| Patents for D21C 11 - Regeneration of pulp liquors (4,054) |
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| 09/06/2001 | CA2326144A1 Strong sulfite kraft pulping |
| 09/05/2001 | EP1129254A4 Method of papermaking having zero liquid discharge |
| 09/05/2001 | EP1129254A1 Method of papermaking having zero liquid discharge |
| 09/04/2001 | US6284095 Minimization of malodorous gas release from a cellulose pulp mill feed system |
| 09/04/2001 | CA2157563C Cleaning condensates from multi-effect evaporator of cellulose pulp waste liquors |
| 08/28/2001 | US6280568 For producing kraft pulp of increased strength and bleachability |
| 08/28/2001 | US6280567 Pre-impregnating cellulose-containing material in process vessel with sulphur-containing alkaline liquor; feeding to sloping steaming vessel; separating liquor; steaming; passing liquor through heat exchanger; dividing; flashing; condensing |
| 08/28/2001 | US6279495 Method and apparatus for optimizing the combustion air system in a recovery boiler |
| 08/23/2001 | WO2001061248A1 Arrangement for cleaning, airflow control and pushing away melt in air ports of incineration boilers |
| 08/22/2001 | EP1126075A2 Dissolved solids control in pulp production |
| 08/22/2001 | CN1309207A Process for reclaiming neutral ammonium sulfite liquor to produce more lignin products |
| 08/21/2001 | CA2172701C Processes of retaining chelant-containing effluent within pulp bleach plants |
| 08/16/2001 | WO2001059204A1 Process for oxygen pulping of lignocellulosic material and recovery of pulping chemicals |
| 08/14/2001 | CA2156617C A method of separating sulphur compounds |
| 08/08/2001 | CN2441845Y Double roller replacable wash engine |
| 08/08/2001 | CN1307657A Increasing causticizing efficiency of alkaling pulping liquor by borate addition |
| 07/31/2001 | CA2180243C Recovery boiler for combustion of waste liquors |
| 07/26/2001 | WO2001053602A1 Bleaching pulp |
| 07/26/2001 | WO2001053203A1 Method for producing calcium carbonate |
| 07/25/2001 | EP0835341B1 Method for producing polysulfides by electrolytic oxidation |
| 07/25/2001 | CN1305030A Process for degradating chlorinated lignin and its derivatives |
| 07/24/2001 | US6264819 Method for producing polysulfide by electrolytic oxidation |
| 07/19/2001 | US20010008177 Minimization of malodorous gas release from a cellulose pulp mill feed system |
| 07/18/2001 | EP1116776A2 Method for treating spent caustic streams |
| 07/18/2001 | EP0791101B1 Odour treatment of malodorous condensates with ozone-containing residual gas |
| 07/18/2001 | CN1304470A Partial autocausticization of alkali liquors for wood pulping processes |
| 07/17/2001 | US6261412 Flash stations produce heated vapor in lower temperature clean condensate, heated vapor is used to heat the foul condensate to steam stripping temperature; energy integrated into existing process areas; cellulose and kraft pulp mills |
| 07/17/2001 | US6261411 From spent black liquor comprising organic material having oxygen groups, heating lime to convert oxygen to carbon dioxide; processing liquors as slurry rather than homogeneous solution reducing the amount of organic mass |
| 07/12/2001 | WO2001049928A1 Method for improved turpentine recovery from modern cooking plants |
| 07/11/2001 | CN2438745Y Double-roller pulp extruding machine |
| 07/11/2001 | CN1302932A Process for recovering caustic soda from black liquid by electrolysis |
| 07/11/2001 | CN1302931A Process for treating papermaking pulping sewage and its treating and recovering system |
| 07/10/2001 | US6258206 Process for purifying condensate while evaporating waste liquors |
| 07/10/2001 | CA2185904C Recovering chemical values from black liquor |
| 07/05/2001 | DE19962411A1 Recovering carboxylic acids from waste solutions in pulp production by adding an extraction agent to the waste solution |
| 07/03/2001 | CA2184284C Clarifying and/or filtering of green liquor and an apparatus therefor |
| 06/28/2001 | WO2001046520A1 Method for obtaining/recuperating by extraction carboxylic acids from waste liquors derived from pulp production |
| 06/27/2001 | EP1109750A1 Process for the inhibition of scale in harsh systems and novel antiscalants for same |
| 06/27/2001 | EP0970020B1 Process for treating wastewater |
| 06/26/2001 | US6252109 Quickly releasing bound formic acid from washed material, i,e. cellulose or lignin formates from a pulp cooker, at a normal pressure and at a temperature less than 1oo degrees c. using a low concentration of free formic acid as catalyst |
| 06/20/2001 | EP1108084A1 Screening of fibrous suspensions |
| 06/13/2001 | CN2434327Y Black liquor extracting machine |
| 06/13/2001 | CN1298985A Alkali recovery process for black paper-making liquid of grass pulp |
| 06/12/2001 | CA2160008C Process for converting sodium sulphate |
| 06/06/2001 | CN1298370A Stable oxidizing bromine formulations, method of manufacture thereof and methods of use for microbiofouling control |
| 06/06/2001 | CN1066634C Method and apparatus for absorbing hydrogen sulphide |
| 06/05/2001 | CA2180622C Leaching process |
| 06/05/2001 | CA2173191C Electrochemical process |
| 05/31/2001 | WO2001037984A1 Ceramic insulation in reactor for gasification of residual products obtained from pulp production |
| 05/31/2001 | US20010001977 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 |
