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US 11,078,225 B2Granted
Method and an apparatus for forming a lignin fraction, a lignin composition and its use
AssigneeUpm-Kymmene Corporation
InventorMauno Miettinen
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Abstract
The invention relates to a method and an apparatus for forming a lignin fraction from crude lignin which has been processed by means of a treatment step selected from enzymatic treatment, treatment with ionic liquid and their combinations. The method comprises treating the crude lignin (1) by a lignin liberation in at least one lignin liberation step (3), and separating a lignin fraction (6) in at least one separation step (5). Further, the invention relates to a lignin composition and its use.
Claims13
A method for forming a lignin fraction from crude lignin wherein the method comprises:
- forming crude lignin using enzymatic treatment, treatment with ionic liquid, or the combination thereof;
- treating the crude lignin by a lignin liberation at a temperature of at least 170° C. in at least one lignin liberation step, wherein the lignin is liberated using a dilute acid hydrolysis and a steam explosion and wherein two solid phases are formed;
- and
- separating a lignin fraction and a lignocellulose fraction in at least one solid-solid separation step after the lignin liberation.
1 more element
Dependencies are inferred from the claim text.