| Patents for D21C 1 - Pretreatment of the finely-divided materials before digesting (1,872) |
|---|
| 03/06/1984 | CA1163058A1 Method for obtaining superior yields of accessible cellulose and hemicellulose from lignocellulosic materials |
| 02/28/1984 | CA1162703A1 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 |
| 10/19/1983 | EP0091457A1 A method of polysulphide treatment in alkaline pulping of lignocellulose material. |
| 10/11/1983 | CA1154912A1 Chip treatment |
| 08/30/1983 | US4401811 Water pollution control; food processing plants; demetallization |
| 08/30/1983 | US4401510 Process for heating up wood chips prior to steaming and pulping |
| 08/30/1983 | CA1152710A1 Pulp containing hydrophilic debonder and process for its application |
| 08/02/1983 | CA1150942A1 Cellulosic fiber insulation and process of preparation |
| 06/14/1983 | CA1147910A1 Continuous pretreatment of lignocellulose with anthraquinone prior to pulping |
| 06/01/1983 | EP0079927A1 A method for treating a fibrous material and a plant for carrying out the method |
| 05/31/1983 | CA1147105A1 Process for depolymerization and extraction of lignin |
| 04/28/1983 | WO1983001469A1 A method of polysulphide treatment in alkaline pulping of lignocellulose material |
| 12/09/1982 | WO1982004271A1 A method for treating a fibrous material and a plant for carrying out the method |
| 10/26/1982 | US4356213 Wood, impregnation, washing |
| 10/05/1982 | CA1132763A1 Use of cyclic keto compounds as additives in vapor phase pulping process |
| 08/10/1982 | CA1129163A1 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 |
| 07/13/1982 | CA1127358A1 Method of manufacturing sulphate pulp |
| 06/30/1982 | EP0054777A2 Process for preparing a cation exchanger, and its use |
| 05/18/1982 | CA1123554A1 High yield chemimechanical pulping processes |
| 03/18/1982 | WO1982000838A1 A method for preheating wood chips |
| 01/27/1982 | EP0044658A1 Improved method of increasing the accessibility of cellulosic material in lignocellulosic materials |
| 01/12/1982 | US4310383 Continuous countercurrent pretreatment of lignocellulose with anthraquinone prior to pulping |
| 09/15/1981 | US4289579 Method for treating a bulk material with a fluid |
| 09/01/1981 | CA1107920A1 System for presteaming wood chips at or near atmospheric pressure with minimum displacement of air |
| 07/28/1981 | CA1105660A1 Solvent vapor extraction of wood |
| 05/26/1981 | CA1101616A1 Method of producing coniferous wood celluloses by the sulphite process on a magnesium basis |
| 04/07/1981 | CA1098657A1 Method of recovering heat as well as fractions containing volatile alcohols and sulphur compounds from black liquor in connection with pulping |
| 03/17/1981 | CA1097465A1 Black liquor energy recovery |
| 10/21/1980 | CA1087811A1 High yield, low cost cellulosic pulp |
| 09/02/1980 | CA1084749A1 Roller |
| 07/08/1980 | US4211605 Treatment with fulfur dioxide, sulfonation, difibering |
| 05/20/1980 | CA1077757A1 Chip steam distributor |
| 05/06/1980 | CA1076758A1 Wood pulping with amine and transition metal pretreating |
| 04/30/1980 | EP0010451A1 Process for the delignification of lignocellulosic material and products thereof |
| 04/22/1980 | CA1075858A1 Method and device for impregnation of fiber material before cooking by means of pulsation of pressure between digester pressure and a lower pressure |
| 04/01/1980 | CA1074609A1 Displacement impregnation |
| 03/18/1980 | CA1073613A1 Method of processing wood chips |
| 02/26/1980 | US4190490 Presteaming, agitation, cooking |
| 02/12/1980 | US4187594 Roll for pressure treating webs of material |
| 11/20/1979 | US4174997 Method and apparatus for continuous hydrolysis of cellulosic fiber material |
| 10/23/1979 | US4172006 Method of delignifying wood chips with oxygen by adding cooking liquor under pressure |
| 10/23/1979 | CA1064748A1 Process of making pulp from lignocellulose containing material |
| 08/21/1979 | US4165253 Process for producing pulp |
| 06/28/1979 | WO1979000375A1 Method of treating a bulk material and apparatus for carrying out the method |
| 06/26/1979 | CA1057007A1 Impregnation of wood particles |
| 05/01/1979 | CA1053494A1 Nip roll for treating web material and method of manufacturing same |
| 03/13/1979 | CA1050212A1 Method of increasing pulp yield and viscosity |
| 11/28/1978 | US4127439 Pretreatment of lignocellulose with anthraquinone prior to pulping |
| 11/07/1978 | US4124440 Chip bin steam distributor with a vibrating discharge |
| 10/24/1978 | CA1040912A1 Method and apparatus for the treatment of waste wood, such as stumps and snag, to make it suitable for the production of paper pulp |
| 10/03/1978 | US4118271 Milling, delignification, adding magnesium hydroxide, combustion, absorption, recirculation |
| 09/19/1978 | CA1038675A1 Method and device for selective impregnation of heterogenous fiber material before cooking |
| 09/12/1978 | CA1038113A1 Hydrolysis treatment |
| 09/05/1978 | US4111743 Method of recovering heat as well as fractions containing volatile alcohols and sulphur compounds from black liquor in connection with pulping |
| 08/15/1978 | US4106979 Preparation of paper pulps from dicotyledonous plants |
| 06/20/1978 | US4096027 System for presteaming wood chips at or near atmospheric pressure with minimum displacement of air |
| 06/06/1978 | US4092917 Nip roll for treating web materials |
| 05/30/1978 | US4092212 Selective impregnation of heterogenous fiber material before digestion |
| 05/30/1978 | US4091749 Alkaline pulping of lignocellulosic material with amine pretreatment |
| 05/09/1978 | US4088529 Method of resin seasoning wood chips |
| 05/02/1978 | US4087318 Oxygen-alkali delignification of lignocellulosic material in the presence of a manganese compound |
| 05/02/1978 | US4087317 Defiberizing lignocellulose |
| 01/31/1978 | US4071399 Apparatus and method for the displacement impregnation of cellulosic chips material |
| 01/24/1978 | US4070232 Prehydrolysis and digestion of plant material |
| 01/10/1978 | US4067768 Alkaline pulping of lignocellulosic material with amine and sulfate pretreatment |
| 11/08/1977 | US4057461 Method and apparatus for impregnation of fiber material by pressure pulsation |
| 09/27/1977 | US4050980 Selective delamination of wood chips |
| 08/30/1977 | US4045280 Ethanolamine or methylamine, copper or nickel nitrate |
| 07/19/1977 | US4036440 Method and apparatus for the treatment of waste wood, such as stumps and snag, to make it suitable for the production of paper pulp |
| 12/21/1976 | US3998688 Separating out lignin |
| 12/07/1976 | US3995354 Nip roll for treating web materials and method of manufacturing same |
| 05/04/1976 | US3954727 Acid hydrolysis, deaggregation |