Method and an apparatus for washing a crude lignin, a soluble carbohydrate containing fraction, a solid fraction and their use
AssigneeUpm-Kymmene Corporation
InventorsSami Turunen, Juha Tamper
Life of this patent
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Abstract
The invention relates to a method and an apparatus for washing a crude lignin slurry (5) formed from plant based raw material, wherein the method comprises separating a soluble carbohydrate containing fraction (10) from the crude lignin slurry (5) by using displacement washing in at least one solid-liquid separation stage (6) so that the crude lignin slurry is prepressed, washed and pressed, and recovering a solid fraction (11) and the soluble carbohydrate containing fraction (10). Further, the invention relates to the soluble carbohydrate containing fraction and the solid fraction, and their uses.
Claims17
A method for washing a crude lignin slurry, wherein the method comprises:
- forming a crude lignin slurry by processing lignocellulose material formed from plant based raw material using enzymatic hydrolysis;
- feeding the crude lignin slurry to at least one solid-liquid separation stage comprising at least one pressure filtration device;
- separating a soluble carbohydrate containing fraction from the crude lignin slurry using displacement washing in the pressure filtration device, the displacement washing including prepressing, washing, and pressing of the crude lignin slurry in connection with the separation of the soluble carbohydrate containing fraction from the crude lignin slurry, the ratio of the washing water to solids in the displacement washing being 0.5:1-6:1 (w/w) and the pressure being kept during the washing;
- and
- recovering a solid fraction and the soluble carbohydrate containing fraction.
Dependencies are inferred from the claim text.