| Patents for D21C 9 - After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters (10,265) |
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| 06/13/1991 | DE3940827A1 Verfahren zum kontinuierlichen bleichen von fluessigkeiten mit ozon Method for continuous bleaching liquids with ozone |
| 06/13/1991 | CA2031972A1 Procedure for the production of pulp |
| 06/12/1991 | CN1052157A High efficienecy chlorine dioxde pulp bleaching process |
| 06/11/1991 | US5022962 Method for the treatment of spent liquors in pulp production |
| 06/05/1991 | EP0430915A1 Procedure for the production pulp |
| 06/05/1991 | EP0429767A1 Delignification of lignocellulose-containing fiber |
| 06/05/1991 | CN1051951A Chlorime dioxide pulp bleaching process using sequential chlorine addition |
| 06/04/1991 | US5021159 Apparatus for thickening pulp and paper stock |
| 06/04/1991 | US5021126 Drum washer having liquid collecting means |
| 06/04/1991 | US5020178 Stabilizing pressure and flow conditions in a screening apparatus |
| 06/04/1991 | CA1284563C Process for improving dimensional stability and biological resistance of lignocellulosic material |
| 06/04/1991 | CA1284558C Bleaching of cellulosic pulps using hydrogen peroxide |
| 06/04/1991 | CA1284557C Process for preparing pulp out of lignocellulosic raw material |
| 06/04/1991 | CA1284556C Process for controlling pulp bleaching systems |
| 05/29/1991 | EP0429422A1 Procedure for the production of pulp |
| 05/29/1991 | EP0429241A1 Process for alkaline peroxide bleaching of wood pulp using a quaternary amine as additive |
| 05/29/1991 | EP0429112A2 Absorbent structure containing individualized, polycarboxylic acid crosslinked fibers |
| 05/29/1991 | EP0428512A1 Ozone generation by corona discharge at elevated pressures. |
| 05/28/1991 | CA2030836A1 Procedure for the production of pulp |
| 05/22/1991 | EP0428004A1 Centrifugal washer for paper pulp |
| 05/22/1991 | CN1051600A Dye transfer inhibition |
| 05/18/1991 | CA2030186A1 Procedure for the production of pulp |
| 05/16/1991 | DE3937932A1 Delignification and bleaching of pulp with alkali chlorite - by adding chlorite before acidification to produce nascent reagent, minimising pollution |
| 05/16/1991 | CA2029923A1 Process for alkaline peroxide bleaching of wood pulp using a quaternary amine as additive |
| 05/15/1991 | EP0427317A2 Process for preparing individualized, polycarboxylic acid crosslinked fibers |
| 05/15/1991 | EP0427316A2 Individualized, polycarboxylic acid crosslinked fibers |
| 05/14/1991 | US5015335 Chlorine dioxide static distributor |
| 05/14/1991 | US5015333 Cooking and washing pulp in a multistage batch digestion process |
| 05/13/1991 | CA2005848A1 Centrifugal washer for paper pulp |
| 05/12/1991 | CA2023916A1 Delignification of lignocellulose-containing fiber |
| 05/09/1991 | WO1991007542A1 Hydrolysis of resin in pulp |
| 05/09/1991 | CA2072993A1 Hydrolysis of resin in pulp |
| 05/08/1991 | EP0426652A1 Process for the chlorine-free bleaching of pulp |
| 05/07/1991 | US5013460 Perforated cylinder |
| 05/07/1991 | US5013404 Paper with improved brightness |
| 05/02/1991 | WO1991005858A1 A microperoxidase preparation containing a hemopeptide as an active component |
| 05/01/1991 | CN1051062A Deinking and bleaching secondary fiber |
| 05/01/1991 | CN1051061A Improvement of vacuum system device of belt-type vacuum pulp-washing machine |
| 04/30/1991 | US5011572 Two stage process for the oxygen delignification of lignocellulosic fibers with peroxide reinforcement in the first stage |
| 04/24/1991 | CN1012443B Centrifugal filtration countercurrent pulp washer and its process |
| 04/23/1991 | US5009746 Method for removing stickies from secondary fibers using supercritical CO2 solvent extraction |
| 04/20/1991 | WO1991005910A1 Chlorine dioxide pulp bleaching process using sequential chlorine addition |
| 04/20/1991 | WO1991005909A1 High efficiency chlorine dioxide pulp bleaching process |
| 04/20/1991 | CA2069322A1 High efficiency chlorine dioxide pulp bleaching process |
| 04/20/1991 | CA2067750A1 Chlorine dioxide pulp bleaching process using sequential chlorine addition |
| 04/19/1991 | WO1991005908A1 Method for bleaching with reduced organic chlorides |
| 04/19/1991 | CA2044279A1 Method for bleaching with reduced organic chlorides |
| 04/14/1991 | WO1991005839A1 Dye transfer inhibition |
| 04/10/1991 | EP0421843A1 Process for treating a papermaking pulp with an enzymatic preparation to make paper or cardboard |
