| Patents for D21C 3 - Pulping cellulose-containing materials (5,020) |
|---|
| 06/10/1980 | CA1079008A1 Solvent pulping process |
| 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 |
| 04/29/1980 | CA1076306A1 Process for reducing the requirement of fresh chemicals without increasing emissions in the pulping of cellulose material with alkaline sodium- and sulfur-containing sulfate pulping liquor |
| 04/22/1980 | CA1075857A1 Chemical pretreatment of wood prior to making refiner groundwood |
| 04/15/1980 | CA1075409A1 Ammonia-ketone pulping process |
| 03/19/1980 | EP0008783A1 Method and means for decomposing vegetal materials |
| 03/11/1980 | US4192708 Method for controlling the addition of active chemical for delignifying and/or bleaching cellulose pulp suspended in a liquor containing chemicals reactive with the delignifying and/or bleaching chemical |
| 03/11/1980 | CA1073161A1 Delignification process |
| 02/26/1980 | CA1072262A1 Pulp mill process with sodium chloride removal |
| 02/19/1980 | CA1071805A1 Drainage and wet stretch improvement in mechanical pulps |
| 02/12/1980 | US4188261 Method of improving the homogeneity of lignocellulose containing material |
| 02/07/1980 | WO1980000159A1 Process for attacking a cellulosic plant material by means of amino organic compounds |
| 02/05/1980 | CA1070907A1 Process for manufacturing chemimechanical cellulose pulp in a high yield within the range from 65 to 95% |
| 01/29/1980 | CA1070537A1 Method fo feeding fibrous material into a pressurized vessel |
| 01/22/1980 | CA1070056A1 Process for oxygen alkali delignification of wood pulp |
| 01/09/1980 | EP0006790A1 1,2,3,4,4a,9a-Hexahydroanthracen-9,10-dion, its preparation and its application in the delignification of lignocellulosic material |
| 01/09/1980 | EP0006201A1 Agent usable for the production of cellulose and process for the production of cellulose |
| 01/08/1980 | US4182648 Oxygen pulping process |
| 01/08/1980 | CA1069363A1 Three vessel treatment system |
| 01/01/1980 | US4181796 Process for obtaining xylan and fibrin from vegetable raw material containing xylan |
| 01/01/1980 | US4181565 Process for cooking lignocellulosic material in the presence of hydroxyanthracenes and derivatives thereof |
| 12/18/1979 | US4178861 Method for the delignification of lignocellulosic material in an amine delignifying liquor containing a quinone or hydroquinone compound |
| 12/18/1979 | CA1068054A1 Method for controlling the addition of active chemical for delignifying and/or bleaching cellulose pulp suspended in a liquor containing chemicals reactive with the delignifying and/or bleaching chemical |
| 11/20/1979 | CA1066697A1 Method of producing cellulose |
| 11/06/1979 | CA1065560A1 Process for manufacturing improved high-yield pulps |
| 10/31/1979 | EP0004928A1 Dispersion to be used in the production of cellulose and process for producing cellulose using this dispersion |
| 10/16/1979 | CA1064206A1 Method of recovering substances in the extraction of spent liquors from the delignification of lignocellulosic material by means of chloride-producing bleaching agents |
| 10/16/1979 | CA1064205A1 Method and device for treatment of fiber material |
| 09/04/1979 | CA1061511A1 Method of treatment of wood pulp for greater efficiency in wood utilization |
| 08/28/1979 | CA1061058A1 Oxygen pulping |
| 08/21/1979 | US4165253 Process for producing pulp |
| 07/31/1979 | US4162933 Exothermic heat as a means of determining the degree of delignification |
| 07/24/1979 | US4162188 Process for producing pulp |
| 07/17/1979 | US4161395 Vacuum pumps |
| 07/10/1979 | CA1057909A1 Production of chlorine dioxide |
| 06/26/1979 | CA1057008A1 Method in sulphite pulping |
| 06/26/1979 | CA1057007A1 Impregnation of wood particles |
| 06/19/1979 | CA1056558A1 Strenghtening of mechanical pulp by chemical treatment |
| 06/05/1979 | CA1055755A1 Process and apparatus for the manufacture of pulp |
| 06/05/1979 | CA1055754A1 Method of liquid treating cellulose fibres and a device for carrying out the method |
| 05/29/1979 | CA1055291A1 Method of treating ligno-cellulose containing material |
| 05/22/1979 | US4155806 Method for continuous alkaline delignification of lignocellulose material in two or more steps, the final of which with oxygen |
| 05/22/1979 | CA1054757A1 Method and device for continuous treatment of fiber material |
| 05/08/1979 | CA1053860A2 Chlorine dioxide generation and pulp bleaching |
| 05/01/1979 | US4152197 Process for preparing high-yield cellulose pulps by vapor phase pulping an unpulped portion of lignocellulosic material and a partially chemically pulped portion |
| 04/05/1979 | WO1979000152A1 Silica based defoamer compositions having improved stability |
| 04/03/1979 | CA1051618A1 Method of producing high yield chemimechanical pulps |
| 03/27/1979 | US4146422 Method for obtaining any variation in the fiber content of a digester effluent slurry |
