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)
11/1997
11/04/1997	CA2121969C Pre-treatment of sulfite pulp before bleaching with oxygen containing chemicals
10/1997
10/07/1997	CA2165347C 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
10/01/1997	EP0797702A1 High efficiency vessels for bleaching lignocellulosic, cellulosic and synthetic polymeric fibrous materials
09/1997
09/12/1997	WO1997033036A1 Magnetic deinking of waste papers
09/12/1997	CA2248131A1 Magnetic deinking of waste papers
07/1997
07/30/1997	EP0786029A1 Method for removal of hexenuronic acid groups in cellulose pulp by heat treatment
07/26/1997	CA2195993A1 Procedure for the burning of black liquor in a recovery boiler
07/23/1997	EP0784721A1 A method for treating acid and alkaline waste streams from a bleach plant separately
06/1997
06/03/1997	CA2098661C Method of bleaching paper pulp
05/1997
05/17/1997	CA2190573A1 Method and apparatus for delignifying chemical pulp
05/01/1997	WO1997015713A1 Acid treatment of pulp at high temperature in connection with bleaching
04/1997
04/20/1997	CA2186204A1 Bleaching of pulp
04/15/1997	CA2032315C Process for bleaching of chemical cellulose pulp
04/15/1997	CA2028788C Process for the chlorine-free bleaching of cellulosic materials
01/1997
01/28/1997	US5597446 Feeding wood chips to a pulping digester, electric motor moves rotor shaft in response to signal from controller
01/07/1997	US5591304 Delignifying brownstock with hemicellulases
12/1996
12/27/1996	EP0670928B1 Process for delignification of lignocellulose-containing pulp
12/22/1996	CA2179700A1 Method and apparatus for treating pulp
11/1996
11/06/1996	CA2170553A1 Treatment of filtrates in peroxide bleaching of pulp
11/05/1996	US5571378 Removing transition metals from kraft pulp
10/1996
10/08/1996	US5562803 Sequential bleaching of de-inked paper pulp with sodium bisulfite, dithionite and borohydride
09/1996
09/18/1996	CA2171595A1 Use of acid-stage filtrate in cooking liquor preparation
08/1996
08/27/1996	CA2069436C Pulp bleaching reactor and method
07/1996
07/31/1996	EP0545958B1 A process for hydrolyzing hemicellulose by enzymes produced by trichoderma reesei
06/1996
06/26/1996	CN1125430A 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
06/18/1996	US5527426 Magnetic deinking of waste papers
06/18/1996	CA2079000C Method for the use of enzymes in processing and bleaching of paper pulp, and apparatus for use thereof
05/1996
05/28/1996	US5520783 Apparatus for bleaching high consistency pulp with ozone
05/08/1996	EP0710214A1 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
04/1996
04/25/1996	WO1996012063A1 Method for removal of hexenuronic acid groups in cellulose pulp by heat treatment
04/18/1996	CA2201117A1 A process for treatment of effluents from a pulp producing plant
02/1996
02/14/1996	EP0487557B1 Improvement of pulp bleaching
01/1996
01/25/1996	WO1996001921A1 High efficiency vessels for bleaching lignocellulosic, cellulosic and synthetic polymeric fibrous materials
01/25/1996	CA2194882A1 High efficiency vessels for bleaching lignocellulosic, cellulosic and synthetic polymeric fibrous materials
01/02/1996	CA1337843C Process for oxygen bleaching
12/1995
12/20/1995	EP0687321A1 Method of bleaching pulp with chlorine-free chemicals
12/06/1995	EP0627029A4 Pulp bleaching apparatus and method.
12/05/1995	US5472572 Reactor for bleaching high consistency pulp with ozone
11/1995
11/28/1995	CA2023904C Deinking and bleaching secondary fiber
09/1995
09/17/1995	CA2144825A1 Method of bleaching cellulose pulp
09/17/1995	CA2144677A1 Method of tcf or ecf bleaching of cellulose pulp
09/13/1995	EP0670928A1 Process for delignification of lignocellulose-containing pulp.
