Patents
Sitemap › D21 - Paper-making; Production of cellulose › D21C - Production of cellulose by removing non-cellulose substances from cellulose- containing materials; Regeneration of pulping liquors; Apparatus therefor › D21C 7 - Digesters
Patents for D21C 7 - Digesters (1,988)
06/1993
06/09/1993EP0545888A1 Variable stage pressure diffuser
06/02/1993CN2135013Y Jet discharging device
06/01/1993US5216483 Fluorescence analyzer for lignin
05/1993
05/13/1993WO1993009391A1 Heating arrangement
05/13/1993CA2120722A1 Heating arrangement
05/11/1993US5209822 Undigested wood chips, papermaking
04/1993
04/29/1993WO1993008518A1 Method and apparatus for controlling liquid level in a knot drainer
04/20/1993US5203963 Producing paper pulp; steaming, impregnating with sulfur liquor, pressurizing, cooking cellulosic fibers
04/01/1993WO1993006296A1 Reaction tank
03/1993
03/24/1993CA2078183A1 Fluorescence analyzer for lignin
03/16/1993US5194388 "Kappa" number calibration standard
03/16/1993CA1314447C Apparatus for cleaning air ports of a chemical recovery furnace
03/10/1993CA2077838A1 Utilization of a paper pulp digester as a structural support
03/03/1993EP0327576B1 Process for producing cellulose from lignin-containing raw materials
02/1993
02/24/1993EP0527900A1 Liquid composition analyzer and method
02/17/1993EP0527323A1 Screw feeder
02/04/1993WO1993001875A1 Method and apparatus for separating gas from a gaseous material
01/1993
01/14/1993DE4221404A1 Controller for operating combustion plant for pulp digester waste liquor - to maximise recovery of sulphur di:oxide and active magnesia from bi:sulphite process, includes ash analyser, and combustion air regulator
01/07/1993EP0521443A1 Combustion plant for the spent liquor of a pulp digester with a control device for the drop size of the sprayed liquor
12/1992
12/30/1992CN1067462A Ammonium sulfite process for production of cotton pulp
12/22/1992US5172867 Utilization of a paper pulp digester as a structural support
12/16/1992EP0518851A1 Reducing chips to fibres in continuous digesters to facilitate lignin extraction
12/16/1992CN1067080A Low-loss and energy-saving recovery and steam-boiling technology for chemically making non-wooden pulp
12/09/1992EP0517689A1 Multi-level sulfide content
12/01/1992US5167769 Particle level sensor
11/1992
11/10/1992CA1309962C Plug screw feeder
11/10/1992CA1309889C Apparatus for chemical treatment of lignocellulosic materials
10/1992
10/21/1992EP0509981A1 Two stage pressure diffuser
09/1992
09/30/1992CN1018465B Recovery apparatus by digesting waste gas to extract and separate raw black liquid
09/16/1992EP0502852A1 Displacement heating in continuous digesters.
09/15/1992CA1307416C Method and apparatus for mixing chemicals into fiber pulp
09/02/1992CN1064117A Method for feeding continuous cookers under pressure for obtaining cellulose pulp
09/01/1992CA1306940C Falling film liquor heater
08/1992
08/19/1992CN1063732A Paper making method by all stem pulp making
07/1992
07/29/1992EP0495884A1 Method for discharging a digester
07/29/1992CN2111307U Atmospheric recovering device for papermaking boil down waste heat
07/29/1992CN1017636B Enclosed shoe press
07/22/1992CN1062939A Method for making artificial fibre pulp and xylitol using corn stalk as material
07/08/1992EP0493422A1 Improved plug screw feeder.
