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Class Information
Number: 162/76
Name: Paper making and fiber liberation > Processes of chemical liberation, recovery or purification of natural cellulose or fibrous material > Treatment with particular chemical > Organic > Acids, salts or esters
Description: Processes in which an organic acid, salt or ester thereof is employed.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7481905 |
Process for manufacturing board |
Jan. 27, 2009 |
| 7445691 |
Impregnation of chips with an acid liquid prior to a sulphate pulping process |
Nov. 4, 2008 |
| 7427300 |
Hydrophilic finish for fibrous substrates |
Sep. 23, 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 |
| 7384504 |
Light-stable and process-stable lignocellulosic materials and their production |
Jun. 10, 2008 |
| 7351764 |
Methods to enhance brightness of pulp and optimize use of bleaching chemicals |
Apr. 1, 2008 |
| 7306698 |
Method for producing pulp |
Dec. 11, 2007 |
| 7303649 |
Removal of inorganic elements from wood chips |
Dec. 4, 2007 |
| 7285181 |
Bleaching and brightness stabilization of lignocellulosic materials with water-soluble phosphines or phosphonium compounds |
Oct. 23, 2007 |
| 7285184 |
Cellulosic fiber pulp and highly porous paper products produced therefrom |
Oct. 23, 2007 |
| 7214292 |
Addition of THP or THP+ salt to pulping liquors to destroy catalase and/or catalase producing bacteria |
May. 8, 2007 |
| 7097738 |
Process for producing pulp |
Aug. 29, 2006 |
| 7097737 |
Method of making a modified unbleached pulp for lyocell products |
Aug. 29, 2006 |
| 7081183 |
Method of deresinating pulp using alkyl alcohol alkoxylate surfactants |
Jul. 25, 2006 |
| 7037405 |
Surface treatment with texturized microcrystalline cellulose microfibrils for improved paper and paper board |
May. 2, 2006 |
| 7001484 |
Peroxide bleaching of wood pulp using stabilizers and sodium hydrosulfide reducing agent |
Feb. 21, 2006 |
| 6989449 |
Chlorohydrin and cationic compounds having high affinity for pulp or paper |
Jan. 24, 2006 |
| 6955743 |
Method for producing furfural, acetic acid and formic acid from spent pulp-cooking liquor |
Oct. 18, 2005 |
| 6946056 |
Method for regulating the manufacturing of pulp by optically measuring the amount of hexenuronic acid |
Sep. 20, 2005 |
| 6923888 |
Process for recovering organic acids from bleaching liquors |
Aug. 2, 2005 |
| 6866749 |
Method for bleaching paper pulp with organic peracids followed by peroxide and sodium hydroxide |
Mar. 15, 2005 |
| 6777103 |
Fiber cement composite material using biocide treated durable cellulose fibers |
Aug. 17, 2004 |
| 6776876 |
Method of treating cellulosic pulp to remove hexenuronic acid |
Aug. 17, 2004 |
| 6770168 |
Process for oxygen pulping of lignocellulosic material and recorvery of pulping chemicals |
Aug. 3, 2004 |
| 6752902 |
Preparation of chemical pulp and xylose, utilizing a direct acid hydrolysis on the pulp |
Jun. 22, 2004 |
| 6736934 |
Method of pretreating pulp in an acid tower prior to bleaching with peroxide |
May. 18, 2004 |
| 6719906 |
Process for the preparation of solutions of anionic organic compounds |
Apr. 13, 2004 |
| 6706143 |
Minimizing chlorinated organics in pulp bleaching processes |
Mar. 16, 2004 |
| 6702921 |
Methods to enhance pulp bleaching and delignification using an organic sulfide chelating agent |
Mar. 9, 2004 |
| 6679972 |
Process for the bleaching of a pulp suspension by separating calcium from lignin |
Jan. 20, 2004 |
| 6666950 |
Process for deinking paper using a triglyceride |
Dec. 23, 2003 |
| 6649023 |
Process for digesting woodchips and digester additives |
Nov. 18, 2003 |
| 6627041 |
Method of bleaching and providing papermaking fibers with durable curl |
Sep. 30, 2003 |
| 6605181 |
Peroxide bleach sequence including an acidic bleach stage and including a wash stage |
Aug. 12, 2003 |
| 6599326 |
Inhibition of pulp and paper yellowing using hydroxylamines and other coadditives |
Jul. 29, 2003 |
| 6569286 |
Method for the alkaline bleaching of pulp with a peroxyacid based oxygen bleaching species using an agglomerated bleach activator |
May. 27, 2003 |
| 6562191 |
Process for producing pulp with a mixture of formic acid and acetic acid as cooking chemical |
May. 13, 2003 |
| 6554958 |
Process for the delignification and bleaching of chemical paper pulps with hydrogen peroxide and at least one polymer |
Apr. 29, 2003 |
| 6551452 |
Process for digesting woodchips and digester additives |
Apr. 22, 2003 |
| 6540872 |
Process for chlorine dioxide bleaching using a chelating agent without an intermediate wash |
Apr. 1, 2003 |
| 6533896 |
Method for the production of precleaned pulp |
Mar. 18, 2003 |
| 6524437 |
Process for peroxide bleaching wherein the concentrations of Mn and Fe are monitored and maintained |
Feb. 25, 2003 |
| 6521084 |
Chemical digestion process using organosiloxane compounds |
Feb. 18, 2003 |
| 6511578 |
Bleaching and delignifying cellulosic pulp using caroate/caro's acid solution |
Jan. 28, 2003 |
| 6500303 |
Inhibition of pulp and paper yellowing using nitroxides, hydroxylamines and other coadditives |
Dec. 31, 2002 |
| 6475338 |
Method of minimizing transition metal ions during chemical pulping in a digester by adding chelating agent to the digester |
Nov. 5, 2002 |
| 6458242 |
Ozone bleaching process using oxalic acid addition |
Oct. 1, 2002 |
| 6447644 |
Inhibition of pulp and paper yellowing using nitroxides, hydroxylamines and other coadditives |
Sep. 10, 2002 |
| 6432266 |
Process for bleaching chemical pulp simultaneously with chlorine dioxide, peroxide and a reaction catalyst |
Aug. 13, 2002 |
| 6428653 |
Method of bleaching with formamidine sulfinic acid using a reducing agent to eliminate residual peroxide |
Aug. 6, 2002 |
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