D21C - Production of cellulose by removing non-cellulose substances from cellulose- containing materials; Regeneration of pulping liquors; Apparatus therefor

More topics under "D21C - Production of cellulose by removing non-cellulose substances from cellulose- containing materials; Regeneration of pulping liquors; Apparatus therefor" (28,631)
D21C 1 - Pretreatment of the finely-divided materials before digesting (1,872)
D21C 11 - Regeneration of pulp liquors (4,054)
D21C 3 - Pulping cellulose-containing materials (5,020)
D21C 5 - Other processes for obtaining cellulose, e.g. cooking cotton linters (5,432)
D21C 7 - Digesters (1,988)
D21C 9 - After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters (10,265)

Patents for D21C - Production of cellulose by removing non-cellulose substances from cellulose- containing materials; Regeneration of pulping liquors; Apparatus therefor (486)
10/2005
10/27/2005	WO2005100681A1 Method and device for washing of lime mud
09/2005
09/20/2005	US6945487 Feeding apparatus for cellulosic material
09/01/2005	WO2005080678A1 Modifying cellulose fibres by using amphoteric cellulose derivative
08/2005
08/11/2005	WO2005056917A3 Method and apparatus for improving the causticizing process
07/2005
07/14/2005	WO2005064078A1 Feed of a mixture of chips and fluid from a low-pressure system to a high-pressure system
06/2005
06/30/2005	WO2005059242A1 Method and plant for handling a mixture of liquor and soap, and a plant for conversion of fibre material to pulp
06/30/2005	WO2005059241A1 Method for the acidification of pulp prior to ozone bleaching
06/23/2005	WO2005056919A1 A method and system for controlling the addition of oxygen gas and alkali during oxygen gas delignification
06/23/2005	WO2005056917A2 Method and apparatus for improving the causticizing process
05/2005
05/26/2005	US20050109370 Cleaning device, cleaning tool and method of using the cleaning device
03/2005
03/31/2005	US20050067121 conveying, mixing, leveling and flaking dewatered pulps to produce flakes for use in dryers
12/2004
12/07/2004	CA2160430C Method of treating cellulose pulps
11/2004
11/18/2004	US20040226670 Top separator for gas phase and hydraulic phase continuous digesters and method for converting digester
10/2004
10/21/2004	WO2004090225A1 Purification of alkaline washing liquid
09/2004
09/21/2004	CA2285714C Continuous digester with inverted top separator
09/16/2004	WO2004079086A1 An arrangement for adjusting rotor position in a roting sluice
06/2004
06/10/2004	US20040108085 Method for separating hemicelluloses from a biomass containing hemicelluloses and biomass and hemicelluloses obtained by said method
05/2004
05/05/2004	CN1494624A Method for separating hemicelluloses from biomass containing hemicellulose and biomass and hemicelluloses obtained by said method
03/2004
03/31/2004	CN1143913C Method for producing cotton pulp using lateral pipe continous steaming and bleaching process
02/2004
02/24/2004	US6695950 Using selected oxidation conditions to generate aldehyde using a nitroxyl radical mediated oxidation with a limited amount of oxidant
02/10/2004	CA2266987C Method and system for feeding comminuted fibrous material
12/2003
12/30/2003	CA2134730C Chlorine-free bleaching with short sequence and filtrate recirculation
12/03/2003	EP1366231A2 Method for separating hemicelluloses from a biomass containing hemicelluloses and biomass and hemicelluloses obtained by said method
07/2003
07/30/2003	EP0545958B2 A process for hydrolyzing hemicellulose by enzymes produced by trichoderma reesei
06/2003
06/10/2003	US6576084 Method of pretreating pulp with yield or strength-enhancing additive
05/2003
05/27/2003	US6569289 Cellulose slurry treating systems for adding AQ to a cellulose slurry in the substantial absence of alkali
