| Patents for D21C 11 - Regeneration of pulp liquors (4,054) |
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| 02/07/2001 | CN1061727C Agent for recovering waste water and residuals for papermaking of corrugated paper |
| 02/06/2001 | US6183598 Process for recovering alkali and black liquor containing silicatae |
| 02/01/2001 | WO2001007712A1 Use of alkyleneamines for enhancing lime mud dewatering |
| 02/01/2001 | CA2378766A1 Use of alkyleneamines for enhancing lime mud dewatering |
| 01/31/2001 | EP1071842A1 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 |
| 01/30/2001 | US6178924 Method for upgrading a boiler |
| 01/30/2001 | US6178898 Recovery boiler |
| 01/24/2001 | EP0783359B1 Liquid distributor for an evaporator |
| 01/24/2001 | CN1061116C Process for treatment of gaseous discharges resulting from kraft process using derivatives of undecylenic and/or undecynoic acid |
| 01/23/2001 | US6176971 Passing hot spent chemical cellulose pulping treatment liquor to a reboiler, then pressurization of the resulting steam for subsequently steaming chips to be pulped |
| 01/23/2001 | CA2207937C Separation of sulphides and chlorides from pulping liquors by electrodialysis |
| 01/18/2001 | WO2001004362A1 Preparation of chemical pulp and xylose, utilizing a direct acid hydrolysis on the pulp |
| 01/17/2001 | EP0811090B1 Black liquor viscosity control |
| 01/10/2001 | CN1279316A Process for extracting lignin from black liquid of making paper with alkali straw pulp |
| 01/02/2001 | US6168685 Process FOR oxidation of concentrated black liquor |
| 12/28/2000 | WO2000079040A1 Process and device for oxygen delignification giving improved kappa reduction |
| 12/26/2000 | US6165316 Separating fibers in soap and fiber containing liquid from the liquid in pressure screen to produce soap-containing liquid having reduced fiber content to facilitate and intensify further treatment of soap-containing liquid |
| 12/20/2000 | EP1060306A1 Method for treating process water |
| 12/19/2000 | US6162408 Process for purifying ash which principally consists of sodium sulphate from a recovery boiler |
| 12/14/2000 | WO2000075421A1 Device for gasification of spent liquor |
| 12/14/2000 | CA2311443A1 Flash tank steam economy improvement |
| 12/13/2000 | EP1058713A1 Lignin based colloidal compositions |
| 12/13/2000 | CN1276452A Process for treating paper-making black liquor to obtain regenerated resource |
| 12/13/2000 | CN1276351A Coagulant aids and preparing process thereof |
| 12/13/2000 | CN1059482C Method for treating soda black liquor |
| 12/12/2000 | US6159337 Dissolved organic materials control in cellulose pulp production |
| 12/07/2000 | WO2000073578A1 Method for recovering chemicals in a process of producing pulp by kraft process |
| 12/07/2000 | WO2000073577A1 Method and apparatus for controlling a causticizing process |
| 12/05/2000 | US6155210 Process for obtaining flue gases with low content of NOx while combusting black liquor and a recovery boiler therefor |
| 11/22/2000 | CN2406711Y System for reusing flash vapor |
| 11/21/2000 | US6149765 Steam reforming, heating, injecting steam and depositing toxic wastes |
| 11/16/2000 | WO2000068496A1 Feeding device and process and feeding system which utilise the feeding device |
| 11/15/2000 | EP1052326A1 Use of oxidized white liquor in a kraft mill digester |
| 11/15/2000 | EP0803008B1 Method of precipitating transition metals and alkaline earth metals from bleach plant effluents |
| 11/15/2000 | CN1058539C Non-pollution treatment and comprehensive utilization of paper pulp digesting black liquor using alkaline process and sulphate process |
| 11/14/2000 | US6146495 Kraft process for the production of wood pulp by adding a copolymer of 1,2-dihydroxy-3-butene antiscalant |
| 11/11/2000 | CA2307486A1 Use of oxidized white liquor in a kraft mill digester |
| 11/09/2000 | DE19916347C1 Verfahren zum Auftrennen lignocellulosehaltiger Biomasse A method for separating lignocellulosic biomass |
| 11/07/2000 | US6143130 Impregnation, chemical digestion of lignocellulose; recovery of pulping liquors by withdrawing a spent polysulfide; converting to sulfur in an oxidation reactor; mixing the sulfur with sulfides to disulfide and recycling |
| 11/02/2000 | WO2000065150A1 Gasification process for spent liquor at high temperature and high pressure |
| 11/02/2000 | WO2000065149A1 Sulfur recovery from spent liquor gasification process |
| 11/02/2000 | WO2000064812A1 Method for causticisation of alkaline solutions |
| 11/02/2000 | WO2000064589A1 Ultra-high particulate collection of sub-micron aerosols |
| 11/02/2000 | CA2370964A1 Sulfur recovery from spent liquor gasification process |
| 11/01/2000 | CN1272094A Method for producing polysulfide by electrolytic oxidation |
| 10/24/2000 | US6136144 Converting lime mud in the calcinator into quick lime by heating packed bed, preheating the packed bed, feeding process gas to packed bed, oxidizing volatile organics, form gaseous product with sulfur di and trioxide, finally sulfur |
| 10/19/2000 | WO2000061860A2 A method for reducing the risk for coatings and cloggings of heat absorbing surfaces present above the black liquor sprayers in a recovery boiler |
