| Patents for D21C 3 - Pulping cellulose-containing materials (5,020) |
|---|
| 04/07/1982 | EP0049221A1 Process for the delignification of lignocellulosic material |
| 04/01/1982 | WO1982001019A1 Process to produce pulps |
| 03/23/1982 | CA1120211A1 Process for the inhibition of the formation of deposits in cellulose pulping and cellulose pulp treating processes |
| 03/17/1982 | EP0047656A1 Process and apparatus for the oxygen delignification of pulp |
| 03/16/1982 | CA1119982A1 Process for recovering and utilizing cellulose using sulfuric acid |
| 02/18/1982 | WO1982000483A1 Pulping of lignocellulose with aqueous alcohol and alkaline earth metal salt catalyst |
| 02/16/1982 | CA1118381A1 Nontoxic cellulose solvent and process for forming and utilizing the same |
| 02/16/1982 | CA1118160A1 Method of oxygen delignification of digested fibre pulp |
| 02/10/1982 | EP0045500A1 Method for pretreatment of cellulose materials |
| 02/09/1982 | CA1117940A1 1,2,3,4,4a,9a-hexahydro anthracene-9,10-dione, preparation thereof and use thereof for the delignification of lignocellulosic materials |
| 01/26/1982 | CA1116816A1 Process for producing pulp |
| 01/12/1982 | CA1115908A1 Process for manufacture of thermoformable panels |
| 01/06/1982 | EP0043342A1 A method for the delignification of wood and other ligno-cellulosic products |
| 12/22/1981 | US4307121 Process for preparing cellulose |
| 12/22/1981 | CA1114663A1 Process and apparatus for the continuous treatment of cellulosic materials |
| 12/10/1981 | WO1981003505A1 Method and system for selective alkaline defiberization and delignification |
| 12/09/1981 | EP0041401A1 Method and mixture for producing cellulosic pulps |
| 11/17/1981 | CA1112538A1 Silica based defoamer compositions having improved stability |
| 11/03/1981 | CA1111694A1 Process and apparatus for continuously digesting plant fiber material |
| 10/20/1981 | US4295929 Process for acid sulfite digestion of wood |
| 10/13/1981 | US4294654 Delignification and bleaching of lignocellulosic pulp via photo-oxygenation |
| 10/13/1981 | US4294653 Digestion, delignification, defibering |
| 10/13/1981 | CA1110413A1 Process for pulping lignocellulosic material |
| 10/13/1981 | CA1110412A1 Pulping with an alkaline liquor containing a cyclic keto compound and an amino compound |
| 10/06/1981 | CA1110018A1 Delignification and bleaching process and solution for lignocellulosic pulp with peroxide in the presence of metal additives |
| 09/23/1981 | EP0036055A2 Method for the protection of aqueous media against attack by micro-organisms |
| 09/01/1981 | CA1107917A2 Pulping process |
| 08/11/1981 | CA1106557A1 Process for production of pulp |
| 08/05/1981 | EP0032919A1 Accelerated pulping process. |
| 08/04/1981 | CA1106305A1 Process for obtaining xylan and fibrinous material from vegetable raw material containing xylan |
| 07/21/1981 | US4279694 Method for treating refined mechanical pulp and thermo mechanical pulp with ozone |
| 07/14/1981 | CA1104762A1 Pulping processes |
| 07/01/1981 | EP0031059A1 Dispersions of dinitroanthraquinones, process for their preparation and their utilization |
| 06/24/1981 | EP0030778A1 Process for the formation of refiner pulp |
| 06/23/1981 | US4274913 Process for producing alkali pulp |
| 06/23/1981 | CA1103412A1 Kraft mill recycle process |
| 06/10/1981 | EP0030158A1 Apparatus and process for medium consistency oxygen delignification of pulp |
| 06/02/1981 | CA1102055A1 Modified system for recovery of sodium chloride from white liquor |
| 05/26/1981 | CA1101616A1 Method of producing coniferous wood celluloses by the sulphite process on a magnesium basis |
| 05/12/1981 | US4266981 Process for recovering and utilizing cellulose using sulfuric acid |
| 05/05/1981 | US4265675 Nontoxic cellulose solvent and process for forming and utilizing the same |
| 05/05/1981 | CA1100268A2 Continuous pulp digesting method and a digester with associated devices for applying the method |
| 05/05/1981 | CA1100267A2 Continuous pulp digesting method and a digester with associated devices for applying the method |
| 05/05/1981 | CA1100266A1 Organosolv delignification and saccharification process for lignocellulosic plant materials |
| 04/22/1981 | EP0027213A1 Process for the production of cellulose by using dispersions of nitroanthraquinones |
| 04/14/1981 | CA1099058A1 Process for controlling the supply of delignifying and/or bleaching chemicals in the continuous delignification of lignocellulosic material |
| 03/31/1981 | US4259148 Wetting surfaces of wood particles with solution of sulfite followed by heating with steam |
| 03/31/1981 | US4259147 Pulping process |
| 03/17/1981 | CA1097463A1 Pulping processes |
| 03/03/1981 | CA1096560A1 Process for the pulping of lignocellulosic material with alkali and quinones or hydroquinones |
| 03/03/1981 | CA1096559A1 Process for pretreating particulate lignocellulosic material |
