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Class Information
Number: 162/19
Name: Paper making and fiber liberation > Processes of chemical liberation, recovery or purification of natural cellulose or fibrous material > Continuous chemical treatment or continuous charging or discharging > Plural diverse stage treatment
Description: Processes in which the fibrous material is subjected to a plurality of dissimilar chemical treatments.

Patents under this class:
1 2 3 4 5

Patent Number Title Of Patent Date Issued
8691049 Method for an energy efficient production of cellulose pulp in a continuous digester Apr. 8, 2014
8657960 Method and system for fractionation of lignocellulosic biomass Feb. 25, 2014
8647469 Method, system and withdrawal screen section for impregnating chips Feb. 11, 2014
8617354 Shaped cellulose manufacturing process combined with a pulp mill recovery system Dec. 31, 2013
8518213 Process for producing alcohol and other bioproducts from biomass extracts in a kraft pulp mill Aug. 27, 2013
8512512 System and method for preextraction of hemicellulose through using a continuous prehydrolysis and steam explosion pretreatment process Aug. 20, 2013
8500956 Process for producing a pulp Aug. 6, 2013
8449720 Method of making paper May. 28, 2013
8449717 Method for preventing clogging in a strainer construction for a continuous digester May. 28, 2013
8394235 Removal of inhibitory compounds during pre-treatment of lignocellulosic biomass Mar. 12, 2013
8328983 Modified kraft fibers Dec. 11, 2012
8317975 Product and processes from an integrated forest biorefinery Nov. 27, 2012
8273212 Method for kraft pulp production where hemicelluloses are returned Sep. 25, 2012
8262854 Method for recovering hydrolysis products Sep. 11, 2012
8197639 Vapour phase digester and a method for continuous cooking Jun. 12, 2012
8123864 Method and apparatus for conversion of cellulosic material to ethanol Feb. 28, 2012
8080128 Method for increasing the concentration of xylose in lignocellulosic hydrolysate Dec. 20, 2011
7998310 Method for impregnating chips Aug. 16, 2011
7988788 Process for rapid acid hydrolysis of lignocellulosic material and in a hydrolysis reactor Aug. 2, 2011
7976675 Continuous digester system Jul. 12, 2011
7871491 Method and arrangement for continuous cooking Jan. 18, 2011
7758721 Pulping process with high defiberization chip pretreatment Jul. 20, 2010
7758720 High defiberization pretreatment process for mechanical refining Jul. 20, 2010
7686919 Method and device for the continuous cooking of pulp Mar. 30, 2010
7615134 Method and arrangement of impregnating chips Nov. 10, 2009
7566380 Continuous digester with fluid circulation Jul. 28, 2009
7547374 Method for impregnating chips in a continuous digestion system Jun. 16, 2009
7540938 Method and system for energy savings in TMP by high temperature LC/MC refining of pulp Jun. 2, 2009
7501043 Steam treatment of chips with the addition of an acid liquid Mar. 10, 2009
7455749 Gas phase continuous digester having an inverted top separator with liquor injection Nov. 25, 2008
7445691 Impregnation of chips with an acid liquid prior to a sulphate pulping process Nov. 4, 2008
7402224 Method for producing paper pulp, lignins, sugars and acetic acid by frantionation of lignocellulosic vegetable material in formic/acetic acid medium Jul. 22, 2008
7381303 System and method for controlling a thermo-mechanical wood pulp refiner Jun. 3, 2008
7381302 Method and arrangement for impregnating chips Jun. 3, 2008
7374637 Method of bleaching cellulose pulp with a main conduit for wash liquor and filtrate May. 20, 2008
7351306 Cooking of cellulose pulp in a cooking liquor containing pre-evaporated black liquor Apr. 1, 2008
7351305 Method and a digester for the continuous cooking of wood raw material to cellulose pulp Apr. 1, 2008
7303649 Removal of inorganic elements from wood chips Dec. 4, 2007
7285179 Continuous digester for cellulose pulp including method and recirculation system for such digester Oct. 23, 2007
7279070 Method for the continuous cooking of wood raw material for cellulose pulp Oct. 9, 2007
7270725 Pretreatment of chips with white liquor prior to a treatment with black liquor Sep. 18, 2007
7252739 Method for distributing cellulose pulp of low and medium consistency in order to form a uniform pulp web Aug. 7, 2007
7229524 Feeding arrangement for feeding of chips to chip bins Jun. 12, 2007
7217338 Process for continuously cooking chemical cellulose pulp May. 15, 2007
7156952 Method and arrangement for oxygen delignification of cellulose pulp Jan. 2, 2007
7112256 Method for continuous cooking of chemical pulp to improve heat economy Sep. 26, 2006
7105076 Gas phase continuous digester having an inverted top separator with liquor injection Sep. 12, 2006
RE39208 Method of treating material in a continuous digester Aug. 1, 2006
6986828 Process for producing low DP microcrystalline cellulose Jan. 17, 2006
6966970 Method for supplying washing liquid to a process for cooking cellulose pulp Nov. 22, 2005

1 2 3 4 5

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