| Patents for D21C 7 - Digesters (1,988) |
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| 10/27/1990 | CA2015538A1 Process and device for continuous cooking of cellulose |
| 09/04/1990 | US4954219 Displacement |
| 07/31/1990 | US4944841 Procedure for controlling alkaline pulping processes |
| 07/31/1990 | US4944840 Method and apparatus for evaporating waste liquor produced when cooking fibrous material containing cellulose |
| 07/10/1990 | CA1271353A1 Enclosed shoe press |
| 06/06/1990 | CA2002857A1 Cold blow system for batch production of pulp |
| 05/29/1990 | CA1269502A1 Mixing oxygen gas with medium consistency pulp in a pump discharge |
| 05/22/1990 | US4927312 Chip gates with air lock |
| 05/08/1990 | CA1268605A1 Method of controlling alkaline pulping by means of a rapid analyzer measuring organic and inorganic cooking liquor components |
| 03/13/1990 | US4908101 Fixed rotatable horizontal casing with pulp flow channel with guides for shearing pulp |
| 02/22/1990 | DE3927183A1 Controlling alkali digestion of cellulosic material - by determining volatile acid concn. ratio in liquor |
| 01/17/1990 | CN1038850A Sealing device for the end of axle of rotary spherical digester |
| 12/26/1989 | US4889593 Eluting through cation exchange resin; measuring uv absorption |
| 12/12/1989 | US4886577 Method and apparatus for mixing oxygen gas with medium consistency pulp in a pump discharge |
| 12/12/1989 | US4886576 Method and apparatus for producing uniform pulp yields by controlling the operation of a refiner |
| 12/06/1989 | EP0344462A1 Continuous cooking pulp quality enhancements |
| 10/11/1989 | EP0336234A2 Apparatus for continually sampling liquor from a pulp digester |
| 09/19/1989 | US4867846 Apparatus for feeding wood chips to a treatment bin |
| 08/23/1989 | CN2043248U Rotary spherical digester multiple-tubed revolving inlet head |
| 08/16/1989 | EP0327576A1 Process for producing cellulose from lignin-containing raw materials. |
| 08/01/1989 | US4853082 Process for the activation and delignification of cellulose pulp |
| 07/27/1989 | DE3901662A1 Process for monitoring the dissolution of lignin during alkaline decomposition |
| 06/27/1989 | US4842689 Method for controlling sulphite pulping and hydrolytic processes by means of rapid furfural analyzer |
| 06/06/1989 | US4836893 Apparatus for treatment of fiber material |
| 06/06/1989 | CA1255057A1 Method of controlling sulphite pulping and hydrolytic processes by means of a rapid furfural analyzer |
| 05/03/1989 | EP0313730A1 Apparatus and methods for reducing the formation of scale in pulping operations |
| 05/03/1989 | CN2036963U Sealing device at end of axle head of rotary spherical digester |
| 04/26/1989 | CN2036543U Stock bin with mobile bottom |
| 04/25/1989 | CA1253061A1 Method of determining rapidly the concentration of the total sulphur dioxide and the lignosulphonate present in sulphite pulping process liquors |
| 03/21/1989 | US4814042 Method for discharging delignified cellulosic materials from digesters |
| 02/28/1989 | CA1250480A1 Method and device in connection with continuous pulp cooking |
| 02/08/1989 | EP0302110A1 Process for production of cellulose pulp and/or delignification of secondary fibers |
| 11/02/1988 | CN87102890A Cooker/beater device |
| 10/25/1988 | US4780181 Multizonal-washing, conditioning, cooking |
| 10/05/1988 | CN87103255B Feeding equipment for continuous digestor |
| 10/04/1988 | CA1242552A1 Method of bringing a digester up to cooking temperature |
| 09/20/1988 | CA1242055A1 Sawdust pumping, and processing |
| 09/13/1988 | CA1241859A1 Chip presteaming and air washing |
| 09/07/1988 | CN88100825A Continuously-producing method for cellulose pulp and/or method for removing lignin from second fibre and method of classifying fibre |
| 08/25/1988 | WO1988006201A1 Process for production of cellulose pulp and/or delignification of secondary fibers |
| 08/16/1988 | US4764254 Falling film liquor heater having a screen to prevent clogging of a liquid distributing tray |
| 08/09/1988 | US4762591 Apparatus for reacting lignocellulosic material with a gas phase comprising a nitrogen oxide and oxygen under controlled gas pressure |
| 06/14/1988 | CA1237930A1 Continuous digester system |
| 05/24/1988 | US4746400 Method of treating cellulosic chips in a vessel with a false bottom |
| 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 |
| 04/27/1988 | EP0139633B1 Reactor to perform chemical reactions with dimensional reduction of solid materials |
