Sulfonated ligno-aminodicarboxylates and process for making same

Details Sulfonated ligno-aminodicarboxylates and process for making same Sulfonated ligno-aminodicarboxylates and process for making same

1986-05-30

1988-03-01

Nielsen, Earl

Chemistry: natural resins or derivatives; peptides or proteins;

Lignins or derivatives

Aldehyde, ketone or ozone reacted with a lignin or lignin...

C08H 502

Patent

active

047287284

ABSTRACT:
Disclosed herein are sulfonated ligno-aminodicarboxylic acid and the salts thereof of the formula ##STR1## wherein X is an alkali cation, such as sodium, potassium, lithium, and ammonium, and Lignin denotes the polymeric sulfonated lignin material derived from commercial pulping of wood, straw, corn stalks, bagasse and the like. The dicarboxylic acid is made by a three-step process: (1) amination with ammonia and formaldehyde; (2) cyanomethylation with formaldehyde and sodium cyanide; and (3) hydrolysis of nitrile to carboxylic acid. The sulfonated ligno-aminodicarboxylic acid and its salts are useful as metal complexing agents.

REFERENCES:
patent: 3296159 (1967-01-01), Lissner
patent: 3407188 (1968-10-01), Cavagna
patent: 3671428 (1972-06-01), Kim
patent: 3912706 (1975-10-01), Rachor et al.

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