| Patents for D21C 9 - After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters (10,265) |
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| 02/04/1998 | EP0821616A1 Device for admixing a first fluid into a second fluid |
| 02/04/1998 | CN1172514A Method of treating fibrous material with chemical reagent and apparatus for carrying out the said method |
| 02/03/1998 | CA2063591C Environmentally improved process for bleaching lignocellulosic materials |
| 01/29/1998 | WO1998003626A2 Metal ligand containing bleaching compositions |
| 01/29/1998 | WO1998003625A1 Metal ligand containing bleaching compositions |
| 01/29/1998 | DE19630278A1 Komplexbildner für die Zellstoff- und Holzstoffbleiche, die Papierherstellung sowie das Deinking von Altpapier Complexing agents for the pulp and pulp bleaching, paper-making, as well as the inking of waste |
| 01/28/1998 | EP0821099A1 Use of hydrophilic dispersion polymers for coated broke treatment |
| 01/28/1998 | EP0820544A1 Treatments for inhibiting deposition in papermaking systems |
| 01/28/1998 | EP0786030A4 Washing pulp using an endless support fabric |
| 01/28/1998 | CN1171827A Bleaching of filled paper |
| 01/27/1998 | US5711945 Spraying pulp of southern pine and aspen with inoculum of bacteria, reducing discoloration caused by fungi |
| 01/27/1998 | US5711852 Method and device for mixing of a fluid into a pulp-suspension |
| 01/21/1998 | EP0672209B1 Method and apparatus for bleaching pulp |
| 01/21/1998 | EP0672208B1 Method of bleaching pulp without using chlorine-containing chemicals |
| 01/21/1998 | EP0644965B1 Bleaching recycled pulp with ozone and hydrogen peroxide |
| 01/20/1998 | US5709774 Heat treated high lignin content cellulosic fibers |
| 01/15/1998 | WO1998001620A1 Method for refining cellulose stock |
| 01/15/1998 | WO1998001617A1 Methods for inhibiting organic contaminant deposition in pulp and papermaking systems |
| 01/15/1998 | WO1998001616A2 Stock washer for washing, thickening and classifying solids |
| 01/15/1998 | DE19729155A1 Bleaching pulp containing lignocellulose, giving low organic chlorine content without reducing strength |
| 01/15/1998 | CA2255833A1 Stock washer for washing, thickening and classifying solids |
| 01/15/1998 | CA2249372A1 Methods for inhibiting organic contaminant deposition in pulp and papermaking systems |
| 01/13/1998 | US5707489 Pulping wast paper, slurrying, thickening, filtration then cleaning to remove impurities |
| 01/08/1998 | WO1998000602A1 Pressurized chlorine dioxide bleaching with recovery of chlorine dioxide |
| 01/08/1998 | WO1998000601A2 Device for transferring and processing a humid fibrous mass |
| 01/08/1998 | CA2189724A1 Method of pulping |
| 01/07/1998 | EP0816558A1 Process for increasing the degree of whiteness of paper making stock |
| 01/07/1998 | EP0791098A4 Apparatus for fluffing pulp |
| 01/07/1998 | EP0770157A4 Improved bleaching of high consistency lignocellulosic pulp |
| 01/07/1998 | EP0750698A4 Apparatus for fluffing high consistency wood pulp |
| 01/07/1998 | EP0746650A4 Pulping of fibrous plant materials and recovery of resultant by-products |
| 01/07/1998 | EP0743876B1 Apparatus for mixing a first fluid into a second fluid |
| 01/07/1998 | EP0689625B1 Pitch degradation with white rot fungi |
| 01/07/1998 | EP0683832B1 Process for crosslinking of cellulosic fibers |
| 01/07/1998 | EP0651832B1 Process for gas phase delignifying wood pulp |
| 01/07/1998 | CN2272028Y Double-screen filter-press vacuum pulp cleaner |
| 01/07/1998 | CN2272027Y Double-screen filter press |
| 01/07/1998 | CN2272026Y Double-screen filter-press multi-roller furnisher |
| 01/07/1998 | CN1169760A Apparatus for fluffing pulp |
| 01/06/1998 | US5705383 Inoculating log with schizophyllum, trichaptum and/or phanerochaete fungi; conserves electricity |
| 12/31/1997 | WO1997049861A1 Distributing device for paper pulp |
| 12/31/1997 | WO1997049860A1 Device for distributing suspensions, especially cellulose suspensions, in a container |
| 12/31/1997 | WO1997049859A1 Improved pulp washing method |
| 12/31/1997 | WO1997049482A1 Mixing device |
| 12/31/1997 | CN1169170A Method for pressurized peroxide bleaching |
| 12/31/1997 | CA2258962A1 Improved pulp washing method |
| 12/29/1997 | EP0814193A2 Stabilizing agent for peroxide-bleaching procedure and methods of bleaching a fiber material by using same |
| 12/29/1997 | EP0813629A1 Process for producing short-fibered softwood pulps |
| 12/29/1997 | CA2208940A1 Process for increasing the brightness of paper stock |
| 12/24/1997 | CN2271180Y Low vacuum cylinder thickener |
| 12/24/1997 | CN1168706A Method for removal of hexenuronic acid groups in cellulose pulp by heat treatment |
| 12/23/1997 | US5700350 Processes of retaining chelant-containing effluent within pulp bleach plants |
