| Patents for D21C 3 - Pulping cellulose-containing materials (5,020) |
|---|
| 05/07/1992 | CA2055040A1 Pulping |
| 05/06/1992 | EP0483163A1 Environmentally improved process for bleaching lignocellulosic materials. |
| 04/28/1992 | CA1299322C Apparatus and methods for reducing the formation of scale in pulping operations |
| 04/25/1992 | WO1992007994A1 Pulping process |
| 04/02/1992 | WO1992005309A1 Process for producing chemical pulp |
| 04/02/1992 | CA2068642A1 Process for the preparation of chemical pulp |
| 04/01/1992 | CN1059946A Technology for making paper pulp with pure tobacco stalk by imine method |
| 03/25/1992 | EP0477059A2 Impregnation with black liquor prior to white liquor introduction |
| 03/25/1992 | EP0476230A2 Extended kraft cooking with white liquor added to wash circulation |
| 03/04/1992 | EP0472820A2 Continuous solvent pulping and washing processes and apparatus |
| 02/19/1992 | EP0471154A2 Sulfite modified continuous digesting |
| 02/18/1992 | US5089089 System for sulfonating mechanical pulp fibers |
| 02/18/1992 | US5089086 Process for continuous cooking of cellulose |
| 02/18/1992 | CA2042885A1 Continuous solvent pulping and washing processes and apparatus |
| 02/18/1992 | CA2030090A1 Sulfite modified continuous digesting |
| 02/05/1992 | CN1015387B Pulp-making method from soybean stalk |
| 02/04/1992 | CA1295095C Process for the production of a hemicellulose hydrolysate and special pulp |
| 01/29/1992 | EP0468016A1 Process for preparing kraft pulp. |
| 01/15/1992 | EP0465579A1 Improved method of producing pulp |
| 01/14/1992 | US5080755 Process for the continuous digestion of cellulosic fiber material |
| 01/14/1992 | CA1294091C Method of intensifying the washing of a fibre suspension |
| 12/31/1991 | US5077394 Tetraphenyl-type with electronegative substituents; oxidation catalysts for alkanes and alkenes |
| 12/14/1991 | CA2019004A1 High yield pulping and bleaching process for the production of pulp of high strength and high brightness for papermaking |
| 12/12/1991 | WO1991018864A1 Process for the recovery of a lower aliphatic acid |
| 12/12/1991 | WO1991018863A1 Process for the recovery of aliphatic acids and sugars |
| 11/19/1991 | US5066362 Extended delignification in pressure diffusers |
| 11/18/1991 | WO1991018145A1 Environmentally improved process for bleaching lignocellulosic materials |
| 11/06/1991 | EP0454757A1 A method in the manufacture of cellulose pulp. |
| 10/22/1991 | US5059284 Apparatus to displace a digester from both ends |
| 10/22/1991 | US5059281 Process and mechanism to empty pulping digester |
| 10/01/1991 | US5053108 High sulfidity cook for paper pulp using black liquor sulfonization of steamed chips |
| 09/24/1991 | CA1289305C Production of high strength linerboard with oxygen and alkali |
| 09/18/1991 | EP0446556A1 A method for fractionation of lignins from steam exploded lignocellulosics to provide fractions with different, but reproducible properties, and some methods for their interconversions and the products so produced |
| 09/18/1991 | CN1013973B Process for preparation of potassium salts from pulping of lignocellulosic materials |
| 09/17/1991 | US5049236 Lignin derived quinonic compound mixtures useful for the delignification of cellulosic materials |
| 09/11/1991 | EP0445321A1 Process for making pulp in a continuous digester |
| 09/04/1991 | EP0444335A1 Methods for producing bleached, mercerized and unmercerized cellulose and for producing cellulose triacetate therefrom |
| 08/22/1991 | WO1991012368A1 Process for preparing kraft pulp |
| 08/21/1991 | EP0442806A1 A process for producing pulp from a lignocellulosic-containing material |
| 08/20/1991 | US5041237 Aqueous solution containing sulphur dioxide and sodium in high percentages, its manufacture and use |
| 08/20/1991 | US5041192 Pulping by use of sodium hydroxide, sodium sulfide and/or sodium bisulfate |
| 08/14/1991 | WO1991012367A1 Ctmp-process |
| 08/13/1991 | CA2036311A1 Process for producing pulp from a lignocellulosic-containing material |
| 07/23/1991 | US5034095 Feeding cellulose containing alkali and oxygen, slurrying, discharging |
| 07/23/1991 | CA1286455C High yield chemical pulping |
| 07/16/1991 | WO1991010774A1 Environmental pulp, method for its manufacture and use of pulp |
| 07/16/1991 | US5032224 Digestion, delignification, digestion additive |
| 07/16/1991 | US5032223 Analyzing decomposition products |
| 07/16/1991 | CA2072585A1 Environmental pulp, method for its manufacture and use of pulp |
| 07/10/1991 | EP0436133A1 The use of neutral paper as a package material for a photosensitive material |
