| Patents for D21C 1 - Pretreatment of the finely-divided materials before digesting (1,872) |
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| 03/29/1991 | CA2067129A1 Process for manufacturing chemo-mechanical and/or chemo-thermal-mechanical wood pulps |
| 03/19/1991 | CA1281714C Procedure for recirculating phenol in a lignocellulosic materials digestion process |
| 03/06/1991 | WO1991003595A1 The treatment of wood chips |
| 03/06/1991 | CA2064062A1 Treatment of wood chips |
| 03/05/1991 | US4997488 Combined physical and chemical treatment to improve lignocellulose digestibility |
| 02/26/1991 | US4995943 Compression, decompression |
| 02/13/1991 | CN1049201A Method of separating short-staple in cottonseed shell |
| 12/19/1990 | EP0403068A2 Improvements in and/or relating to a process for preparing a hydrolysed lignocellulosic material |
| 11/28/1990 | CN1047300A Improvements in and/or relating to process for preparing hydrolysed lignocellulosic material |
| 11/27/1990 | US4972960 Disk screen with compressible spacers and flanged surrounds |
| 11/11/1990 | CA2016445A1 Process for preparing a hydrolysed lignocellulosic material |
| 11/06/1990 | US4968385 Method of preparing a plup using a fluidizing centrifugal pump during impregnation |
| 10/06/1990 | WO1990011836A1 Device for separating fibres and gas |
| 10/06/1990 | CA2048660A1 Device for separating fibres and gas |
| 09/12/1990 | EP0387187A2 Process for reducing the pitch content in pulpwood |
| 09/12/1990 | EP0386082A1 Method and plant for producing high-grade pulp from chip material containing lignocellulose |
| 09/04/1990 | US4953795 Wood chip cracking apparatus |
| 08/07/1990 | US4946946 Acidification and agitation of solution; precipitation |
| 07/31/1990 | CA1272309A1 Process for the decolorization of pulp mill process streams |
| 07/20/1990 | WO1990008221A1 A method in the manufacture of cellulose pulp |
| 07/20/1990 | CA2045497A1 Method in the manufacture of cellulose pulp |
| 07/18/1990 | EP0377981A2 Process for improved alkaline oxidative delignification of cellulose pulp |
| 06/20/1990 | CA2005369A1 Process for improved alkaline oxidative delignification of cellulose pulp |
| 06/14/1990 | WO1990006394A1 Device for chip washing |
| 05/25/1990 | CA2003768A1 Device for chip washing |
| 05/03/1990 | WO1990004672A1 Wood chip cracking apparatus |
| 04/25/1990 | EP0364632A1 Production of lignin |
| 03/22/1990 | WO1990002835A1 Method of making chemi-mechanical pulp from hardwood |
| 03/13/1990 | US4907702 Automatic chip classifier and system |
| 02/07/1990 | CN1039458A Method for separating short cotton fibres from cottenseed shells |
| 01/24/1990 | CN1038921A Improved alkaline peroxide treatment of nonwoody lignocellulosic substrates |
| 01/17/1990 | CN1038849A Method of preparing pulp |
| 01/10/1990 | CN1038598A Procedure and apparatus for sorting of wood chips |
| 12/27/1989 | CN1006199B Process for the decolorization |
| 12/21/1989 | DE3919610A1 Method and device for sorting wood shavings |
| 12/06/1989 | EP0344462A1 Continuous cooking pulp quality enhancements |
| 09/19/1989 | US4867845 Vertical steaming vessel |
| 09/08/1989 | WO1989008165A1 Process for the pre-treatment of chips |
| 08/30/1989 | EP0330387A2 Improved method and apparatus for processing pulp |
| 08/10/1989 | WO1989007170A1 Process and equipment for pretreatment of cellulosic raw material |
| 07/26/1989 | EP0325554A2 Automatic chip classifier and system |
| 07/13/1989 | WO1989006293A1 Method and device for crushing a fibrous material |
| 05/18/1989 | WO1989004394A1 Method and plant for producing high-grade pulp from chip material containing lignocellulose |
| 04/06/1989 | WO1989002951A1 Method of impregnating lignocellulose material |
| 04/05/1989 | EP0309998A2 A method in the activation of lignocellulosic material with a gas containing nitrogen dioxide |
| 01/17/1989 | US4798651 Process for preparing pulp for paper making |
| 11/24/1988 | DE3715953A1 Cellulose preparation and sterilisation process for further processing, for alcohol production, for mushroom cultures, for the paper industry and chemical industry or the like, and apparatus for carrying out the process |
| 11/22/1988 | CA1245011A1 Countercurrent acid hydrolysis |
| 10/26/1988 | EP0287960A2 A process for the production of a hemicellulose hydrolysate and special pulp |
| 10/20/1988 | WO1988007988A1 Porphyrins, their syntheses and uses thereof |
| 09/28/1988 | EP0284585A2 Improved process for preparing pulp for paper making |
| 09/13/1988 | CA1241859A1 Chip presteaming and air washing |
| 08/17/1988 | CN85107578B Technology of chemical machinery method of pulpmaking with reed to make paperplate |
| 08/16/1988 | US4764251 Method for the impregnation and cooking of lignocellulosic material by a batch cooking using spent impregnation liquor from a previous batch |
