US2010084101A1PendingUtilityA1

Method for functionalising carbohydrates

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Assignee: ARKEMA FRANCEPriority: Feb 14, 2007Filed: Jan 25, 2008Published: Apr 8, 2010
Est. expiryFeb 14, 2027(~0.6 yrs left)· nominal 20-yr term from priority
Inventors:Christophe CalaisDominique LachenalGerard Mortha
C08B 15/04D21C 9/10D21C 9/16D21C 9/1036C08B 15/10
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Claims

Abstract

The invention relates to a method for functionalising carbohydrates, that comprises at least one step during which the carbohydrates react with an oxidizing agent in the presence of copper-phenanthroline complex. The invention more particularly relates to a method for functionalising cellulose fibers for the paper industry.

Claims

exact text as granted — not AI-modified
1 . A method for functionalising carbohydrates, including paper pulps, cellulose and polysaccharides, including starch, comprising reacting carbohydrates with an oxidizing agent in the presence of a copper-phenanthroline complex. 
   
   
       2 . A method for functionalising cellulosic fibers of paper pulps characterized in that it comprises delignifying lignocellulosic material to form cellulosic material followed by bleaching the cellulosic material with an oxidizing agent in the presence of a copper-phenanthroline complex. 
   
   
       3 . A method for functionalising cellulosic fibers of paper pulps characterized in that it comprises the steps of:
 delignifying lignocellulosic material to form cellulosic material,   (b) treating the cellulosic material with alkaline to extract lignin,   (c) bleaching the lignin with an oxidizing agent in the presence of a copper-phenanthroline complex.   
   
   
       4 . The method as claimed in  claim 2 , characterized in that the bleaching is carried out on cellulosic material having a Kappa number ≦6 and an ISO brightness ≧60%. 
   
   
       5 . The method as claimed in  claim 1 , characterized in that the oxidizing agent is hydrogen peroxide. 
   
   
       6 . The method as claimed in  claim 1 , characterized in that the temperature is lower than 85° C. 
   
   
       7 . The method as claimed in any one of  claims 2  to  6 , characterized in that the reagent(s) for the delignification step is (are) oxygen (stage O) or oxygen in combination with hydrogen peroxide (stage Op), chlorine dioxide (stage D) and/or ozone (stage Z). 
   
   
       8 . The method as claimed in  claim 2 , characterized in that the bleaching is via chlorine dioxide and/or hydrogen peroxide. 
   
   
       9 . The method as claimed in  claim 2 , characterized in that the paper pulp is of the chemical type. 
   
   
       10 . The method as claimed in  claim 2 , further comprising crosslinking said cellulosic materials after bleaching. 
   
   
       11 . The method as claimed in  claim 3 , characterized in that the bleaching is carried out on cellulosic material having a Kappa number ≦6 and an ISO brightness ≧60%. 
   
   
       12 . The method as claimed in  claim 2 , characterized in that the oxidizing agent is hydrogen peroxide. 
   
   
       13 . The method as claimed in  claim 3 , characterized in that the oxidizing agent is hydrogen peroxide. 
   
   
       14 . The method as claimed in  claim 1 , characterized in that the temperature is lower than 85° C. 
   
   
       15 . The method as claimed in  claim 1 , characterized in that the temperature between 35 and 65° C. 
   
   
       16 . The method as claimed in  claim 2 , characterized in that the temperature is lower than 85° C. 
   
   
       17 . The method as claimed in  claim 2 , characterized in that the temperature is between 35 and 65° C. 
   
   
       18 . The method as claimed  claim 3 , characterized in that the treatment temperature is lower than 85° C. 
   
   
       19 . The method as claimed in  claim 3 , characterized in that the treatment temperature is between 35 and 65° C. 
   
   
       20 . The method as claimed  claim 3 , characterized in that the bleaching is via chlorine dioxide and/or hydrogen peroxide. 
   
   
       21 . The method as claimed in  claim 3 , characterized in that the paper pulp is of the chemical type. 
   
   
       22 . The method as claimed  claim 3 , further comprising crosslinking said lignin after bleaching.

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