08/1995
08/30/1995	EP0519061B1 Split alkali addition for high consistency oxygen delignification
05/1995
05/24/1995	CA2135742A1 Process for high-ph metal ion chelation in pulps
05/10/1995	EP0483163B1 Environmentally improved process for bleaching lignocellulosic materials
03/1995
03/16/1995	CA2132057A1 Pressurized peroxide bleaching
02/1995
02/22/1995	EP0482045B1 Process for processing waste paper
01/1995
01/05/1995	WO1995000439A1 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
12/1994
12/28/1994	EP0483164B1 A ground fault circuit interrupter
12/07/1994	EP0627029A1 Pulp bleaching apparatus and method
09/1994
09/15/1994	WO1994020673A1 Method of bleaching pulp with chlorine-free chemicals
09/13/1994	US5346588 Process for the chlorine-free bleaching of cellulosic materials with ozone
07/1994
07/27/1994	EP0607243A1 Method for enzymatic treatment of lignocellulosic materials, in particular cellulose pulps
06/1994
06/22/1994	CA2111921A1 Formulated composition of pulp digesting assistant agent
06/09/1994	WO1994012721A1 Process for delignification of lignocellulose-containing pulp
05/1994
05/28/1994	CA2109749A1 Method of controlling biotechnological pulp and paper processing using noble gases
03/1994
03/16/1994	EP0587270A1 Method of bleaching paper pulp
12/1993
12/11/1993	CA2098062A1 Production of cellulose pulp bleaching chemicals
12/07/1993	CA1324865C Method for recovering chemicals from spent pulp liquors
11/1993
11/18/1993	EP0569526A1 Pulping of lignocellulosic materials and recovery of resultant by-products
11/03/1993	CN1078006A Pulp bleaching reactor and method
07/1993
07/22/1993	WO1993014260A1 Pulp bleaching apparatus and method
06/1993
06/22/1993	US5221433 Deinking wastepaper using alkoxylation product of carboxylic acid containing an oh group and alkylene oxide
06/16/1993	EP0545958A1 A process for hydrolyzing hemicellulose by enzymes produced by trichoderma reesei.
06/09/1993	EP0483164A4 A ground fault circuit interrupter
04/1993
04/15/1993	WO1993007332A1 Method for enzymatic treatment of lignocellulosic materials, in particular cellulose pulps
04/15/1993	CA2120949A1 Method for enzymatic treatment of lignocellulosic materials, in particular cellulose pulps
04/05/1993	CA2079730A1 Process for improving delignification selectivity of a chemical papermaking pulp
03/1993
03/03/1993	EP0327576B1 Process for producing cellulose from lignin-containing raw materials
02/1993
02/24/1993	CN1069304A Environmentally improved process for bleaching lignocellnlosic materials
01/1993
01/26/1993	US5181989 Reactor for bleaching high consistency pulp with ozone
12/1992
12/22/1992	US5173153 Process for enhanced oxygen delignification using high consistency and a split alkali addition
12/22/1992	CA1311717C Effluent treatment
11/1992
11/11/1992	EP0512098A1 Pulp bleaching method and reactor
11/03/1992	CA1309610C Apparatus for treating fibre material containing liquid
09/1992
09/02/1992	EP0231275B1 Use of ligninolytic enzymes in paper pulp production
08/1992
08/29/1992	CA2061940A1 Aluminum hydroxychloride as pitch control agent
08/05/1992	EP0483163A4 Environmentally improved process for bleaching lignocellulosic materials
08/02/1992	WO1992013849A1 Pulping of lignocellulosic materials and recovery of resultant by-products
08/02/1992	CA2101754A1 Pulping of lignocellulosic materials and recovery of resultant by-products
07/1992
07/04/1992	WO1992012288A1 Split alkali addition for high consistency oxygen delignification
07/04/1992	CA2077433A1 Split alkali addition for high consistency oxygen delignification
06/1992
06/03/1992	EP0487557A1 Improvement of oxygen bleaching of pulp.
05/1992
05/12/1992	CA1300320C Pulp bleaching
05/06/1992	EP0483164A1 A ground fault circuit interrupter.
05/06/1992	EP0483163A1 Environmentally improved process for bleaching lignocellulosic materials.
04/1992
04/29/1992	EP0482045A1 Process for processing waste paper.
04/27/1992	WO1992007999A1 Pulp bleaching reactor and method
03/1992
03/25/1992	EP0308419B1 An apparatus for treating fibre material containing liquid
03/05/1992	WO1992003541A1 A process for hydrolyzing hemicellulose by enzymes produced by trichoderma reesei
02/1992
02/11/1992	CA1295440C Process for bleaching
01/1992
01/21/1992	CA1294396C Process for decreasing the charge of chemical required in a bleaching extraction stage
12/1991
12/24/1991	CA1293403C2 Pressure pulp washer
12/24/1991	CA1293402C Pressure pulp washer
11/1991
11/18/1991	WO1991018438A1 A ground fault circuit interrupter
11/18/1991	WO1991018145A1 Environmentally improved process for bleaching lignocellulosic materials
10/1991
10/02/1991	EP0319563B1 Process for bleaching of materials with a dithionite solution
09/1991
09/24/1991	CA1289398C Dewatering press
09/24/1991	CA1289305C Production of high strength linerboard with oxygen and alkali
09/04/1991	EP0305394B1 Arrangement for liquid treatment of pulp

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