| 08/09/1988 | US4762591 Apparatus for reacting lignocellulosic material with a gas phase comprising a nitrogen oxide and oxygen under controlled gas pressure |
| 07/06/1988 | EP0273759A2 Procedure for recirculating phenol in a lignocellulosic materials digestion process |
| 06/21/1988 | CA1238222A1 Method and apparatus for pre-treating lignocellulosic material in the continuous digestion of lignocellulosic material to cellulose pulp |
| 06/14/1988 | US4750973 Process for reducing carbohydrate losses in the sulfate pulping of wood by pretreating the wood with oxygen and nitrogen oxides |
| 05/24/1988 | US4746404 Paper pulp production |
| 05/10/1988 | US4743338 Method of removing air from lignocellulosic material by passing the material through conduit paths of different diameters |
| 02/16/1988 | CA1232785A1 Apparatus for treating lignocellulosic material with a gas phase |
| 02/02/1988 | CA1232109A1 Pulping process |
| 01/26/1988 | US4721231 Vessel for holding/discharging loose bulk material |
| 12/15/1987 | CA1230208A1 Process for preparing pulp for paper making |
| 12/15/1987 | CA1230207A1 Method for the production of cellulose by the batch cooking process |
| 09/22/1987 | US4695386 Process for the decolorization of pulp mill process streams |
| 09/15/1987 | CA1226705A1 Chemithermomechanical pulping process employing separate alkali and sulfite treatments |
| 06/24/1987 | EP0226227A2 Chip presteaming and air washing |
| 06/03/1987 | EP0224470A1 Process for producing cellulose pulp from fibrous plant material |
| 05/26/1987 | US4668340 Method of countercurrent acid hydrolysis of comminuted cellulosic fibrous material |
| 05/06/1987 | CN85107578A Technology of chemical machinery method of pulpmaking with reed to make paperplate |
| 03/11/1987 | EP0213376A1 Process for the delignification of cellulosic materials |
| 03/10/1987 | CA1218808A1 Nonsulphur chemimechanical pulping process |
| 03/04/1987 | EP0212329A1 Process for the delignification of cellulosic materials |
| 01/20/1987 | CA1216709A1 Treatment of wood-chips |
| 12/30/1986 | US4632729 Efficiency; flashing prevention; paper pulps |
| 12/30/1986 | EP0091457B1 A method of polysulphide treatment in alkaline pulping of lignocellulose material |
| 11/26/1986 | EP0202382A2 Process for the decolourization of pulp mill process streams |
| 11/19/1986 | CN85108743A Process for the decolorization |
| 07/08/1986 | US4599138 Process for pretreating particulate lignocellulosic material to remove heavy metals |
| 06/03/1986 | US4592804 Method for pre-treating lignocellulosic material in two steaming zones |
| 12/31/1985 | US4561936 Process for the conversion of lignocellulosic material to cellulose pulp by alkaline preoxidation followed by alkaline oxygen-free digestion both in the presence of a redox additive |
| 11/21/1985 | EP0161330A1 Chip presteaming and air washing |
| 11/12/1985 | US4552616 Lignocellulose, drying, softening, efficiency, defibering, pollution control |
| 10/15/1985 | US4547263 Method for obtaining useful products from green pseudostem, including papermaking pulp plantain |
| 09/24/1985 | CA1193808A1 Chemical pulp having improved strength, drainability and beatability, and a process of making said pulp |
| 06/18/1985 | CA1189005A1 Acid hydrolysis, caustic extraction, material treatment |
| 06/06/1985 | WO1985002423A1 A method for the production of cellulose by the batch cooking process |
| 01/08/1985 | CA1180512A1 Process for reducing carbohydrate losses in the sulfate pulping of wood by pretreating the wood with oxygen and nitrogen oxides |
| 12/04/1984 | US4486267 Chemithermomechanical pulping process employing separate alkali and sulfite treatments |
| 11/13/1984 | CA1177609A1 Process to produce pulps |
| 09/04/1984 | CA1173604A1 Production of chemimechanical pulp |
| 09/04/1984 | CA1173602A1 Process for producing special high alpha-cellulose pulps by means of a multistage cook including an acid prehydrolysis |
| 07/31/1984 | US4462865 Delignification of lignocellulosic materials with 2-imidazolidinones and 2-oxazolidinones |
| 07/24/1984 | US4461648 Method for increasing the accessibility of cellulose in lignocellulosic materials, particularly hardwoods agricultural residues and the like |
| 06/26/1984 | US4456750 Method for controlling the alkalinity of feed circulation when prehydrolyzing wood chips |
| 06/19/1984 | CA1169285A1 Process for heating up wood chips prior to steaming and pulping |
| 06/12/1984 | CA1168951A1 Process for the production of a cation exchanger, and a use of same |
| 03/13/1984 | US4436586 Method of producing kraft pulp using an acid prehydrolysis and pre-extraction |
| 03/13/1984 | CA1163486A1 Chip bin blockage preventing |