Method for digesting a biomass comprising lignin together with cellulose and/or hemicellulose
AssigneeMaxbiogas GmbH
InventorFriedrich Streffer
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Abstract
The invention relates to a method for digesting a biomass comprising, lignin, cellulose, and hemicellulose, comprising the steps of: (a) contacting the biomass with a first solvent for dissolving the cellulose and/or the hemicellulose, (b) contacting the dissolved cellulose and/or hemicellulose with a precipitant for forming a precipitate comprising cellulose and/or hemicellulose and residual lignin, wherein the precipitant is selected from the group consisting of alkanes, ethers, and esters; and (c) contacting the precipitate with a second solvent for removing residual lignin from the precipitate. The invention further relates to an apparatus for performing such a method.
Claims11
A method for digesting a biomass comprising lignin together with at least one of cellulose and hemicellulose, comprising the steps of:
- (a) contacting the biomass with a first solvent for selectively dissolving at least one of the cellulose and the hemicellulose;
- (b) contacting at least one of the dissolved cellulose and the dissolved hemicellulose with a precipitant for forming a precipitate comprising at least one of the cellulose and the hemicellulose and wherein the precipitate includes a residual lignin, wherein the precipitant is selected from the group consisting of MTB-ether, CPM-ether, diethylether, diisopropylether, ethyl formate, ethyl acetate, propyl acetate, isopropyl acetate, t-butyl acetate, ethyl propionate, ethyl aceto acetate, methyl pentanoate/ethyl acetate 1:3, methylpentanoate/ethyl acetate 2:3, anisole/ethyl acetate 1:3, xylol/MTB-ether 1:3, hexane/MTB-ether 1:3, isooctane/ethyl acetate 1:3, isoamylformate/ethyl acetate 1:1, and mixtures;
- and
- (c) contacting the precipitate with a second solvent for removing the residual lignin from the precipitate.
Dependencies are inferred from the claim text.