A METHOD AND AN APPARATUS FOR FORMING A LIGNIN FRACTION， A LIGNIN COMPOSITION AND ITS USE

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. 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.