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US 2019/0292329 A1Published application
Methods of reducing odor in extruded lignin and extruded lignin with reduced odor
AssigneeDomtar Paper Company, LLC
InventorsMark DEANDREA, Michel Jean
Life of this patent
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Abstract
Methods of reducing odiferous compounds in lignin, and reduced-odor lignin produced by the present methods. A solvent, for example a polar solvent such as ethanol, may be mixed with lignin in an extruder to remove odiferous compounds such as mercaptans and phenolic compounds. The polar solvent can then be boiled or evaporated out of the mixture to extract the odiferous compounds from the lignin.
Claims13
A method for reducing odiferous compounds in extruded lignin, the method comprising:
- mixing a source lignin and a solvent in an extruder such that the solvent binds with odiferous compounds in the source lignin;
- causing at least some of the solvent bound with the odiferous compounds to boil or evaporate to remove the bound odiferous compounds from the source lignin and thereby form a reduced-odor lignin having fewer odiferous compounds than the source lignin;
- extruding the reduced-odor lignin through an outlet of the extruder.
Dependencies are inferred from the claim text.