| 05/29/2001 | US6239198 Precipitated by acidification; allows separation of these polymers in solid form and drying in air at normal pressure and using temperatures between 40 and 110 degrees c. without becoming black. |
| 05/29/2001 | US6238468 Quench vessel |
| 05/29/2001 | US6238459 Ultra-high particulate collection of sub-micron aerosols |
| 05/23/2001 | CN1296100A Method for bleaching waste water of paper making |
| 05/22/2001 | US6235152 Process for treating an aqueous liquid containing forming calcium scale salts by adding a copolymer of 1,2-dihdroxy-3-butene antiscalant |
| 05/22/2001 | US6235151 Inhibiting scaling in alkaline waste liquor evaporators |
| 05/17/2001 | WO2001034288A1 Apparatus to recover sulfur from concentrated acid gas into alkaline solution |
| 05/16/2001 | EP1099021A1 Method an arrangement for cleaning contaminated condensate including a combined stripper/condenser |
| 05/16/2001 | EP1099020A1 A process for concentrating soluble and colloidal substances in process waters |
| 05/16/2001 | CN1295636A Treatment of filtrates from peroxide bleaching of pulp |
| 05/15/2001 | US6232419 Process for the inhibition of scale in harsh systems and novel antiscalants for same |
| 05/09/2001 | EP1098031A1 Procedure for arranging water circulations in an integrated paper mill |
| 05/09/2001 | EP1097908A1 Circuit purification for the papermaking industry |
| 05/09/2001 | CN1294221A Thermo-degradable cracking process for treating black liquid of chemical pulping |
| 05/09/2001 | CN1294220A Process for treating waste paper pulp liquid without environmental pollution and its equipment and usage |
| 05/08/2001 | US6228214 Air pollution control |
| 05/03/2001 | WO2001031119A1 Method and apparatus for optimizing the addition of combustion air in a recovery boiler |
| 05/03/2001 | DE19957696C1 Apparatus for gasifying carbon-containing fuels, residual materials and waste comprises a fly stream reactor with cooling channels formed by bars which are in contact with a refractory protective layer and a pressure shell |
| 05/02/2001 | EP1094987A1 Stable oxidizing bromine formulations, methods of manufacture thereof and methods of use for microbiofouling control |
| 05/01/2001 | CA2157394C Process and installation for preparing cellulose waste lye |
| 04/26/2001 | DE19950941A1 Acrylic acid polymers, useful as inhibitors of calcium sulfate deposition in paper pulp and recycled paper treatment, comprises polymer containing acrylic acid monomer |
| 04/25/2001 | CN1065013C Oxidized white liquor production method |
| 04/24/2001 | CA2103066C White liquor preparation and pulping process |
| 04/19/2001 | WO2001027384A1 Method and arrangement for recovering chemicals from fly ash in a gasification process |
| 04/18/2001 | EP1092059A1 Partial autocausticization of alkali liquors for wood pulping processes |
| 04/18/2001 | CN1292053A Method for treating process water |
| 04/17/2001 | US6217711 Method of treating condensates |
| 04/17/2001 | CA2170096C A process for treating liquids |
| 04/17/2001 | CA2146561C Method and apparatus for recovering heat in a spent liquor recovery boiler |
| 04/12/2001 | WO2001025531A1 Process for preventing scaling of heat transfer surfaces |
| 04/11/2001 | EP1090181A1 Increasing causticizing efficiency of alkaline pulping liquor by borate addition |
| 04/10/2001 | CA2196503C Method and apparatus for treating pulping process waste liquors |
| 04/04/2001 | EP0850415B1 Determination of sodium sulfide and sulfidity in green liquors and smelt solutions |
| 04/03/2001 | US6210455 Evaporation apparatus for evaporation of liquids |
| 03/22/2001 | WO2001020075A1 Oxidised white liquor in an oxygen delignification process |
| 03/21/2001 | EP1084292A1 Treatment of filtrates from peroxide bleaching of pulp |
| 03/15/2001 | WO2001018278A1 Method for producing a polysulfide |
| 03/15/2001 | DE19856582C1 Verfahren zur Gewinnung von Chemiezellstoff aus Hackschnitzeln A process for the production of chemical pulp from wood chips |
| 03/14/2001 | EP0787232B1 Process for the final evaporation of black liquor |
| 03/06/2001 | US6198005 Treating methanol containing waste gas streams |
| 02/28/2001 | CN1285436A Method and equipment for treating black liquor into boil solution |
| 02/28/2001 | CN1285435A Sewage comprehensive treatment method for alkaline method straw pulp paper-making |
| 02/20/2001 | US6190633 Process for preparing calcium carbonate |
| 02/20/2001 | US6190503 Insoluble, only slightly swellable polymers which contain polymerized vinylamine units, and these polymers are used as adsorbents for treating water circulations in papermaking and for treating paper machine wastewaters |
| 02/20/2001 | CA2150254C Method of bleaching pulp without using chlorine-containing chemicals |
| 02/14/2001 | CN2419242Y Black liquid treating apparatus for alkali wheat stalks papermaking |
| 02/13/2001 | US6186080 Recovery boiler |
| 02/08/2001 | WO2000061860A3 A method for reducing the risk for coatings and cloggings of heat absorbing surfaces present above the black liquor sprayers in a recovery boiler |
| 02/07/2001 | CN1282818A Combined equipment for separating black liquid from paper pulp and its technology |
| 02/07/2001 | CN1282817A Process and equipment for cyclically treating paper-making sawage by chemical and physical synchronization method |