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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:
| Patent Number |
Title Of Patent |
Date Issued |
| 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 |
| 6235151 |
Inhibiting scaling in alkaline waste liquor evaporators |
May. 22, 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 |
| 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 |
| 4748004 |
Apparatus for cleaning air ports of a chemical recovery furnace |
May. 31, 1988 |
| 4514256 |
Method of minimizing slagging in the burning of black liquid |
Apr. 30, 1985 |
| 4423533 |
Furnace air port cleaner |
Jan. 3, 1984 |
| 4372813 |
Process for inhibiting the corrosion of equipment made of titanium |
Feb. 8, 1983 |
| 4331507 |
Desilication in alkaline pulp processes |
May. 25, 1982 |
| 4263092 |
Method for treating black liquor using acrylic acid polymer |
Apr. 21, 1981 |
| 4104114 |
Bleach plant operation |
Aug. 1, 1978 |
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