| Patents for D21C 11 - Regeneration of pulp liquors (4,054) |
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| 11/16/1999 | US5984987 Spraying black liquor into enclosed zone above surface of turbulent molten salt pool, drying with hot gases rising from surface of pool, dispersing resulting solid particles falling into pool, converting into combustible gas and reduced melt |
| 11/11/1999 | WO1999057365A1 Apparatus and method for the pressurized scrubbing of total reduced sulphur compounds from kraft pulp mill non-condensible gases |
| 11/10/1999 | EP0954632A1 A process for the separation of sulphides from pulping liquors using amphoteric resins |
| 11/10/1999 | CN1234464A Dry powder pepared by paper-making black liquor, preparation method and use in treating pollution |
| 11/09/1999 | US5980717 Burning spent liquor; dissolving precipitated dust in liquid and treating with inorganic ion exchange material to remove potassium |
| 11/04/1999 | WO1999055627A1 Stable oxidizing bromine formulations, methods of manufacture thereof and methods of use for microbiofouling control |
| 11/04/1999 | CA2329896A1 Stable oxidizing bromine formulations, methods of manufacture thereof and methods of use for microbiofouling control |
| 11/03/1999 | EP0953544A1 Process for preparing calcium carbonate |
| 11/03/1999 | EP0776394B1 Enhancements in pulping with dissolved solids control |
| 11/03/1999 | CN1233688A Compresion, diffusion and replacement union pulp washing machine |
| 11/02/1999 | US5976321 Process for making sulfur enhanced undigested cellulosic fiber material and pulp |
| 11/02/1999 | US5976319 Disrupting the flow from the smelt spout of a recovery boiler |
| 11/02/1999 | US5976318 Method for burning secondary sludge in a recovery boiler |
| 10/27/1999 | EP0952208A2 High efficiency method for obtaining an unsaponifiable fraction from black-liquor soaps or crude tall oil |
| 10/27/1999 | CN2345574Y Counter and consequent three net formed paper making machine without waste water |
| 10/27/1999 | CN2345573Y Spraying and evaporating separation device for paper-making black liquor |
| 10/26/1999 | US5972197 High yield electrolysis of sulfide ions within compartment of an electrolytic cell provided with a porous anode having carbon surface; pulp process cooking liquor |
| 10/26/1999 | US5972165 Method of producing oxidized white liquor using dregs containing carbon particles |
| 10/23/1999 | CA2270016A1 Treating methanol-containing waste gas streams |
| 10/21/1999 | WO1999053133A1 Treatment of filtrates from peroxide bleaching of pulp |
| 10/21/1999 | CA2325738A1 Treatment of filtrates from peroxide bleaching of pulp |
| 10/20/1999 | EP0950136A1 Treatment of bleach plant filtrates with oxygen |
| 10/20/1999 | EP0843757B1 Method for reprocessing an ozone-containing gas present in a pulp bleaching plant |
| 10/13/1999 | EP0949201A1 Process for preparing calcium carbonate |
| 10/13/1999 | CN2343190Y Extractor for high-concentrated black liquor |
| 10/07/1999 | DE19814385C1 Verfahren und Vorrichtung zur Prozeßführung und zur Prozeßoptimierung der Chemikalienrückgewinnung bei der Herstellung von Zellstoff Method and apparatus for process management and for process optimization of the recovery of chemicals in the production of pulp |
| 10/06/1999 | EP0947625A1 Process and apparatus for controlling and optimizing the process of chemical recovery during cellulose production |
| 10/05/1999 | US5961941 Production of precipitated calcium carbonate from papermaking sludge and sludge-derived ash |
| 10/05/1999 | US5961803 Leaching process |
| 10/05/1999 | US5961781 Process for recovering heat energy by condensation of vapor and dilution of sodium hydroxide using a condensing heat exchanger scrubbing system |
| 09/30/1999 | WO1999049129A1 A method and plant for the continuous extraction, from a woody material, of a tannic substance contained therein and for the production of a usable lignocellulosic material |
| 09/29/1999 | EP0738343B1 A method of recovering energy and chemicals from black liquor |
| 09/23/1999 | WO1999047746A1 Method of reducing nox compounds in flue gases of recovery boiler |
| 09/23/1999 | WO1999047745A1 Method for reducing emissions of detrimental nitrogen compounds of pulp mill |
| 09/22/1999 | EP0652991B2 Zero discharge pulp mill |
| 09/22/1999 | CN1229156A Double-retrieving of lignin and alkali from papermaking black liquor |
| 09/21/1999 | CA2162191C Process for removing sodium chloride and potassium salts from ash collected from a soda recovery boiler |
| 09/16/1999 | WO1999046443A1 Method of papermaking having zero liquid discharge |
| 09/14/1999 | CA2117368C Separation device and process |
| 09/10/1999 | WO1999045192A1 Method for treating process water |
| 09/10/1999 | CA2322209A1 Method for treating process water |
| 09/01/1999 | EP0938607A1 Segmented smelt spout |
| 09/01/1999 | CN1227297A Method for treating waste water containing black liquid of paper-making |
| 09/01/1999 | CN1044929C Method of separating sulphur compounds |
| 08/31/1999 | US5944951 Method for reusing spent gas from an ozone bleaching reactor |
| 08/31/1999 | US5944950 Process for the final evaporation of black liquor |
| 08/26/1999 | WO1999042526A1 Lignin based colloidal compositions |
| 08/26/1999 | CA2321735A1 Lignin based colloidal compositions |
| 08/25/1999 | EP0937813A2 Enhancement in pulping with dissolved solids control |
| 08/24/1999 | US5942084 Process for the separation of sulphides from pulping liquors using amphoteric resins |
