Process for the delignifcation and bleaching of a lignocellulose material
First Claim
1. Process for the delignification and bleaching of a lignocellulose material in which an aqueous solution of a redox catalyst and of an oxidizing agent is reacted with the said material, wherein the said catalyst contains an organometallic cation of general formula (VII) ##STR11## in which:
- Mn represents manganese in a III or IV oxidation state, it being possible for the two Mn atoms of this cation to form the pair in the III-III or III-IV or IV-IV oxidation state,n has the value 2, 3 or 4,O representing oxygen,L represents a ligand of general formula (VIII);
##STR12## in which either R1 represents the radical;
##STR13## R2 then representing the radical;
##STR14## R3, R'"'"'3 and R"3 each representing, independently of one another, a group chosen from hydrogen, C1 to C4 lower alkyl, C1 to C4 lower alkoxy or halogen,or R1 represents the radical;
##STR15## R2 and R'"'"'2 then being identical and representing a group chosen from hydrogen or C1 to C4 lower alkyl,R3 representing a group chosen from hydrogen, C1 to C4 lower alkyl, C1 to C4 lower alkoxy or halogen.
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Abstract
A method is provided for delignifying and bleaching a lignocellulose material, wherein an aqueous solution of a redox catalyst and an oxidant is reacted with the material. The catalyst comprises an organometallic cation of the general formula [(1)Mno2 Mn(L)]n+, wherein Mn is manganese (III) or (IV) oxide, the two Mn'"'"'s of this cation may form a pair in a III-III, III-IV or IV-IV oxidative state, n is 2, 3 or 4, O is oxygen, and L is a ligand comprising 4 nitrogen atoms co-ordinating the manganese.
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Citations
13 Claims
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1. Process for the delignification and bleaching of a lignocellulose material in which an aqueous solution of a redox catalyst and of an oxidizing agent is reacted with the said material, wherein the said catalyst contains an organometallic cation of general formula (VII) ##STR11## in which:
- Mn represents manganese in a III or IV oxidation state, it being possible for the two Mn atoms of this cation to form the pair in the III-III or III-IV or IV-IV oxidation state,
n has the value 2, 3 or 4, O representing oxygen, L represents a ligand of general formula (VIII);
##STR12## in which either R1 represents the radical;
##STR13## R2 then representing the radical;
##STR14## R3, R'"'"'3 and R"3 each representing, independently of one another, a group chosen from hydrogen, C1 to C4 lower alkyl, C1 to C4 lower alkoxy or halogen,or R1 represents the radical;
##STR15## R2 and R'"'"'2 then being identical and representing a group chosen from hydrogen or C1 to C4 lower alkyl,R3 representing a group chosen from hydrogen, C1 to C4 lower alkyl, C1 to C4 lower alkoxy or halogen. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
- Mn represents manganese in a III or IV oxidation state, it being possible for the two Mn atoms of this cation to form the pair in the III-III or III-IV or IV-IV oxidation state,
Specification
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- Resources
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Current AssigneeELF Aquitaine Production
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Original AssigneeELF Aquitaine Production
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InventorsGirerd, Jean-Jacques, Guignard, Claude, Boe, Jean-Fran.cedilla.ois, Seris, Jean-Louis, Verlhac, Jean-Baptiste
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Primary Examiner(s)SPEAR JR, FRANK
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Application NumberUS08/356,283Time in Patent Office817 DaysField of Search162/72, 162/76, 162/78, 162/80, 162/84, 162/74US Class Current162/74CPC Class CodesB01J 2531/72 ManganeseB01J 31/1815 with more than one complexi...D21C 9/1036 Use of compounds accelerati...D21C 9/1078 with Mn-containing compounds