05/13/2003	CA2088026C Apparatus and method of controlling a position of rotor in a high pressure feeder
04/2003
04/29/2003	US6553593 Plate diffuser for treating comminuted cellulosic fibrous material
04/29/2003	CA2282238C Pulping process
04/16/2003	EP0670928B2 Process for delignification of lignocellulose-containing pulp
03/2003
03/20/2003	WO2002075042A3 Method for separating hemicelluloses from a biomass containing hemicelluloses
11/2002
11/12/2002	CA2090493C Process for hydrolyzing hemicellulose by enzymes produced by trichoderma reesei
09/2002
09/26/2002	WO2002075042A2 Method for separating hemicelluloses from a biomass containing hemicelluloses
09/12/2002	DE10109502A1 Removal of hemicellulose from biomaterial, especially wood pulp, involves extraction by treatment with an aqueous solution of metal complex, e.g. nickel tris-2-aminoethyl-amine di-hydroxide
09/03/2002	CA2157109C Method of bleaching pulp with chlorine-free chemicals
08/2002
08/13/2002	CA2229973C Method of inhibiting scaling in black liquor evaporators
07/2002
07/25/2002	US20020095956 Plate diffuser for treating comminuted cellulosic fibrous material
07/16/2002	CA2189899C Cooking cellulose material using high alkali concentrations and/or high ph near the end of the cook
06/2002
06/12/2002	CN1086216C Method for burning siliceous spent liquor
06/12/2002	CN1086189C Ultra-fine microcrystalline cellulose compositions and process for their manufacture
06/05/2002	CN1352336A Method for producing cotton pulp big using lateral pipe continous steaming and bleaching process
04/2002
04/23/2002	US6375795 Minimization of malodorous gas release from a cellulose pulp mill feed system
04/23/2002	CA2048618C A method of de-inking waste paper materials
03/2002
03/07/2002	US20020026991 Impregnating the material with a solution containing yield or strength-enhancing additive so that no degradation or hydrolysis occurs; treating material with an alkaline cooking liquor produce a chemical cellulose pulp
02/2002
02/20/2002	EP1180172A1 Process for bleaching chemical pulps with low organic halogen compounds content
12/2001
12/12/2001	EP1161593A1 Oxygen delignification of pulp in the presence of carbonates as alkali
11/2001
11/21/2001	CN1075143C Method for removing hexenuronic acids cellulose pulp by heat treatment
11/11/2001	CA2345762A1 Feeding comminuted fibrous material
11/11/2001	CA2345759A1 Metal removal from comminuted fibrous material during feeding
10/2001
10/23/2001	US6306253 Acid treatment of pulp at high temperature prior to chlorine dioxide bleaching
09/2001
09/13/2001	US20010020521 Pulp digested and oxygen delignified in order to decrease Kappa number to less than 24, preferably less than 14, and after that treated in acid stage at pH of 2-5 and temperature of 75-130 degrees C to further reduce kappa number
09/04/2001	US6284095 Minimization of malodorous gas release from a cellulose pulp mill feed system
08/2001
08/29/2001	CN1070153C The use of dialdehydes and acetals inhibiting decomposition of peroxide in the production and treatment of recycled fiber pulp and other fiber pulp
08/14/2001	US6272710 Plate diffuser for treating comminuted cellulosic fibrous material
07/2001
07/19/2001	US20010008177 Minimization of malodorous gas release from a cellulose pulp mill feed system
07/18/2001	EP0856080B1 Acid treatment of pulp at high temperature in connection with bleaching
07/07/2001	CA2330409A1 Metal extraction prior to chelation in chemical pulp production
07/04/2001	EP0885325B1 Magnetic deinking of waste papers
07/04/2001	CN1302219A Pulp filter or washer and sealing for use therein
06/2001
06/21/2001	US20010004005 Acid treatment of pulp at high temperature prior ro chrlorine dioxide bleaching
06/13/2001	CN1298986A Aldehyde modified cellulose pulp for prepn. of high strength paper products
