Method for precipitating lignin from organosolv pulping liquors
AssigneesFraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V., Max-Planck-Gesellschaft Zur FöRderung Der Wissenschaft E.V.
InventorsMoritz LESCHINSKY, Gerd UNKELBACH, Peter SCHULZE, Heike LORENZ, Andreas SEIDEL MORGENSTERN
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Abstract
The present invention relates to a method for precipitating lignin from organosolv pulping liquors. For this purpose, the organosolv pulping liquor is introduced as a precipitation medium in an already existing aqueous dispersion of lignin particles or a filtrate of an aqueous dispersion of lignin particles, wherein a separate, lignin-containing phase in a dispersed state is produced.
Claims19
1-18. (canceled)
A method for precipitating lignin from an organosolv pulping liquor comprising a mixture of water, at least one organic solvent and lignin which is dissolved in the mixture, the method comprising:
- introducing the organosolv pulping liquor into an aqueous dispersion of lignin particles or into a filtrate of an aqueous dispersion of lignin particles, and
- removing the at least one organic solvent at least partially from the mixture produced by introducing the organosolv pulping liquor into the aqueous dispersion so that the content of the at least one organic solvent in the mixture is kept lower than in the organosolv pulping liquor,
- wherein a separate lignin-comprising phase, which is present in the mixture in a dispersed state, is formed from the dissolved lignin.
Dependencies are inferred from the claim text.