| 12/23/1997 | US5699573 Method and pulp washing machine for washing of pulp or any corresponding material |
| 12/23/1997 | CA2050158C Process and apparatus for the discharge of a medium |
| 12/21/1997 | CA2207884A1 Stabilizing agent for peroxide-bleaching procedure and methods of bleaching a fiber material by using same |
| 12/17/1997 | EP0812299A1 Plant for producing hydrogen peroxide |
| 12/17/1997 | EP0812298A1 Apparatus for feeding hydrogen peroxide to a processing unit in an industrial facility |
| 12/17/1997 | EP0812297A1 PLANT FOR PRODUCING HYDROGEN PEROXIDE $i(IN SITU) IN A PAPER MILL |
| 12/17/1997 | CN2270750Y Black liquor treatment device for paper making |
| 12/17/1997 | CN1167855A Process for delignification and bleaching of chemical paper pulps |
| 12/16/1997 | US5698688 Esterification; oxidation; wet strength |
| 12/16/1997 | US5698265 Calcium phosphate compound-cellulose fiber composite material and method for production thereof |
| 12/16/1997 | US5698079 Arrangement for spreading paper pulp in a container |
| 12/16/1997 | US5698075 Process for bleaching a chemical paper pulp in an oxygen-peroxymonosulfuric acid-hydrogen peroxide sequence |
| 12/16/1997 | CA2009926C Producing constant distribution of selected property across width of pulp mat on pulp washing surface |
| 12/11/1997 | WO1997046309A1 Method and apparatus for mixing a second medium with a first medium |
| 12/10/1997 | EP0811089A1 System and method for recycling materials |
| 12/10/1997 | EP0689626A4 Wood pulp processing apparatus and method |
| 12/10/1997 | EP0682696B1 Oxidising agents |
| 12/10/1997 | EP0627030A4 Modified digestion of paper pulp followed by ozone bleaching. |
| 12/10/1997 | CN1167182A Method for eliminating sewage generation in extracting cellulose |
| 12/09/1997 | US5696068 Isolated culture product hydrolase enzyme use in detergents, papermaking, pulping |
| 12/09/1997 | US5695606 Oxidative delignification of wood or wood pulp by transition metal-substituted polyoxometalates |
| 12/09/1997 | US5695605 Oxidative delignification of wood or wood pulp by transition metal-substituted polyoxometalates |
| 12/09/1997 | US5695604 Method for reprocessing an ozone-containing gas present in a pulp bleaching plant |
| 12/09/1997 | CA2041536C Method for treatment and recycling of pulp mill bleach plant effluents |
| 12/05/1997 | CA2205679A1 Minimization of transition metal ions during chemical pulping |
| 12/04/1997 | WO1997045586A1 Process for the bleaching of chemical pulp |
| 12/04/1997 | WO1997045585A1 Process for the bleaching of high yield pulp or recycled paper pulp |
| 12/04/1997 | WO1997045396A1 N-bis- or n-tris-[(1,2-dicarboxy-ethoxy)-ethyl]-amine derivatives and preparation and use of the same |
| 12/03/1997 | EP0810322A2 Process for preparing retention and dewatering agents on the basis of polyaminoethers |
| 12/03/1997 | CN1166553A Process for deflingification and/or bleaching of paper pulp |
| 12/02/1997 | US5693185 Delignification and bleaching of cellulose pulps; papermaking; using hydrogen peroxide and sulfuric acid for in situ preparation of caro's acid; kinetics |
| 12/02/1997 | US5693184 Reduction of salt scale precipitation by control of process stream pH and salt concentration |
| 12/02/1997 | US5693017 Apparatus and method of delivery of gas-supersaturated solutions to a delivery site |
| 12/02/1997 | US5692619 Apparatus for filtering suspensions |
| 11/30/1997 | CA2206393A1 Process for the preparation of retention and dewatering agents based on polyamino-ethers |
| 11/27/1997 | WO1997044520A1 A method for the delignification of fibrous material and use of a catalyst |
| 11/27/1997 | WO1997044519A1 Compositions and methods for inhibiting deposits in pulp and papermaking systems |
| 11/27/1997 | WO1997036052A3 Paper products having wet strength from aldehyde-functionalized cellulosic fibers and polymers |
| 11/27/1997 | DE19620952A1 Improving pulp whiteness in alkali de-inking process |
| 11/27/1997 | DE19620241A1 Verfahren zum Delignifizieren von Zellstoffen und Verwendung eines Katalysators A method for delignification of pulp and use of a catalyst |
| 11/27/1997 | CA2255588A1 A method for the delignification of fibrous material and use of a catalyst |
| 11/26/1997 | EP0692044A4 Method for reusing spent gas from an ozone bleaching reactor |
| 11/26/1997 | EP0561786B1 Bleaching chemical pulp using chlorine/chlorine dioxide then ozone |
| 11/25/1997 | US5691193 Using oxidative enzymes and hysrogen peroxide |
| 11/25/1997 | US5690786 Process for the treatment of pulp with oxygen and steam using ejectors |
| 11/19/1997 | EP0807210A1 A continuous dynamic mixing system and methods for operating such system |
| 11/19/1997 | EP0715645B1 Use of phenolic complexing agents |
| 11/19/1997 | EP0704004A4 Method for multistage bleaching of wood pulp |