |
| 11/30/1999 | US5992337 Methods of improving productivity of black liquor recovery boilers |
| 11/23/1999 | US5989394 Supplying contaminated condensate obtained by papermaking to stripper device having an acidifier added above the intake so that malodorous gases are efficiently driven off from stripper |
| 11/23/1999 | US5989387 Burning within recovery boiler the odorous sulfur gases and black liquor generated from cellulose sulfate process, reacting product sulfur oxides with vaporized sodium chloride and water, scrubbing product hydrogen chloride from flue gas |
| 11/17/1999 | CN2349243Y Straw pulp base recovery evaporator |
| 11/16/1999 | US5985367 Rice grain or spindle shaped precipitated calcium carbonate pigment; calcium oxide slaked with white liquor; causticizing; ink drying |