| 03/16/1988 | EP0260249A1 High-pressure vessel with a compression device |
| 02/16/1988 | CA1232785A1 Apparatus for treating lignocellulosic material with a gas phase |
| 12/09/1987 | EP0087412B1 Method and apparatus for mixing pulp with gases |
| 12/08/1987 | CA1230002A1 Apparatus for treating cellulosic material |
| 11/19/1987 | EP0245238A1 Method for the separation of gases from the cooking liquor of cellulosic pulp |
| 11/04/1987 | CN87103255A Feeding equipment for continuous digestor |
| 09/15/1987 | US4693785 Digester having plural screens and means for controlling the liquid withdrawal |
| 09/01/1987 | US4690731 Delignification, lignocellulose, digestion, sulfite liquors, black liquor, multistage |
| 06/24/1987 | EP0226227A2 Chip presteaming and air washing |
| 06/16/1987 | US4673461 Enclosed shoe press with flexible end connections for its annular belt |
| 06/16/1987 | EP0225638A1 A method for delignification of pulp |
| 06/16/1987 | CA1222898A1 Process for continuous digestion of finely-divided material |
| 06/03/1987 | EP0224428A1 Enclosed shoe press |
| 06/03/1987 | CN86107639A Enclosed shoe press |
| 05/26/1987 | CA1222156A1 Reactor to perform chemical reactions with dimensional reduction of solid materials |
| 05/07/1987 | WO1987002721A1 Method for the separation of gases from the cooking liquor of cellulosic pulp |
| 03/24/1987 | CA1219493A1 Apparatus for pumping of pulp |
| 01/20/1987 | US4637878 Reciprocal movable screens in a vertically elongated vessel |
| 12/30/1986 | US4632729 Efficiency; flashing prevention; paper pulps |
| 09/16/1986 | US4612088 Size reduction of solids in suspension; paper pulp |
| 09/09/1986 | CA1210907A1 Method for use in continuous digestion of finely divided cellulose-containing material |
| 08/26/1986 | US4608121 Energy-efficient |
| 07/22/1986 | US4601787 Method of bringing a digester up to cooking temperature |
| 07/15/1986 | CA1207554A1 Method and apparatus for determining the properties of cellulose pulp |
| 07/01/1986 | US4597832 Apparatus for converting biomass to a pumpable slurry |
| 05/07/1986 | CN85203760U Sampler of pulp distillation temperature in evaporating globe |
| 04/15/1986 | CA1203055A1 Method of making sulphate pulp |
| 04/10/1986 | CN85106049A Power saving pulp beater |
| 02/18/1986 | US4571282 Process and apparatus for batch digester fluid heat reclamation |
| 02/04/1986 | US4568419 Continuous degestion to optimize uniformity |
| 12/03/1985 | US4556452 Compactor and heater for digestion |
| 11/21/1985 | EP0161330A1 Chip presteaming and air washing |
| 10/15/1985 | US4547264 Method of withdrawing liquid from a pair of vertically spaced annular screens |
| 10/15/1985 | US4547263 Method for obtaining useful products from green pseudostem, including papermaking pulp plantain |
| 10/09/1985 | EP0157279A1 Sawdust pumping, and processing |
| 09/24/1985 | CA1193807A1 Method and apparatus for controlled addition of alkaline chemicals to an oxygen delignification reaction |
| 09/11/1985 | EP0153977A1 Continuous digester system |
| 07/30/1985 | US4531892 Apparatus for pumping of pulp |
| 06/18/1985 | CA1189005A1 Acid hydrolysis, caustic extraction, material treatment |
| 06/10/1985 | EP0087412A4 Method and apparatus for mixing pulp with gases. |
| 05/08/1985 | EP0139633A1 Reactor to perform chemical reactions with dimensional reduction of solid materials. |
| 03/28/1985 | WO1985001305A1 Method for filling a batch digester |
| 01/15/1985 | CA1180927A1 Process and apparatus for producing pulp |
| 01/01/1985 | US4491504 Apparatus for treating cellulosic material with a screw feeder extending internally within a treatment vessel |
| 10/23/1984 | CA1176408A1 Process for the oxygen delignification of pulp |
| 09/27/1984 | WO1984003724A1 Reactor to perform chemical reactions with dimensional reduction of solid materials |
| 08/08/1984 | EP0114987A2 Apparatus for treating cellulosic material |
| 07/31/1984 | US4462740 Rotary charger |
| 05/29/1984 | US4451331 Liquor impregnation, compaction, heating and digestion |
| 05/15/1984 | CA1167205A1 Apparatus and method for medium consistency oxygen delignification of pulp |
| 03/13/1984 | US4436586 Method of producing kraft pulp using an acid prehydrolysis and pre-extraction |
| 02/21/1984 | US4432836 Vessel false bottoming |
| 02/14/1984 | US4431480 Method and apparatus for controlled addition of alkaline chemicals to an oxygen delignification reaction |