| 10/19/2000 | WO2000061859A1 Process for the treatment of fly ash, using hydrochloric acid |
| 10/19/2000 | WO2000061858A1 Method for separating lignocellulose-containing biomass |
| 10/18/2000 | CN1057512C Harnessing method for papermking waste water |
| 10/17/2000 | US6132556 Varying the flow rate of liquor extracted from the pressure-control extraction to maintain the pressure in the digester at a desired superatmospheric level while maintaining a uniform and stable material movement in the counter-current |
| 10/17/2000 | US6132555 Method and arrangement for increasing evaporation capacity of a multi-stage evaporator of spent liquor in a pulp mill |
| 10/17/2000 | CA2098288C Distillation apparatus |
| 10/12/2000 | WO2000060163A1 Apparatus for gasification of spent liquor |
| 10/12/2000 | WO2000060162A1 Apparatus for gasification of spent liquor |
| 10/12/2000 | WO2000060161A1 Process for cooling solid and gaseous material during gasification of spent liquor |
| 10/12/2000 | WO2000060160A1 Process for producing cellulose pulp and fertiliser containing potassium |
| 10/12/2000 | WO2000043589B1 Treatment of recirculated filtrates in pulp production |
| 10/11/2000 | CN1057360C Alkali recovery process from waste liquid of grass pulp paper-making by multi-point drying and burning |
| 09/27/2000 | EP1039020A1 Process for bleaching lignocellulosic pulp |
| 09/27/2000 | CN1268199A Process for treating spent,waste, alkaline digestion liquid from paper pulping operations and product |
| 09/26/2000 | US6123806 Process for kraft chemical recovery |
| 09/20/2000 | CN2397173Y Combined pulp black-liquor separation equipment |
| 09/20/2000 | CN1267344A Method for recovery of formic acid |
| 09/14/2000 | WO2000029666A8 Recovery boiler salt-cake injection method and apparatus |
| 09/12/2000 | CA2175935C Treatment of waste paper |
| 09/08/2000 | WO2000052259A1 Device for the cleaning of a liquor spray nozzle assembly of a soda recovery boiler |
| 09/08/2000 | CA2363150A1 Device for the cleaning of a liquor spray nozzle assembly of a soda recovery boiler |
| 09/06/2000 | CN2394945Y Paper pulp black liquor drier |
| 09/06/2000 | CN2394944Y Long net double roll pulp extruder |
| 09/05/2000 | US6113739 Process for washing gas formed by gasifying black liquor |
| 09/05/2000 | CA2166083C Production of polysulphide by electolysis of white liquor containing sulphide |
| 09/05/2000 | CA2128053C Oxidized white liquor production method |
| 08/31/2000 | WO2000050689A1 Method for producing cellulose |
| 08/31/2000 | WO2000050340A1 Method for producing polysulfide by use of electrolytic oxidation |
| 08/31/2000 | WO2000050339A1 Method for producing polysulfide by electrolytic oxidation |
| 08/30/2000 | EP1030944A1 Method and device for removal of soda melt from a soda recovery unit |
| 08/30/2000 | CN1264772A Equipment for treating black liquid generated by making paper with wheat straws by sodium hydroxide method |
| 08/30/2000 | CN1264771A Pulping technology without discharge of concentrated black liquid and process for reclaiming its black liquid |
| 08/30/2000 | CN1055977C Treatment and recovery process of black liquor in papermaking mill |
| 08/29/2000 | US6111232 Recovery boiler smelt spout |
| 08/29/2000 | US6110376 Use of reverse osmosis membranes to treat evaporator clean condensate |
| 08/29/2000 | US6109911 Method and arrangement for optimizing oxidation during burning of gaseous and liquid fuels |
| 08/24/2000 | DE10008005A1 Gas-liquid contacting by micro-bubble dispersion, suitable for anti-microbiological treatment of recycled paper-making water with ozone |
| 08/23/2000 | EP1030105A2 Method and apparatus for recovery of energy from exhaust steam |
| 08/23/2000 | CN1263966A Solidifying process for treating black paper-making liquid |
| 08/22/2000 | US6106667 Treatment of recycled bleach plant filtrates |
| 08/17/2000 | WO2000047812A1 Process for oxygen pulping of lignocellulosic material and recovery of pulping chemicals |
| 08/16/2000 | EP1027141A1 Reactor mixing assembly |
| 08/15/2000 | CA2298426A1 Process and system for energy recovery from waste steam |
| 08/09/2000 | CN1262359A Cyclic process for treating black paper-making liquid of alkali pulping to recover useful resource |
| 08/04/2000 | CA2297222A1 Minimization of malodorous gas release for a cellulose pulp mill feed system |
| 08/03/2000 | WO2000044979A1 Process for the treatment of white liquor |
| 08/03/2000 | WO2000044978A1 Process for oxidising white liquor |
| 08/01/2000 | CA2142616C Reduction of chloride in pulping chemical recovery systems |
| 08/01/2000 | CA2135726C Process for purification and recycle of solutions |
| 07/27/2000 | WO2000043589A1 Treatment of recirculated filtrates in pulp production |
| 07/27/2000 | CA2360638A1 Treatment of recirculated filtrates in pulp production |
| 07/26/2000 | EP1021681A1 Method and arrangement for optimizing oxidation during burning of gaseous and liquid fuels |
| 07/26/2000 | CN1054900C Method for modifying and dewatering alkali paper-making black liquor |