| Patents for D21C 3 - Pulping cellulose-containing materials (5,020) |
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| 02/28/1998 | CA2210050A1 Defoamer composition and method of using the same |
| 02/25/1998 | EP0825294A1 Multicomponent system for modifying, decomposing or bleaching lignin, lignin-containing materials or similar substances and method of using this system |
| 02/25/1998 | EP0824616A1 A process for rapid acid hydrolisis of lignocellulosic material and hydrolisis reactor |
| 02/25/1998 | CN1174202A Ethoxyl cellulose producing process from plant cotton |
| 02/19/1998 | WO1998006857A1 Plant tissue treatment composition |
| 02/18/1998 | EP0823948A1 Method of producing a pulp of cellulosic material, the pulp itself and the use thereof |
| 02/11/1998 | EP0823004A1 Impregnation of cellulose-containing material with black liquor in a single vessel digester |
| 02/11/1998 | CN1172875A Technology for making pulp by forage alkaline process and method for disposing its produced sewage and its system device |
| 02/10/1998 | US5716497 Hot impregnated wood chips are fed into the top of countercurrent steam digester which has a bottom outlet and atleast one draw off screen girdle for removing black liquor, cooking liquour is fed to the top as fine droplets |
| 02/05/1998 | WO1998004775A1 Use of complexing agents for cellulose and wood bleaching, paper production and used paper deinking |
| 02/04/1998 | EP0822288A2 Continuous digester for the implementaion of dissolved solids profiling |
| 02/04/1998 | EP0821749A1 Method for co-refining dry urban wood chips and blends of dry urban wood chips and thermoplastic resins for the production of high quality fiberboard products |
| 02/03/1998 | CA2063591C Environmentally improved process for bleaching lignocellulosic materials |
| 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 |
| 01/21/1998 | CN1170795A Batch process for preparing improved kraft pulp |
| 01/14/1998 | EP0593743B1 Production of cellulose by the soda-anthraquinone process (sap) with recovery of the boiling chemicals |
| 01/09/1998 | CA2208936A1 Scale deposit inhibitor for kraft digesters and method for controlling scale deposition in kraft digisters |
| 01/08/1998 | WO1998000216A1 Aqueous silicone defoaming agent |
| 01/07/1998 | EP0815315A2 Method and device for process control in cellulose and paper manufacture |
| 01/07/1998 | EP0746650A4 Pulping of fibrous plant materials and recovery of resultant by-products |
| 12/31/1997 | WO1997049858A1 Method of manufacturing paper pulp/cellulose |
| 12/30/1997 | CA2133574C Method of producing pulp |
| 12/23/1997 | US5700355 Chip feeding for a continuous digester |
| 12/17/1997 | CN1167853A Patash-black liquor recovery pulping method |
| 12/17/1997 | CN1036728C Cooking and process for continuous cooking of pulp |
| 12/10/1997 | EP0627030A4 Modified digestion of paper pulp followed by ozone bleaching. |
| 12/05/1997 | CA2205679A1 Minimization of transition metal ions during chemical pulping |
| 12/03/1997 | EP0810321A1 Batch process for preparing improved kraft pulp |
| 12/02/1997 | CA2005982C Process for the prevention of scale formation in wood pulp production |
| 11/26/1997 | CN1165888A Straw pulp for producing offset printing paper by sulammonium process |
| 11/19/1997 | EP0806978A1 Use of alkoxylation products of epoxidized fats as antifoaming agents |
| 11/06/1997 | WO1997041294A1 Hydrogen sulphide pretreatment of lignocellulosic material in continuous pulping processes |
| 10/28/1997 | US5681427 Apparatus for treating pulp produced by solvent pulping |
| 10/28/1997 | US5680995 Continuous digester |
| 10/23/1997 | WO1997039181A1 Method and apparatus for filling a pulp tower |
| 10/22/1997 | EP0802228A2 Silicone compositions and uses thereof |
| 10/21/1997 | US5679286 Mixture of fatty alcohol, ketone and wax; papermaking, food, starch, paint or sewage treatment industries |
| 10/21/1997 | US5679217 Decreasing liquor-to-wood ratio in digester while increasing in pre-impregnation vessel |
| 10/16/1997 | WO1997038157A1 Process for continuously guiding liquids when digesting pulp in a digester |
| 10/16/1997 | WO1997038156A1 Process for continuously supplying liquid during the boiling of cellulose in a boiler |
| 10/14/1997 | US5676795 Digestion |
| 10/09/1997 | WO1997037007A1 Enzyme multimer and process of producing same |
| 10/08/1997 | CN2264197Y Mica hydraulic power slurrying machine |
| 10/07/1997 | US5674359 Continuous cooking of cellulosic fibrous material with cold alkali impregnation |
| 10/07/1997 | US5674358 Repulping wet strength paper and paperboard with persulfate and a carbonate buffer |
| 10/01/1997 | EP0797670A1 Fungal cellulases |