07/01/1992EP0492364A1 Control system to monitor the production of pulp in a discontinuous digester
06/1992
06/18/1992WO1992011409A1 Method for supplying pressurized continuous digesters to obtain cellulose pulp
06/18/1992CA2098493A1 Method for supplying pressurized continuous digesters to obtain cellulose pulp
06/16/1992CA1303401C Method and apparatus for producing uniform pulp yields
06/10/1992CN2106849U Automatic alkali distributor for paper-making
05/1992
05/26/1992US5116475 Method for discharging a digester
05/26/1992CA1301516C Method for discharging delignified cellulosic materials from digesters
05/20/1992CN1061253A Ammonium sulfite and calcium hydroxide pulping method
05/19/1992US5114540 Apparatus for chemical treatment of lignocellulosic materials
04/1992
04/28/1992CA1299322C Apparatus and methods for reducing the formation of scale in pulping operations
03/1992
03/25/1992EP0477059A2 Impregnation with black liquor prior to white liquor introduction
03/25/1992EP0476230A2 Extended kraft cooking with white liquor added to wash circulation
03/18/1992EP0475669A2 A mass tower and apparatus for the discharge thereof
03/18/1992CA2025522A1 Explosion pulping
03/04/1992EP0472820A2 Continuous solvent pulping and washing processes and apparatus
03/03/1992US5093773 Processing system with heat recovery
02/1992
02/26/1992CN1015653B Auto-controlling method and means for intermittent pulp proportioning and steaming
02/19/1992EP0471154A2 Sulfite modified continuous digesting
02/18/1992US5089086 Process for continuous cooking of cellulose
02/18/1992CA2042885A1 Continuous solvent pulping and washing processes and apparatus
02/18/1992CA2030090A1 Sulfite modified continuous digesting
02/11/1992US5087326 Rotating pulp bleaching reactor having inner and outer shells and lifting means on the interior surface of the inner shell
02/05/1992EP0469392A1 Apparatus for discontinuously extracting a cellulosic sample out of a digester
01/1992
01/14/1992US5080757 Method to displace a digester from both ends
12/1991
12/25/1991CN1057305A Liquid composition analyzer and method
12/03/1991US5069752 Minimization of variations in high pressure steam flow in pape rmaking
11/1991
11/19/1991US5066362 Extended delignification in pressure diffusers
11/06/1991EP0455525A1 Digester screen switching
11/02/1991WO1991017305A1 Liquid composition analyzer and method
11/02/1991CA2081907A1 Liquid composition analyzer and method
10/1991
10/31/1991CA2041275A1 Digester screen switching
10/23/1991CN2087205U Jet current throw-back device
10/22/1991US5060132 Method of modeling and control for delignification of pulping
10/22/1991US5059284 Apparatus to displace a digester from both ends
10/22/1991US5059281 Process and mechanism to empty pulping digester
10/02/1991EP0448920A1 Processing system with heat recovery
10/01/1991US5053108 High sulfidity cook for paper pulp using black liquor sulfonization of steamed chips
09/1991
09/04/1991CN1054280A Recovery apparatus by digesting waste gas to extract and separate raw black liquid
07/1991
07/24/1991CN2081397U Machinery level determining device of fibre separating device container
07/23/1991US5034095 Feeding cellulose containing alkali and oxygen, slurrying, discharging
07/16/1991US5032977 System for modeling and control for delignification of pulping
07/16/1991US5032976 System for modeling and control for delignification of pulping
07/16/1991US5032223 Analyzing decomposition products
06/1991
06/04/1991US5021127 Extended delignification in pressure diffusers
05/1991
05/16/1991WO1991005103A3 Displacement heating in continuous digesters
05/15/1991CN1051404A Method and apparatus to displace digester from both ends
05/02/1991WO1991005907A1 Method for discharging a digester
05/01/1991WO1991006702A1 Method and apparatus to displace spent liquors in a digester
04/1991
04/13/1991CA2027408A1 Processing system with heat recovery
04/10/1991CN1050579A Displacement heating in continuous digesters
04/10/1991CN1050578A Process for mechanism to empty pulping digester
04/04/1991WO1991004371A1 Improved plug screw feeder
04/03/1991EP0420791A2 Process and mechanism to empty pulping digester
03/1991
03/29/1991WO1991005103A2 Displacement heating in continuous digesters
02/1991
02/27/1991CN2072094U Mobile hydraulic hay grabbing machine for paper mill
02/13/1991CN1049202A Automatic control method and device of wood pulp burden boil down
02/05/1991US4990219 Apparatus for controlling the degree of cooking in a digester
01/1991
01/09/1991EP0407371A2 Continuous cooking with reduced cost, horsepower and pulp degradation
01/09/1991EP0407370A2 High sulfidity cook for paper pulp using black liquor sulfonization of steamed chips
12/1990
12/18/1990US4978425 Monitoring and minimizing variations in the kappa number
12/04/1990US4975148 Cold blow system for batch production of pulp
1 ... 8 9 10 11 12 13 14 15 16 17 18 19 20