| Patents for D21C 11 - Regeneration of pulp liquors (4,054) |
|---|
| 05/21/2002 | CA2224765C Method of producing oxidized white liquor from black liquor |
| 05/14/2002 | US6387348 Method for treating spent caustic streams |
| 05/10/2002 | WO2002036876A1 A cooking process using hot black liquor |
| 05/10/2002 | CA2425381A1 A cooking process using hot black liquor |
| 05/09/2002 | US20020053640 Determination of ionic species concentration by near infrared spectroscopy |
| 05/09/2002 | US20020053520 Method for producing polysulfides by means of electronlytic oxidation |
| 05/08/2002 | CN2490534Y Soda recovery causticization green liquor heating apparatus |
| 05/08/2002 | CN1084413C Process for causticizing green solution of alkali recovred from black liquid of paper-making |
| 05/07/2002 | US6383342 Handling fluid streams in cellulose pulp mill; stripping; reboilers |
| 05/02/2002 | EP1201285A1 Method for fractionating sulphite cooking liquor |
| 05/01/2002 | CN1083917C Combined equipment for separating black liquor from paper pulp and its process |
| 04/25/2002 | US20020046819 Kraft waste reclamation methodology |
| 04/24/2002 | EP1198636A1 Use of alkyleneamines for enhancing lime mud dewatering |
| 04/24/2002 | EP0848635B1 Liquid distributor for evaporator |
| 04/24/2002 | CN1345997A Treating method for converting waste liquid produced in paper-making process into usable resource. |
| 04/23/2002 | US6375795 Minimization of malodorous gas release from a cellulose pulp mill feed system |
| 04/23/2002 | CA2230266C Determination of sodium sulfide and sulfidity in green liquors and smelt solutions |
| 04/18/2002 | WO2000065150A9 Gasification process for spent liquor at high temperature and high pressure |
| 04/18/2002 | US20020043221 Arrangement for feeding black liquor into a recovery boiler |
| 04/18/2002 | US20020043192 Methods of improving productivity of black liquor recovery boilers |
| 04/17/2002 | EP1196641A1 Preparation of chemical pulp and xylose, utilizing a direct acid hydrolysis on the pulp |
| 04/16/2002 | US6372139 Anaerobic treatment, aeration and flotation, sand filtration or urea-formaldehyde membrane solids separation; effluents reutilization |
| 04/16/2002 | CA2236233C Removal of caustic in hemicellulose caustic |
| 04/16/2002 | CA2212955C Black liquor viscosity control |
| 04/16/2002 | CA2079238C Membrane separation process |
| 04/10/2002 | EP1194376A1 Method for causticisation of alkaline solutions |
| 04/10/2002 | CN1082587C Method for producing polysulfides by electrolytic oxidation |
| 04/09/2002 | CA2225927C Recovery process in a pulp mill |
| 04/09/2002 | CA2069107C Process for the preparation of cooking liquors having high sulphidity for sulphate pulp cooking |
| 04/03/2002 | EP1193341A1 Method and apparatus for preparing green liquor |
| 04/02/2002 | US6365035 Method for measuring properties of the stack and the corrosion of materials in a soda recovery unit |
| 03/28/2002 | US20020036069 Flash tank steam economy improvement |
| 03/27/2002 | EP1190137A1 Method for separating lignocellulose-containing biomass |
| 03/27/2002 | CN1081704C Process for dissolving alkali by flushing with hot liquid on inclined plate |
| 03/20/2002 | CN1341077A Method for producing polysulfide by use of electrolytic oxidation |
| 03/13/2002 | CN1340121A Process for oxygen pulping of lignocellulosic material and recovery of pulping chemicals |
| 03/13/2002 | CN1339629A Fast treating process for waste water of straw pulp paper industry |
| 02/21/2002 | US20020021994 Forming fuel gas for combustion process |
| 02/20/2002 | CN1336459A Atomizing combustion method of papermaking black liquor in industrial boiler |
| 02/20/2002 | CN1336458A Making process of acid polishing effluent product |
| 02/19/2002 | US6348129 Aqueous streams containing total reduced sulfur compounds; treating said first gaseous product stream with an alkaline aqueous stream; scrubbing of the off-gas from the ozone treatment with an aqueous alkaline stream |
| 02/19/2002 | US6348128 Method of increasing the causticizing efficiency of alkaline pulping liquor by borate addition |
| 02/13/2002 | CN1335905A Method of reducing the silicon content of green liquor |
| 02/13/2002 | CN1335428A Paper-making effluent treating process |
| 02/12/2002 | US6346167 Kraft cooking communited cellulose fibers at high rate by controlling effective dissolved lignin concentration of the cooking liquor; kraft pulp of increased strength, bleachability that uses less effective alkali |
| 02/12/2002 | US6346166 Recovering energy from hot spent cooking liquor in pulp mill using jet ejector |
| 02/06/2002 | EP1178009A1 Method for producing polysulfide by use of electrolytic oxidation |
| 02/06/2002 | EP1177344A1 Feeding device and process and feeding system which utilise the feeding device |
| 02/06/2002 | EP0859884B1 Process for purifying condensate while evaporating waste liquors |
| 02/06/2002 | CN1334376A Alkali recovery process for black liquor of straw pulp |
| 01/29/2002 | CA2202250C Black liquor impregnation in single-vessel hydraulic digester |
| 01/16/2002 | EP0897432B1 Method and plant for separating soap from black liquor |
| 01/16/2002 | EP0792394B1 Black liquor impregnation in single-vessel hydraulic digester |
| 01/16/2002 | CN2471815Y Papermaking blank liquid evaporator |
| 01/15/2002 | US6339222 Quantitative analysis of hydrogen ion and anions in pulp milling process |
