METHOD FOR LIGNIN PURIFICATION
The invention is directed to a method for producing a purified lignin salt from alkaline spent liquor from the chemical cooking of lignocellulosic raw materials. The method comprises the steps of decreasing the spent liquor pH to form a lignin precipitate suspension; filtering the lignin precipitate...
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| Main Authors | , , |
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| Format | Patent |
| Language | English French |
| Published |
13.08.2020
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| Subjects | |
| Online Access | Get full text |
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| Abstract | The invention is directed to a method for producing a purified lignin salt from alkaline spent liquor from the chemical cooking of lignocellulosic raw materials. The method comprises the steps of decreasing the spent liquor pH to form a lignin precipitate suspension; filtering the lignin precipitate to form a lignin filter cake and a filtrate; mixing the lignin filter cake into a dilution liquid to form an alkalilignin agglomerate colloid; subjecting the alkalilignin agglomerate colloid to large-pore membrane filtration; and recovering a purified lignin salt concentrate.
L'invention concerne un procédé de production d'un sel de lignine purifié à partir de liqueur décomposée alcaline par la cuisson chimique de matières premières lignocellulosiques. Le procédé comprend les étapes consistant à diminuer le pH de la liqueur décomposée pour former une suspension de précipité de lignine ; à filtrer le précipité de lignine pour former un gâteau de filtration de lignine et un filtrat ; à mélanger le gâteau de filtration de lignine dans un liquide de dilution pour former un colloïde d'agglomérat d'alcali-lignine ; à soumettre le colloïde d'agglomérat d'alcali-lignine à une filtration sur membrane à larges pores ; et à récupérer un concentré de sel de lignine purifié. |
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| AbstractList | The invention is directed to a method for producing a purified lignin salt from alkaline spent liquor from the chemical cooking of lignocellulosic raw materials. The method comprises the steps of decreasing the spent liquor pH to form a lignin precipitate suspension; filtering the lignin precipitate to form a lignin filter cake and a filtrate; mixing the lignin filter cake into a dilution liquid to form an alkalilignin agglomerate colloid; subjecting the alkalilignin agglomerate colloid to large-pore membrane filtration; and recovering a purified lignin salt concentrate.
L'invention concerne un procédé de production d'un sel de lignine purifié à partir de liqueur décomposée alcaline par la cuisson chimique de matières premières lignocellulosiques. Le procédé comprend les étapes consistant à diminuer le pH de la liqueur décomposée pour former une suspension de précipité de lignine ; à filtrer le précipité de lignine pour former un gâteau de filtration de lignine et un filtrat ; à mélanger le gâteau de filtration de lignine dans un liquide de dilution pour former un colloïde d'agglomérat d'alcali-lignine ; à soumettre le colloïde d'agglomérat d'alcali-lignine à une filtration sur membrane à larges pores ; et à récupérer un concentré de sel de lignine purifié. |
| Author | ENQVIST, Eric TARVO, Ville TIKKA, Panu |
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| DocumentTitleAlternate | PROCÉDÉ DE PURIFICATION DE LIGNINE |
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| Snippet | The invention is directed to a method for producing a purified lignin salt from alkaline spent liquor from the chemical cooking of lignocellulosic raw... |
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| SubjectTerms | APPARATUS THEREFOR CHEMISTRY COMPOSITIONS BASED THEREON COMPOUNDS OF UNKNOWN CONSTITUTION DERIVATIVES OF NATURAL MACROMOLECULAR COMPOUNDS METALLURGY ORGANIC CHEMISTRY ORGANIC MACROMOLECULAR COMPOUNDS PAPER-MAKING PRODUCTION OF CELLULOSE PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCESFROM CELLULOSE-CONTAINING MATERIALS REGENERATION OF PULPING LIQUORS TEXTILES THEIR PREPARATION OR CHEMICAL WORKING-UP |
| Title | METHOD FOR LIGNIN PURIFICATION |
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