| 10/01/1997 | CN1160768A Concurrent xylose, glucose, oxalic acid, lignin and cellulose-producing pollutionless process with straw as material |
| 09/30/1997 | US5672245 Rejected flow from cooking pulp consisting of knots is returned to chip chute after concentration and washing |
| 09/25/1997 | WO1997035067A1 Antifoam compositions containing polymers and methods of use thereof |
| 09/24/1997 | EP0796367A1 Production of prehydrolyzed pulp |
| 09/24/1997 | EP0685015B1 Straining device |
| 09/24/1997 | CN1160426A Sulphite fusion process |
| 09/12/1997 | WO1997033035A1 A process for rapid acid hydrolisis of lignocellulosic material and hydrolisis reactor |
| 09/04/1997 | WO1997032075A1 Process for the production of lignin and microcellulose |
| 09/04/1997 | CA2247949A1 Process for the production of lignin and microcellulose |
| 09/03/1997 | EP0792394A1 Black liquor impregnation in single-vessel hydraulic digester |
| 09/02/1997 | US5662775 Countercurrent cooking zone at first level and extraction screen at second level |
| 08/27/1997 | EP0791099A1 Cellulose extraction process |
| 08/26/1997 | US5660686 Cooking with spent liquor pretreatment of cellulose material |
| 08/26/1997 | CA2096277C Surfactants as kraft pulping additives for reject reduction and yield increase |
| 08/19/1997 | US5658428 Method for impregnation in a single-vessel hydraulic digester |
| 08/14/1997 | WO1997029236A1 Method for continuous cooking of cellulose-containing fibre material |
| 08/14/1997 | WO1997019220A3 Process for preparing a pulp-cooking solution |
| 08/13/1997 | CN1156772A Technique for manufacturing straw pulp and its product by machining |
| 08/07/1997 | WO1997028305A1 Process and apparatus for treatment of fibrous raw material |
| 08/07/1997 | DE19603491A1 Production of fibrous cellulose@ material free from other plant components |
| 08/07/1997 | CA2244933A1 Process and apparatus for treatment of fibrous raw material |
| 08/06/1997 | EP0787231A1 Polyoxometalate delignification and bleaching |
| 08/06/1997 | EP0669998B1 Digester for continuous cooking of fibre material |
| 07/30/1997 | EP0785815A1 Defoamer composition and method of using the same |
| 07/30/1997 | CN1035522C Separating method of vegetable cellulose and non-cellulose |
| 07/24/1997 | WO1997026404A1 Pulping ligno-cellulosic material using high frequency radiation |
| 07/24/1997 | WO1997026403A1 Process of producing raw material for synthetic and other fibres from herbaceous plants and products so obtained |
| 07/24/1997 | WO1997026402A1 Delignification of lignocellulosic material with a cooking liquor containing phenols and pyrazolidones |
| 07/24/1997 | CA2244866A1 Pulping ligno-cellulosic material using high frequency radiation |
| 07/22/1997 | US5650045 Apparatus and method for wood pulp digester |
| 07/22/1997 | CA2105412C Repulping paper and paperboard |
| 07/16/1997 | EP0584161B1 White liquor preparation and pulping process |
| 07/09/1997 | EP0782642A1 Method and apparatus for the continuous production of cellulosic pulp |
| 07/08/1997 | US5645762 Defoamer composition and method of using the same |
| 07/02/1997 | CN1153240A Pollution-free paper making method |
| 07/01/1997 | US5643410 Batch process for preparing kraft pulp in a batch digesting process |
| 06/26/1997 | WO1997022749A1 Process for treating refiner pulp |
| 06/25/1997 | EP0780511A2 Method of producing pulp for paper manufacture |
| 06/25/1997 | EP0780510A2 A process for the production of cellulose |
| 06/24/1997 | US5640994 Liquid reservoir |
| 06/12/1997 | WO1997020920A1 Novel xylanase composition and method for production thereof |
| 06/11/1997 | EP0777780A1 Sulphite fusion process |
| 06/11/1997 | CN1151459A Intermittence and continuous steaming tech. and appts. by means of sulphate method |
| 06/11/1997 | CN1151458A Paper-making pulping process without black liquid |
| 06/05/1997 | WO1997020102A1 Method and apparatus for continuously preparing cellulose pulp |
| 06/04/1997 | EP0776394A1 Enhancements in pulping with dissolved solids control |
| 06/04/1997 | EP0670924B1 Method of continuously cooking pulp |
| 06/03/1997 | US5635026 Cooking cellulose material with high alkali concentrations and/or high pH |
| 05/29/1997 | WO1997019221A1 Method of obtaining cellulose fibre material from a plant substrate containing calcium pectinate |
| 05/21/1997 | EP0673452B1 Digester for continuous cooking of fibre material |
| 05/09/1997 | WO1997010384A3 Process and arrangement for monitoring cellulose digestion |
| 05/07/1997 | CN1034824C Straining device |
| 05/07/1997 | CN1034823C Paper, paper plate and cellulose plate pulping method |
| 04/29/1997 | US5624616 Heating waste chips under steam and pressure to soften lignin, comminuting, drying |