| 08/18/1999 | EP0935694A1 Process for purifying ash which principally consists of sodium sulphate from a recovery boiler |
| 08/17/1999 | US5938892 Recycling filtrate from oxidative extraction stage countercurrently through bleaching plant and brown stock washing; also recycling filtrate from first chlorine dioxide bleaching stage contercurrently through brown stock washing |
| 08/12/1999 | WO1999040034A1 Use of reverse osmosis membranes to treat evaporator clean condensate |
| 08/11/1999 | EP0737260B1 Economizer of a recovery boiler |
| 08/05/1999 | WO1999019561B1 A method for black liquor gasification in recovery boilers |
| 07/29/1999 | WO1999037853A1 Method for processing of alkaline condensate emanating from the manufacture of cellulose pulp |
| 07/28/1999 | EP0931195A1 Evaporation apparatus for evaporation of liquids, such as spent liquor from pulp cooking |
| 07/20/1999 | US5925216 Method of continuous pulping in a digester with high black liquor usage in the impregnation stage |
| 07/14/1999 | CN1222414A Method of comprehensive utilization of paper-making black liquor, fume and flyash to form environment-protecting good circulation |
| 07/13/1999 | US5922172 Supplying evaporated black liquor and lime sludge to the furnace cavity to regulate the temperature of furnace so that lime sludge is partially calcined to calcium oxide lime sludge giving calcium sulfide in the smelt |
| 07/13/1999 | US5922171 Collecting pulping chemicals form process loop and treating to remove sodium chloride in an ion exchange unit comprising amphoteric ion exchange resin; returning treated chemicals to process loop |
| 07/07/1999 | EP0927278A1 Process and apparatus for controlling the efficiency of causticizing process |
| 07/07/1999 | CN2327716Y Extractor for black liquor of paper making process |
| 07/06/1999 | US5919424 Extracting calcium from an aqueous mixture |
| 06/23/1999 | CN1220331A Extraction and equipment for centrifugal blowing type paper-making pulping cooking waste liquor |
| 06/15/1999 | US5911854 Method of purifying electric precipitator ash using a pressure filter |
| 06/15/1999 | US5911853 Carbon dioxide is injected in condensate stream under pressure, then reduced rapidly to a pressure sufficient to cause hydrogen sulfide and volatile mercaptans to pass from the condensate to a gas phase |
| 06/09/1999 | EP0721527B1 Preparation of cooking liquor containing sulphite |
| 06/03/1999 | WO1999027180A1 Method and device for removal of soda melt from a soda recovery unit |
| 06/03/1999 | WO1999027179A1 Method for bleaching cellulose in a closed system using caro's acid |
| 06/02/1999 | CN1218125A Method for glass production by using black liquid |
| 06/02/1999 | CN1043537C Aqueous suspensions of colloidal particles, preparation and use of the suspensions |
| 06/01/1999 | US5908532 Method of converting chlorine dioxide present in a gaseous stream from a pulp bleach plant by irradiation to chlorine |
| 05/26/1999 | CN2320651Y Defibering separator for pollution-less paper-making |
| 05/26/1999 | CN2320650Y Double-roller pressing de-watering machine |
| 05/26/1999 | CN1217403A Process for recovering alkali and energy from black liquor containing silicate |
| 05/25/1999 | US5907066 Treating methanol-containing waste gas streams |
| 05/18/1999 | US5904807 Liquid distributor for an evaporator |
| 05/18/1999 | US5904753 Separation device and process |
| 05/18/1999 | CA2178044C Method of producing chlorine dioxide |
| 05/18/1999 | CA2152016C Method for the manufacture of cooking liquors by green liquor crystallization |
| 05/14/1999 | WO1999023481A1 Method for measuring the properties of the stack and the corrosion of materials in a soda recovery unit |
| 05/12/1999 | CN2318253Y Net-type papermaking black liquor extraction machine |
| 05/06/1999 | EP0792395B1 Method to regenerate gas mixture in ozone-bleaching process |
| 05/06/1999 | EP0399999B2 Method for green liquor cleaning in sulphate pulp mills |
| 05/04/1999 | US5900112 Papermaking |
| 05/04/1999 | CA2123987C A method of preparing digesting liquor |
| 04/29/1999 | WO1999020827A1 Process system and method for preliminary treatment of disintegrated cellulose-containing material prior to pulp digestion |
| 04/27/1999 | CA2116017C Production of sodium hydroxide |
| 04/22/1999 | WO1999019668A1 Method and arrangement for optimizing oxidation during burning of gaseous and liquid fuels |
| 04/22/1999 | WO1999019561A1 A method for black liquor gasification in recovery boilers |
| 04/22/1999 | CA2306174A1 A method for black liquor gasification in recovery boilers |
| 04/22/1999 | CA2305372A1 Method and arrangement for optimizing oxidation during burning of gaseous and liquid fuels |
| 04/20/1999 | US5894806 Process for increasing the effectiveness of slag and/or corrosion control chemicals for combustion units |
| 04/14/1999 | EP0908554A1 Process for recovering alkali and energy from black liquor containing silicate |
| 04/14/1999 | EP0873490A4 Process for increasing the effectiveness of slag control chemicals for black liquor recovery and other combustion units |
| 04/14/1999 | CN1042964C Straw pulp black liquor silicon removing method |
| 04/08/1999 | WO1999016539A1 Reactor mixing assembly |
| 04/07/1999 | CN1213057A Methods of improving productivity of black liquor recovery boilers |
| 03/31/1999 | EP0905308A1 Methods of improving productivity of black liquor recovery boilers |