Chemistry: natural resins or derivatives; peptides or proteins; – Lignins or derivatives – Aldehyde – ketone or ozone reacted with a lignin or lignin...
Patent
1987-06-15
1988-08-16
Nielsen, Earl
Chemistry: natural resins or derivatives; peptides or proteins;
Lignins or derivatives
Aldehyde, ketone or ozone reacted with a lignin or lignin...
530500, C07G 100
Patent
active
047645970
ABSTRACT:
An improved method of producing methylolated lignins from the black liquor residue of a kraft wood-pulping process, which methylolated lignins may be further employed in other chemical reactions, such as in the production of sulfomethylated lignin salts suited for use as dyestuff dispersants, comprising the steps of oxidizing the black liquor residue of a kraft wood-pulping process containing lignin, organic, and inorganic salts, treating the black liquor residue with an aldehyde to methylolate the lignin therein, lowering the pH of the black liquor residue to precipitate the lignin therefrom, and isolating and recovering the methylolated lignin for subsequent chemical reactions. The black liquor residue of the kraft pulping process is oxidized, before methylolation of the lignin therein, to reduce the presence of sodium sufide in the black liquor residue to about 1 percent or less.
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McDaniel Terry B.
Nielsen Earl
Schmalz Richard L.
Westvaco Corporation
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