| 07/10/1991 | CN1013130B Method for producing double gummed paper with full-reed pulp |
| 07/10/1991 | CA2018415A1 Method of enhancing green liquor semi-chemical pulp production |
| 07/03/1991 | EP0434696A1 Method of making chemi-mechanical pulp from hardwood |
| 07/03/1991 | EP0434692A1 Supercritical delignification of wood |
| 06/19/1991 | EP0433258A1 Procedure for the production of pulp |
| 06/19/1991 | EP0432310A1 A method for extracting the chemical components from dissociated lignocellulosic material |
| 06/13/1991 | WO1991008337A1 A process for the preparation of cooking liquors having high sulphidity for sulphate pulp cooking |
| 06/13/1991 | CA2031972A1 Procedure for the production of pulp |
| 06/11/1991 | US5023103 Fiber and method of making |
| 06/11/1991 | US5023097 Using hydrogen peroxide and an alkali |
| 06/05/1991 | EP0430915A1 Procedure for the production pulp |
| 06/05/1991 | CN1051953A Process for preparation of cooking liquors having high sulphidity for sulphate pulp cooking |
| 06/04/1991 | US5021127 Extended delignification in pressure diffusers |
| 06/04/1991 | CA1284637C Biomass fractionation process |
| 06/04/1991 | CA1284557C Process for preparing pulp out of lignocellulosic raw material |
| 05/29/1991 | EP0429422A1 Procedure for the production of pulp |
| 05/28/1991 | CA2030836A1 Procedure for the production of pulp |
| 05/18/1991 | CA2030186A1 Procedure for the production of pulp |
| 05/16/1991 | WO1991005103A3 Displacement heating in continuous digesters |
| 05/16/1991 | DE3937932A1 Delignification and bleaching of pulp with alkali chlorite - by adding chlorite before acidification to produce nascent reagent, minimising pollution |
| 05/15/1991 | CN1051404A Method and apparatus to displace digester from both ends |
| 05/07/1991 | WO1991006700A1 A method of producing cellulosic pulp |
| 05/07/1991 | CA2073048A1 Method of producing cellulosic pulp |
| 05/01/1991 | WO1991006702A1 Method and apparatus to displace spent liquors in a digester |
| 04/30/1991 | CA1283512C Sulfite cooking method for the production of cellulose from materials containing lignocellulose with recovery of the cooking chemicals |
| 04/18/1991 | WO1991005104A1 Isolation of lignin from solvent pulping liquors |
| 04/16/1991 | CA1282911C Delignification process for ligno-cellulosic materials |
| 04/11/1991 | DE3932347A1 Herstellung chemo-mechanischer und/oder chemo-thermo-mechanischer holzstoffe Chemo-mechanical preparation and / or chemo-thermo-mechanical wood materials |
| 04/10/1991 | EP0420860A1 Process and apparatus for the manufacture of pulp for paper, board, fiberboard and similar products. |
| 04/10/1991 | CN1050579A Displacement heating in continuous digesters |
| 04/10/1991 | CN1050578A Process for mechanism to empty pulping digester |
| 04/03/1991 | EP0420791A2 Process and mechanism to empty pulping digester |
| 04/03/1991 | EP0420771A1 Isolation of lignin from solvent pulping liquors |
| 04/02/1991 | US5004523 Delignification of lignocellulosic materials with monoperoxysulfuric acid |
| 04/02/1991 | CA1282208C Pulping additive composition and process |
| 03/29/1991 | WO1991005103A2 Displacement heating in continuous digesters |
| 03/29/1991 | WO1991005102A1 Process for manufacturing chemo-mechanical and/or chemo-thermo-mechanical wood pulps |
| 03/29/1991 | CA2067129A1 Process for manufacturing chemo-mechanical and/or chemo-thermal-mechanical wood pulps |
| 03/26/1991 | US5002634 Method for the delignification of wood pulp utilizing fused ring quinone compounds prepared from lignin or lignin derived substances |
| 03/20/1991 | CN1012088B Pulping process |
| 03/19/1991 | CA1281714C Procedure for recirculating phenol in a lignocellulosic materials digestion process |
| 03/13/1991 | EP0415959A1 Delignification of non-woody biomass. |
| 03/13/1991 | CN1011970B Method for using chinese alpine rush as raw material to make nitrocellulose |
| 01/09/1991 | EP0407371A2 Continuous cooking with reduced cost, horsepower and pulp degradation |
| 01/09/1991 | EP0407370A2 High sulfidity cook for paper pulp using black liquor sulfonization of steamed chips |
| 12/27/1990 | EP0245237B1 Method of obtaining cellulase deficient strains of white-rot fungi |
| 12/27/1990 | CA1278294C Method for fractionation of lignins from steam exploded lignocellulosics to provide fractions with different, but reproducible properties,and some methods for their interconversions and the products so produced |
| 12/19/1990 | CN1047899A Pulp-making method from soybean stalk |
| 12/18/1990 | US4978426 Production of high strength linerboard with oxygen and alkali |
| 12/05/1990 | CN1010699B Bamboo as pulp making fiber |