| 02/24/1981 | CA1217765B Method of rendering lignin separable from cellulose and hemicellulose in lignocellulosic material and the product so produced |
| 02/24/1981 | CA1096374A1 Method of rendering lignin separable from cellulose and hemicellulose in lignocellulosic material and the product so produced |
| 02/24/1981 | CA1096112A1 Delignification of lignocellulosic material with an alkaline liquor in the presence of a diels alder adduct of benzoquinone or naphthoquinone |
| 02/24/1981 | CA1096111A1 Delignification of lignocellulosic material with a soda pulping liquor containing a diels alder adduct of naphthoquinone in admixture with a nitro aromatic compound |
| 02/17/1981 | CA1095663A1 Pulping process |
| 02/05/1981 | WO1981000267A1 Accelerated pulping process |
| 02/03/1981 | US4248663 Pulping with an alkaline liquor containing a cyclic keto compound and an amino compound |
| 02/03/1981 | US4248662 Delignification of wood using sodium tetraborate |
| 02/03/1981 | CA1094761A1 Cyclone separation in digester discharge |
| 02/03/1981 | CA1094760A1 Method and apparatus for control of gaseous and volatile combustibles in an oxygen reactor |
| 01/28/1981 | EP0022881A1 Accelerated pulping process |
| 01/27/1981 | US4247362 High yield fiber sheets |
| 01/27/1981 | CA1094264A1 Delignification of lignocellulosic material with a soda liquor containing a cyclic keto compound and a nitro aromatic compound |
| 01/27/1981 | CA1094263A1 Method of producing ultra high yield pulp |
| 01/07/1981 | EP0021264A1 Process for the delignification of lignocellulosic materials |
| 01/07/1981 | EP0021263A2 Process for producing cellulose by use of an agent comprising organic, cyclic compounds having keto and/or hydroxy groups |
| 12/30/1980 | US4242177 Method for oxidizing malodorous sulfur compounds in kraft cooking liquor |
| 12/23/1980 | CA1091869A1 Method for making chemicals to be added into a process of pulp making in which process soluble base is used |
| 12/16/1980 | US4239590 Method of maintaining uniformity of fibrous material fed to a continuous digester |
| 12/09/1980 | CA1091072A1 Method for treating refined mechanical pulp and thermo mechanical pulp with ozone |
| 12/02/1980 | US4236961 Pulping lignocellulose in continuous pressurized batch digesters |
| 11/27/1980 | WO1980002574A1 Pulping liquor reutilization |
| 11/25/1980 | US4235666 1,2,3,4,4a,9a-Hexahydro-9,10-anthracene-dione, its preparation and its application to the delignification of lignocellulosic materials |
| 11/11/1980 | CA1089161A2 Bleached kraft pulp mill operation |
| 10/28/1980 | CA1088261A1 Process for the delignification of a cellulose- containing material with an oxidizing gas in an aklaline milieu |
| 10/28/1980 | CA1088260A1 Process for manufacturing a semifinished product from ground vegetable raw material |
| 10/21/1980 | US4229251 High-yield semi-chemical carbonate pulping process |
| 10/21/1980 | CA1087892A1 Alkaline pulping process |
| 10/21/1980 | CA1087811A1 High yield, low cost cellulosic pulp |
| 10/15/1980 | EP0017544A1 Process for preparing a paper pulp |
| 10/14/1980 | CA1087355A1 Preparation of liquor for delignification or alkali treatment by autocaustisation and the preparation of pulp with this liquor |
| 10/14/1980 | CA1087354A1 Process for alkali cooking and delignifying cellulosic materials |
| 10/01/1980 | EP0016108A1 Process for attacking a cellulosic plant material by means of amino organic compounds |
| 08/19/1980 | US4218284 Process for the inhibition of the formation of deposits in cellulose pulping and cellulose pulp treating processes |
| 08/05/1980 | CA1082859A1 Pulping process using oxygen and sodium tetraborate |
| 07/29/1980 | US4214947 Delignification |
| 07/22/1980 | US4213821 Pulping with quinones and hydroquinones |
| 07/22/1980 | CA1081908A1 Method of improving the homogenity at periodical digestion of ligno-cellulose containing material |
| 07/09/1980 | EP0012960A1 Process and apparatus for the continuous cooking of fibrous plant material |
| 07/09/1980 | EP0012775A1 Process for pulping ligno-cellulosic material |
| 07/08/1980 | US4211605 Treatment with fulfur dioxide, sulfonation, difibering |
| 07/08/1980 | CA1081100A1 On-line analyzer |
| 07/08/1980 | CA1080914A1 Pulping of hardwood with sodium sulfide and sodium hydroxide while generating hydrogen sulfide in situ in the initial pulping stages |
| 07/08/1980 | CA1080913A1 Two-stage oxygen pulping |
| 07/08/1980 | CA1080911A1 Process for making high-strength, high-yield sulfite-modified thermomechanical pulp and a linerboard composition produced therefrom |
| 07/08/1980 | CA1080910A1 Process for controlling the intrinsic viscosity of sulfite pulp |
| 07/01/1980 | CA1080408A1 Oxidation of pulping liquor |
| 06/24/1980 | CA1079906A1 Process for producing pulp in the presence of a quinone compound |
| 06/10/1980 | CA1079009A1 Method of treating annual vascular plants containing holocellulose and lignin |