| Patents for D21C - Production of cellulose by removing non-cellulose substances from cellulose- containing materials; Regeneration of pulping liquors; Apparatus therefor (486) |
|---|
| 09/04/1991 | EP0301024B1 Dewatering press |
| 09/04/1991 | EP0301023B1 Apparatus for liquid treatment of pulp |
| 07/23/1991 | CA1286455C High yield chemical pulping |
| 07/12/1991 | CA2033855A1 Process for countercurrent washing and bleaching of a pulp from chemical pulping |
| 05/08/1991 | EP0426652A1 Process for the chlorine-free bleaching of pulp |
| 05/01/1991 | CN1051062A Deinking and bleaching secondary fiber |
| 03/07/1991 | WO1991002840A1 Improvement of oxygen bleaching of pulp |
| 01/15/1991 | WO1991001405A1 Process for processing waste paper |
| 01/15/1991 | CA2064201A1 Process for processing waste paper |
| 01/08/1991 | CA1278718C Apparatus for liquid treatment of pulp |
| 10/30/1990 | CA1275593C Arrangement for liquid treatment of pulp |
| 10/02/1990 | CA1274655A1 Process for the bleaching of ns-aq or sap pulp |
| 09/25/1990 | CA1274355A1 Gasification of black liquor |
| 06/13/1990 | EP0250422B1 Process for preparing bleached pulp from lignocellulosic raw material |
| 06/12/1990 | US4933801 Ground fault circuit interrupter |
| 05/15/1990 | CA1268906A1 Procedure for delignification of sulphate pulp |
| 05/08/1990 | CA1268605A1 Method of controlling alkaline pulping by means of a rapid analyzer measuring organic and inorganic cooking liquor components |
| 04/25/1990 | CA2001188A1 Multiple charge chlorine bleaching to reduce formation of chlorinated dioxins and furans |
| 04/24/1990 | US4919755 Dithionite solution of sodium borohydride, sodium hydroxide and a bisulfite solution |
| 02/13/1990 | US4900400 Arrangement for liquid treatment of pulp |
| 01/02/1990 | US4890550 Apparatus for treating fibre material containing liquid |
| 08/29/1989 | US4861433 Dewatering press with perforated metal outer shell and resilient elastic mounting means |
| 08/16/1989 | EP0327576A1 Process for producing cellulose from lignin-containing raw materials. |
| 06/14/1989 | EP0319563A1 Process for bleaching of materials with a dithionite solution. |
| 03/08/1989 | EP0305394A1 Arrangement for liquid treatment of pulp. |
| 02/28/1989 | US4808310 Apparatus for liquid treatment of pulp with vapor separation |
| 02/14/1989 | CA1249904A1 Oxygen alkali extraction of cellulosic pulp |
| 02/07/1989 | CA1249783A1 Use of ligninolytic enzymes |
| 02/01/1989 | EP0301024A1 Dewatering press. |
| 02/01/1989 | EP0301023A1 Apparatus for liquid treatment of pulp. |
| 01/04/1989 | CN1030107A Method for recovering chemicals from spent pulp liquors |
| 12/29/1988 | WO1988010334A1 Process for bleaching of materials with a dithionite solution |
| 08/17/1988 | EP0128190B1 Method of peroxide bleaching cellulose-containing material |
| 06/21/1988 | US4752363 Adding alkali metal hydroxide, filtration and electrolysis |
| 05/05/1988 | WO1988003190A1 Process for producing cellulose from lignin-containing raw materials |
| 05/05/1988 | DE3636208A1 Verfahren zur delignifizierung und bleichung von lignicellulosehaltigem bzw. ligninhaltigem material bzw. lignin durch enzymatische behandlung Process for the delignification and bleaching of lignocellulosic material or lignicellulosehaltigem or lignin by enzymatic treatment |
| 04/05/1988 | CA1234655A1 Method of peroxide bleaching cellulose-containing material |
| 03/29/1988 | US4734160 Method of two-stage peroxide bleaching of mechanical or semi-mechanical pulp |
| 01/07/1988 | EP0251691A2 Effluent treatment |
| 01/07/1988 | EP0250422A1 Process for preparing bleached pulp from lignocellulosic raw material. |
| 12/15/1987 | CA1230205A1 Process and apparatus for bleaching of pulp |
| 12/03/1987 | WO1987007314A1 Procedure for prebleaching chemical cellulose pulps |
