Inventors:
John W. Rowe - Madison WI
Harry P. Gregor - New York NY
Assignee:
The United States of America as represented by the Secretary of
Agriculture - Washington DC
International Classification:
D21C 2104
Abstract:
An aliphatic organic acid fraction is separated from the kraft black liquor by subjecting the liquor to ultrafiltration, treating the resulting permeate by electrodialysis, acidifying the resultant deionate to about pH 4-5, separating the lignin solids which precipitate following this acidification, raising the pH of the separated solution to about 7-8 and finally subjecting the neutralized solution to electrodialytic water-splitting.