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US 2022/0324894 A1Published application
Processes for extracting lignin from black liquor
AssigneeSuzano S.A.
InventorsVinícius BOHRER LOBOSCO GONZAGA DE OLIVEIRA, Lucas POSSA BORGES FRANCO
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Abstract
The present invention relates to processes for extracting lignin from black liquor. In particular, processes for both extracting acidic lignin and extracting alkaline lignin from black liquor are disclosed, comprising: precipitating lignin by acidification of black liquor; adjusting the temperature to above 60° C.; cooling; separation; and displacement washing and/or washing by ion exchange.
Claims21
1-43. (canceled)
A process for extracting lignin from black liquor, characterized in that it comprises the steps of:
- a) precipitating lignin by acidifying black liquor;
- b) adjusting the temperature to above 60° C.;
- c) cooling;
- d) separation;
- and
- e) displacement washing, ion exchange washing, or both displacement washing and ion exchange washing.
3 more elements
Dependencies are inferred from the claim text.