| 03/27/1979 | CA1051151A1 Apparatus and process for producing kraft type pulp |
| 03/22/1979 | WO1979000119A1 Process allowing the delignification and the transformation into sugar of lignocellulose vegetal materials by using organic solvents |
| 03/20/1979 | US4145246 Process for making high-strength, high-yield sulfite-modified thermomechanical pulp and a linerboard composition produced therefrom |
| 03/13/1979 | CA1050212A1 Method of increasing pulp yield and viscosity |
| 02/27/1979 | US4141787 Process for preparing chemical cellulose according to the sulfite process by increasing the total SO2 content of cooking acid with liquid SO2 and digesting wood chips |
| 01/30/1979 | CA1047209A1 Method and apparatus for treating cellulosic pulp with oxygen in alkali conditions and at raised pressure and temperature |
| 01/23/1979 | US4135967 Process for producing cellulose pulp by solid phase digestion |
| 01/16/1979 | US4134787 Delignification of lignocellulosic material with an alkaline liquor containing a cyclic amino compound |
| 01/09/1979 | US4133714 Reaction vessel with pulsating means for producing lignocellulose product from crushed vegetable raw materials |
| 12/19/1978 | US4130457 Method of pulping with polysulfide |
| 12/19/1978 | CA1044408A1 Method and device for obtaining fibrous materials |
| 12/12/1978 | CA1044060A1 Screenless digesting system and method |
| 12/05/1978 | CA1043516A1 Method for producing oxidized white liquor |
| 12/05/1978 | CA1043515A1 Method for controlling batch alkaline pulp digestion in combination with continuous alkaline oxygen delignification |
| 11/14/1978 | CA1042160A1 Alkali/oxygen gas digestion of wood |
| 11/14/1978 | CA1042159A1 High yield pulping process |
| 10/31/1978 | US4123383 Silica based defoamer compositions having improved stability |
| 10/31/1978 | US4123318 Impregnation, digestion, washing cellulsoe fiber |
| 10/10/1978 | CA1039908A1 Process for the delignification of lignocellulosic material |
| 10/03/1978 | US4118271 Milling, delignification, adding magnesium hydroxide, combustion, absorption, recirculation |
| 10/03/1978 | CA1039459A1 Method for improving heat economy in the batchwise digestion of lignocellulosic material |
| 09/26/1978 | US4116759 Preparation of liquor for delignification or alkali treatment by autocaustization, and the preparation of pulp with this liquor |
| 09/26/1978 | US4116758 Sulfonation of lignocellulose |
| 09/12/1978 | US4113553 Pulping hardwood to produce cellulose pulp of high quality, low requirement for causticized pulping liquor |
| 08/22/1978 | CA1036759A1 Method for the oxygen-gas delignification of lignocellulosic material and apparatus for carrying out the method |
| 08/22/1978 | CA1036758A1 Method of delignification of cellulosic material in alkaline medium using oxygen |
| 08/15/1978 | US4107073 Pulp and papermaking additive |
| 08/15/1978 | US4106979 Preparation of paper pulps from dicotyledonous plants |
| 08/15/1978 | CA1036304A1 Process for producing paper-making pulps from grasses |
| 07/11/1978 | US4100016 Solvent pulping process |
| 06/13/1978 | US4094735 Method of pulping with sulfite liquor containing formic acid esters |
| 05/16/1978 | US4089737 Delignification of cellulosic material with an alkaline aqueous medium containing oxygen dissolved therein |
| 05/09/1978 | US4088528 Method and apparatus for grinding chips into paper pulp |
| 05/02/1978 | US4087318 Oxygen-alkali delignification of lignocellulosic material in the presence of a manganese compound |
| 05/02/1978 | US4087317 Defiberizing lignocellulose |
| 05/02/1978 | US4087316 Using alkaline solution and oxygen containing gas |
| 04/25/1978 | US4086129 Process for controlling the intrinsic viscosity of sulfite pulp |
| 04/04/1978 | US4082233 Disc refiner having means for removing gaseous media from pulp stock |
| 03/28/1978 | US4081316 Method for producing fluffed pulp |
| 03/21/1978 | US4080248 Pulping lignocellulose |
| 02/28/1978 | US4076579 Pulping of lignocellulosic material by sequential treatment thereof with nitric oxide and oxygen |
| 02/14/1978 | US4073678 High yield semichemical wood pulping process |
| 01/24/1978 | US4070233 Delignifying |
| 01/10/1978 | US4067768 Alkaline pulping of lignocellulosic material with amine and sulfate pretreatment |
| 11/01/1977 | US4056429 Method for counter-current treatment of cellulose fiber material |
| 10/11/1977 | US4053352 Method for producing oxidized white liquor |
| 09/27/1977 | US4050981 Process for the delignification of lignocellulosic material by maintaining a concentration of carbon monoxide in the presence of oxygen and alkali |
| 08/30/1977 | US4045280 Ethanolamine or methylamine, copper or nickel nitrate |
| 08/30/1977 | US4045279 Precooking, defibrating, pulping, recycling waste liquor; sulfite- and sulfide-free process |
| 08/16/1977 | US4042328 On-line analyzer |
| 08/09/1977 | US4040899 Production of high strength packaging papers from straw |