Chemical method for lignin depolymerization
AssigneesT. Watababe, K. Messner
InventorsTakashi Watanabe, Kurt Messner, Karin Koller
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Abstract
A process for depolymerizing and/or chemically modifying lignin or lignin-like compounds in which a solution of copper and peroxide acts on lignin and/or lignin-like substance at a temperature of less than 100° C., characterized in that the solution is an aqueous solution containing copper or a copper complex, a coordination compound and peroxide and wherein the concentration of the copper or copper complex is between 0.001% and 5%, and wherein the concentration of the coordination compound is lower than 20% and wherein the concentration of peroxide is between 0.01% and 20%.
Claims16
A process for depolymerizing and/or chemically modifying lignin or lignin-like compounds in which a solution of copper and peroxide acts on lignin and/or lignin-like substance at a temperature of less than 100° C., characterized in that the solution is an aqueous solution containing copper or a copper complex, a coordination compound and peroxide wherein the concentration of the copper or copper complex is between 0.001% and 5%, the concentration of the coordination compound is lower than 20% and the concentration of peroxide is between 0.01% and 20%.
A process for depolymerizing and/or chemically modifying lignin or lignin-like compounds comprising degrading the lignin or lignin-like compounds at a temperature of less than 100° C. in an aqueous solution containing copper or a copper complex, a coordination compound and peroxide, wherein the coordination compound is selected from the group consisting of nitrogen-containing compounds, hydroxyl-containing compounds, ether containing compounds, sulfur containing compounds, compounds containing olefinic double bonds and mixtures thereof.
A process for depolymerizing and/or chemically modifying lignin or lignin-like compounds comprising degrading the lignin or lignin-like compounds at a temperature of less than 100° C. in an aqueous solution containing copper or a copper complex, a coordination compound and peroxide, wherein the coordination compound is selected from the group consisting of pyridine, histidylglycine, phthalocyanine, acetonitril, catechol, 18-crown-6, mercaptosuccinic acid, 1,3-cyclohexadiene and mixtures thereof.
Dependencies are inferred from the claim text.