| 01/09/2002 | CN1330740A Arundo donax pulp, paper products and particle board |
| 01/09/2002 | CN1330057A Process for preparing multi-element organic furtilizer from extract of black paper-making liquid |
| 01/09/2002 | CN1077552C Method and equipment for quickly treating waste water for paper mill |
| 01/08/2002 | US6336994 Cooking cellulosic material, recovering filtrate, washing with acids, delignifying in presence of oxygen, bleaching with chlorine-free bleachear, recovering filtrate, regenerating bleacher |
| 01/08/2002 | CA2231278C Protection of the air ports of a recovery boiler |
| 01/08/2002 | CA2117064C Method for the combustion of waste liquids |
| 01/02/2002 | EP0873490B1 Process for increasing the effectiveness of slag control chemicals for black liquor recovery and other combustion units |
| 01/01/2002 | CA2095015C Process and device in a chemicals recovery plant in a sulphate pulp mill |
| 12/12/2001 | EP1161592A1 Process for oxygen pulping of lignocellulosic material and recovery of pulping chemicals |
| 12/05/2001 | EP1109750A4 Process for the inhibition of scale in harsh systems and novel antiscalants for same |
| 12/04/2001 | CA2043605C Process for the partial combustion of cellulose spent liquors |
| 11/28/2001 | CN1075574C Process for preparing sodium xylose from paper-making black liquor and recovering caustic soda by dry combustion |
| 11/27/2001 | US6322768 Contacting gas vented from a cellulose pulp bleaching process with an alkaline metal base and peroxide forming an chlorite and oxidizing with an acid; efficiency |
| 11/22/2001 | WO2001088258A1 Thermal conversion of biomass to valuable fuels, chemical feedstocks and chemicals |
| 11/21/2001 | EP1155184A1 Method of producing process steam from a black liquor |
| 11/20/2001 | US6319358 Electrolytic causticizing of smelt from a kraft recovery furnace |
| 11/06/2001 | US6312560 E.g., ethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, ethylenimine oligomers having an average molecular weight of about 200-500; added prior to filtration |
| 11/06/2001 | US6311630 Method and device for removal of soda melt from a soda recovery unit |
| 11/01/2001 | US20010035271 Process for the inhibition of scale |
| 10/31/2001 | EP1149946A1 Treatment of pulp mill condensate with ozone |
| 10/30/2001 | CA2184706C Impact of temperature and alkali charge on pulp brightness |
| 10/28/2001 | CA2345446A1 Treatment of pulp mill condensate with ozone |
| 10/24/2001 | EP1092059A4 Partial autocausticization of alkali liquors for wood pulping processes |
| 10/24/2001 | EP1090181A4 Increasing causticizing efficiency of alkaline pulping liquor by borate addition |
| 10/23/2001 | US6306357 Process and apparatus for absorbing hydrogen sulphide |
| 10/23/2001 | US6306252 Passing hot black liquor including sulphur compounds from digester through heat exchanger; passing evaporable liquid to be evaporated through heat exchanger into heat exchange contact with hot black liquor to produce steam |
| 10/18/2001 | US20010030029 Calcium carbonate; air pollution control |
| 10/17/2001 | EP1144757A1 A method of cleaning sulfide contaminated condensates |
| 10/17/2001 | CN1317610A Alkaline pulping process of wheel straw without drainage of black liquid |
| 10/16/2001 | CA2173369C A recovery boiler where the flue gas is divided into two streams and a method therefore |
| 10/10/2001 | CN1316567A Process for treating black digestion liquid generated by paper alkali pulping |
| 10/04/2001 | WO2001073195A1 Treatment of bleach plant filtrates |
| 10/04/2001 | DE10114213A1 Verfahren und Vorrichtung zur Verbrennung von Schwarzlauge Method and apparatus for combustion of black liquor |
| 10/02/2001 | US6297353 Recovering neutral particles from solution; neutralize preferential pitch, dehydrate neutralized solution current, feed dehydrated current to chromatagraphy column, distill current, recover distillate current, recover residue current |
| 09/27/2001 | US20010023750 Vapor generated during concentration used to preheat combustion air; evaporation |
| 09/26/2001 | CN1314513A After-processing method for chemical-mechanical pulping system by using grass fibre as raw material |
| 09/25/2001 | US6294048 Partially autocausticizing a sodium carbonate-containing smelt by reaction with borate; dissolving borate-containing partially autocausticized smelt in aqueous solution; introducing lime to regenerate sodium hydroxide |
| 09/19/2001 | CN1313837A Process for the inhibition of scale in harsh system and novel antiscalants for same |
| 09/19/2001 | CN1313426A Process for treatinb black liquid of cotton pulse by means of water-coal slurry |
| 09/18/2001 | US6290812 Adjusting magnecium content of process water;supplying carbonate source to process water to precipiate calcium as calcium carbonate; adding white liquor to precipitate metals; adding flocculating agent; separation by floation |
| 09/13/2001 | US20010020346 Gasification reactor vessel |
| 09/12/2001 | EP0953080B1 A method for black liquor gasification in recovery boilers |
| 09/12/2001 | CN1070962C Sewagefree discharging treatment method for paper-making black-liquid |
| 09/11/2001 | US6287415 Arrangement in soda recovery boiler for removing melts for maintenance |
| 09/07/2001 | WO2001065003A1 Process for recovering organic acids from bleaching liquors |