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Class Information
Number: 162/48
Name: Paper making and fiber liberation > Processes of chemical liberation, recovery or purification of natural cellulose or fibrous material > With cleaning, preserving or conditioning of apparatus
Description: Processes which involve a treatment of the apparatus employed to clean, preserve or condition it for use in the digestion operation.

Patents under this class:
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Patent Number Title Of Patent Date Issued
8540845 Method and system for stabilizing dry-based density of wood chips to be fed to a chip refining process Sep. 24, 2013
8409402 Method and apparatus for filling and cleaning a pulp tower Apr. 2, 2013
8303768 Method of monitoring and inhibiting scale deposition in pulp mill evaporators and concentrators Nov. 6, 2012
8221584 Method and apparatus for removing sheets of fibres from banana plants for the production of paper products Jul. 17, 2012
8152965 Method and device for emptying the floor of a soda recovery boiler Apr. 10, 2012
8052840 Pulping additives for a reduction of resin from Kraft pulp Nov. 8, 2011
7985318 Method of monitoring and inhibiting scale deposition in pulp mill evaporators and concentrators Jul. 26, 2011
7972479 Process for the control of pitch Jul. 5, 2011
7807021 Compositions and processes to increase pulp yield, reduce extractives, and reduce scaling in a chemical pulping process Oct. 5, 2010
RE41552 Composition for the production of improved pulp Aug. 24, 2010
7749354 Digester wash extraction by individual screen flow control Jul. 6, 2010
7390415 Method and compositions for preventing or reducing aluminosilicate scale in alkaline industrial processes Jun. 24, 2008
7300542 Method for inhibiting calcium salt scale Nov. 27, 2007
7282115 Method for mitigating the interference caused by high-molecular weight-by-products in pulping processes Oct. 16, 2007
7172677 Method for inhibiting calcium salt scale Feb. 6, 2007
7169263 Coarse dirt collector for removing coarse material from a pulper and corresponding method Jan. 30, 2007
7052579 Pitch control composition May. 30, 2006
6939439 Batch process for producing chemical pulp by removing and reintroducing calcium-containing spent liquor in the digester Sep. 6, 2005
6890404 Composition for the production of improved pulp May. 10, 2005
6869503 Composition for inhibiting calcium salt scale Mar. 22, 2005
6716307 Process and system for the removal of scale build-up Apr. 6, 2004
6527915 Proteins for use as pitch and stickies control agents in pulp and papermaking processes Mar. 4, 2003
6315863 Chlorine dioxide pulp bleaching process having reduced barium scaling by recycling post-chlorination waste filtrate Nov. 13, 2001
6235152 Process for treating an aqueous liquid containing forming calcium scale salts by adding a copolymer of 1,2-dihdroxy-3-butene antiscalant May. 22, 2001
6235149 Acrylic acid/maleic acid copolymers as detackification agents for adhesives contained in secondary fiber May. 22, 2001
6235151 Inhibiting scaling in alkaline waste liquor evaporators May. 22, 2001
6146495 Kraft process for the production of wood pulp by adding a copolymer of 1,2-dihydroxy-3-butene antiscalant Nov. 14, 2000
6110381 Method and composition for inhibiting microbial adhesion on surfaces Aug. 29, 2000
6090240 Method of inhibiting scaling in black liquor evaporators Jul. 18, 2000
5954066 Method for controlling chemical reaction Sep. 21, 1999
5858170 Method for pressurized peroxide bleaching Jan. 12, 1999
5728264 Avoidance of salt scaling by acidic pulp washing process Mar. 17, 1998
5693184 Reduction of salt scale precipitation by control of process stream pH and salt concentration Dec. 2, 1997
5672279 Method for using urea hydrochloride Sep. 30, 1997
5647955 Method of reducing scaling of heat transfer surfaces in an evaporation plant of a sulphate cellulose mill Jul. 15, 1997
5565061 Method and apparatus for removing scales deposited on the strainer of a pulp digester Oct. 15, 1996
5562830 Calcium carbonate scale controlling method Oct. 8, 1996
5554259 Reduction of salt scale precipitation by control of process stream Ph and salt concentration Sep. 10, 1996
5536367 Pulp digester cleaning system Jul. 16, 1996
5534157 Polyether polyamino methylene phosphonates for high pH scale control Jul. 9, 1996
5503711 Method of rehabilitating a wood pulp digester Apr. 2, 1996
5490942 Process of inhibiting oxalate scale formation Feb. 13, 1996
5441602 Process for the prevention of scale formation in wood pulp production Aug. 15, 1995
5409571 Scale deposit inhibitor for kraft digesters and method for controlling scale deposition in kraft digesters Apr. 25, 1995
5407583 Controlling scale in black liquor evaporators Apr. 18, 1995
5320757 Method of inhibiting calcium oxalate scale deposition Jun. 14, 1994
5254286 Composition for controlling scale in black liquor evaporators Oct. 19, 1993
5092961 Apparatus for cleaning a porous cover Mar. 3, 1992
4941946 Process for decreasing the tendency to form deposits in plants for evaporating spent sulfite liquors Jul. 17, 1990
4872995 Method for calcium oxalate scale control Oct. 10, 1989

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