06/05/2001	CA2173191C Electrochemical process
02/2001
02/17/2001	CA2316111A1 Aldehyde modified cellulose pulp for the preparation of high strength paper products
01/2001
01/24/2001	EP1069934A1 Pulp filter or washer and sealing for use therein
01/10/2001	EP0710214B1 The use of dialdehydes and acetals thereof for inhibiting decomposition of peroxide in the production and the treatment of recycled fiber pulp and other fiber pulp
01/03/2001	CN1278830A Ultra-fine microcrystalline cellulose compositions and process for their manufacture
11/2000
11/28/2000	US6153052 Pulping process
11/02/2000	WO2000065148A1 Process for bleaching chemical pulps with low organic halogen compounds content
09/2000
09/26/2000	CA2064027C Ground fault circuit interrupter
09/19/2000	CA2149648C Process for delignification of lignocellulose-containing pulp
09/05/2000	CA2128241C Pulp bleaching apparatus and method
08/2000
08/17/2000	WO2000047813A1 Oxygen delignification of pulp in the presence of carbonates as alkali
08/04/2000	CA2297222A1 Minimization of malodorous gas release for a cellulose pulp mill feed system
07/2000
07/19/2000	CA2296289A1 Method and apparatus for separating soap
07/18/2000	US6090240 Method of inhibiting scaling in black liquor evaporators
06/2000
06/14/2000	EP0786029B1 Method for removal of hexenuronic acid groups in cellulose pulp by heat treatment
05/2000
05/18/2000	WO2000011259A3 Device for making cellulose
03/2000
03/02/2000	WO2000011259A2 Device for making cellulose
01/2000
01/05/2000	EP0627029B1 Pulp bleaching apparatus and method
12/1999
12/15/1999	CN1047418C Pulp bleaching reactor and its method
11/1999
11/16/1999	US5984987 Spraying black liquor into enclosed zone above surface of turbulent molten salt pool, drying with hot gases rising from surface of pool, dispersing resulting solid particles falling into pool, converting into combustible gas and reduced melt
11/07/1999	CA2271615A1 Plate diffuser for treating comminuted cellulosic fibrous material
11/07/1999	CA2271293A1 Plate diffuser for treating comminuted cellulosic fibrous material
10/1999
10/06/1999	CA2268338A1 Feeding of comminuted fibrous material to a pulping process
09/1999
09/16/1999	WO1999046025A1 Pulp filter or washer and sealing for use therein
09/16/1999	CA2323049A1 Pulp filter or washer and sealing for use therein
08/1999
08/19/1999	CA2258387A1 Removal of transition metal ions from wood pulp fibers
06/1999
06/23/1999	CN1043798C Environmentally improved process for bleaching lignocellnlosic materials
02/1999
02/17/1999	EP0687321B1 Method of bleaching pulp with chlorine-free chemicals
02/11/1999	CA2245273A1 Method for compacting and selective leaching of fly ash from a recovery boiler using a pressure filter
01/1999
01/26/1999	US5863389 Pulp bleaching reactor for dispersing high consistency pulp into a gaseous bleaching agent containing ozone
12/1998
12/23/1998	EP0885325A1 Magnetic deinking of waste papers
12/16/1998	EP0884415A1 Method of washing pulp in connection with bleaching
10/1998
10/07/1998	EP0869218A1 Magnetic removal of"stickies"from waste papers
08/1998
08/05/1998	EP0856080A1 Acid treatment of pulp at high temperature in connection with bleaching
07/1998
07/28/1998	US5785812 Process for treating oxygen delignified pulp using an organic peracid or salt, complexing agent and peroxide bleach sequence
05/1998
05/13/1998	CN1181437A Method for burning siliceous spent liquor
03/1998
03/17/1998	US5728263 Method for inhibiting enzymatic decomposition of peroxide in the treating of fiber pulp using dialdehydes and acetals
02/1998
02/03/1998	CA2063591C Environmentally improved process for bleaching lignocellulosic materials
12/1997
12/24/1997	CN1168706A Method for removal of hexenuronic acid groups in cellulose pulp by heat treatment

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