| 04/10/1991 | EP0420860A1 Process and apparatus for the manufacture of pulp for paper, board, fiberboard and similar products. |
| 04/03/1991 | CA2026652A1 Papermaking process usding enzymatic preparation for the making of paper or cardboard |
| 04/02/1991 | US5004523 Delignification of lignocellulosic materials with monoperoxysulfuric acid |
| 04/02/1991 | CA1282226C Apparatus or device for the treatment of a material made to pass between at least two endless permeable belts, for instance screen belts, or the like conveying means |
| 04/02/1991 | CA1282212C Process for controlling pitch deposition from pulp in papermaking systems |
| 04/02/1991 | CA1282209C Delignification and bleaching of a cellulose pulp with an alkali-oxygen-hypochlorite extraction |
| 03/27/1991 | CN1050241A Lignin separator and purifying technique for black liquor |
| 03/26/1991 | CA1281855C High consistency peroxide bleaching |
| 03/20/1991 | EP0418201A2 Bleaching wood pulp with enzymes |
| 03/20/1991 | EP0417411A1 Process for stabilizing the viscosity of pulp |
| 03/19/1991 | US5000874 Concentrated compositions and their use as stabilizers for peroxide-containing alkaline liquors |
| 03/19/1991 | US5000658 Apparatus for pumping high consistency fiber suspension |
| 03/19/1991 | CA1281714C Procedure for recirculating phenol in a lignocellulosic materials digestion process |
| 03/19/1991 | CA1281509C Process for decolorizing bulk-dyed paper and self copying paper |
| 03/13/1991 | CA2025079A1 Bleaching wood pulp with enzymes |
| 03/12/1991 | US4999085 Simplification of process |
| 03/12/1991 | CA1281153C Process for the activation and delignification of cellulose pulp |
| 03/07/1991 | WO1991002840A1 Improvement of oxygen bleaching of pulp |
| 03/06/1991 | EP0415193A2 Finely divided suspension of cellulosic material and process for producing the same |
| 03/06/1991 | EP0415149A2 Process for bleaching and delignification of lignocellulosic materials |
| 03/05/1991 | US4997523 Alkoxylated diamine, phosphate or phosphonate |
| 02/26/1991 | WO1991002839A1 Process for treatment of lignocellulosic pulp |
| 02/26/1991 | US4995988 Method and apparatus for thickening a slurry using a compression plate |
| 02/26/1991 | US4995983 Membrane separation process |
| 02/26/1991 | CA2065244A1 Process for treatment of lignocellulosic pulp |
| 02/19/1991 | US4994145 Process for producing a constant distribution of a selected property across the width of pulp mat on a pulp washing surface |
| 02/19/1991 | CA1280257C Hydrophilic cellulose product and method of its manufacture |
| 02/13/1991 | EP0412250A1 Apparatus for dewatering, especially press belt filter |
| 02/13/1991 | CN1049201A Method of separating short-staple in cottonseed shell |
| 02/11/1991 | CA2022779A1 Dewatering device |
| 02/07/1991 | WO1991001268A1 Stabilized aqueous solution of hydrogen peroxide and preparation method |
| 01/29/1991 | US4988484 High efficiency ozone generator for sterilizing, bleaching and the like |
| 01/29/1991 | CA1279518C Apparatus for mixing chemicals in fibre suspensions |
| 01/25/1991 | WO1991001409A1 Cell wall loading of never-dried pulp fibers |
| 01/23/1991 | EP0409612A1 Histidine-hydrogen peroxide adduct and process for preparing same |
| 01/23/1991 | EP0409456A2 Pump with separate fluidizing vaned shaft adjacent impeller |
| 01/23/1991 | EP0408803A1 Procedure for the bleaching of sulphate pulp |
| 01/22/1991 | US4986881 Washing and thickening |
| 01/19/1991 | CA2021392A1 Process of stabilizing the viscosity & strength of pulps |
| 01/16/1991 | EP0407421A1 Procedure for bleaching cellulose pulp. |
| 01/15/1991 | US4985120 Method for controlling pitch deposits in pulp and papermaking processes with organotitanium (IV) compound |
| 01/10/1991 | WO1991000386A1 A method for bleaching kraft pulp with a mixture of oxygen and peroxide |
| 01/09/1991 | EP0406617A2 Enzymatic delignification of lignocellulosic material |
| 01/09/1991 | EP0279845A4 Pulp bleaching process |
| 01/09/1991 | CN1011146B High consistency pressure screen and method of separating accepts and rejects |
| 01/08/1991 | US4983256 Method for the manufacture of a paper pulp for currency use |
| 01/08/1991 | CA1278718C Apparatus for liquid treatment of pulp |
| 01/07/1991 | WO1991000768A1 Method and apparatus for treating fiber suspension |
| 01/07/1991 | WO1991000767A1 Filter cylinder |
| 01/02/1991 | EP0406221A2 Liquid treatment of and liquid extraction on a paper pulp |
| 01/02/1991 | EP0267190B1 Apparatus for mixing chemicals in fibre suspensions |