| 11/19/1987 | WO1987006962A1 Arrangement for liquid treatment of pulp |
| 11/19/1987 | EP0245238A1 Method for the separation of gases from the cooking liquor of cellulosic pulp |
| 10/22/1987 | WO1987006282A1 Dewatering press |
| 10/22/1987 | WO1987006281A1 Apparatus for liquid treatment of pulp |
| 09/01/1987 | US4690895 Use of rLDM™ 1-6 and other ligninolytic enzymes in the bleaching of kraft pulp |
| 08/12/1987 | EP0231275A1 Use of ligninolytic enzymes in paper pulp production. |
| 06/09/1987 | CA1222604A1 Black liquor gasification process |
| 05/07/1987 | WO1987002721A1 Method for the separation of gases from the cooking liquor of cellulosic pulp |
| 03/31/1987 | CA1219707A1 Chlorine-based bleaching process for kraft pulps using non-alkaline or organic solvent extraction stages |
| 01/29/1987 | WO1987000564A1 USE OF rLDMTM 1-6 AND OTHER LIGNINOLYTIC ENZYMES |
| 09/25/1986 | WO1986005529A1 Process for preparing bleached pulp out of lignocellulosic raw material |
| 08/12/1986 | CA1209307A1 Process and alkaline sulfite-sulfide cooking liquor for the preparation of pulp out of lignin-containing cellulose raw-material |
| 06/10/1986 | CA1205930A1 Method for the purification of condensates from the sulfate process |
| 01/21/1986 | CA1199454A1 Recovery of heat and chemical values from spent pulping liquors |
| 09/24/1985 | CA1193808A1 Chemical pulp having improved strength, drainability and beatability, and a process of making said pulp |
| 08/20/1985 | CA1192009A1 Process for delignifying lignocellulosic material in the presence of phenazine compounds |
| 01/22/1985 | CA1181204A1 Method and system for reacting ozone with pulp |
| 12/19/1984 | EP0128190A1 Method of peroxide bleaching cellulose-containing material. |
| 09/04/1984 | CA1173604A1 Production of chemimechanical pulp |
| 06/21/1984 | WO1984002366A1 Method of peroxide bleaching cellulose-containing material |
| 01/17/1984 | CA1160403A1 Method of treating kraft black liquor |
| 12/20/1983 | CA1158904A1 Method and means for use in the manufacture of fibre pulp |
| 09/27/1983 | CA1154205A1 Brightness improvement of ozone bleached pulps |
| 07/05/1983 | CA1149254A1 Black liquor soap possessing improved deresinating ability |
| 07/05/1983 | CA1149111A1 Process for delignifying and/or bleaching cellulose pulp |
| 06/21/1983 | CA1148498A1 Electrochemical corrosion protection of stainless steel bleach plant washers |
| 07/13/1982 | CA1127358A1 Method of manufacturing sulphate pulp |
| 06/29/1982 | CA1126691A1 Monitor assembly for electrochemical corrosion protection of stainless steel bleach plant washers |
| 01/12/1982 | CA1115908A1 Process for manufacture of thermoformable panels |
| 09/01/1981 | CA1107941A1 Method of refining of fibre material |
| 06/23/1981 | CA1103409A1 Method of bleaching chemical pulp in multiple stages |
| 05/26/1981 | CA1101616A1 Method of producing coniferous wood celluloses by the sulphite process on a magnesium basis |
| 02/24/1981 | CA1096113A1 Fluidized bed recovery of sodium carbonate from spent cooking liquor |
| 02/17/1981 | CA1095765A1 Displacement bleaching temperature control |
| 11/04/1980 | CA1088957A1 Process for the purification of methanol obtained from kraft pulping condensates |
| 10/21/1980 | CA1087892A1 Alkaline pulping process |
| 06/03/1980 | CA1078559A1 Smelt spout for recovery boiler |
| 11/20/1979 | CA1066697A1 Method of producing cellulose |
| 08/28/1979 | CA1061059A1 Pulp mill recovery system |
| 06/19/1979 | CA1056558A1 Strenghtening of mechanical pulp by chemical treatment |
| 05/29/1979 | CA1055291A1 Method of treating ligno-cellulose containing material |
| 03/06/1979 | CA1049713A1 Recovering turpentine and heat from black liquor from a continuous digestor |
| 12/05/1978 | CA1043516A1 Method for producing oxidized white liquor |
| 10/11/1977 | US4053352 Method for producing oxidized white liquor |