Method for preparing low electrolyte sodium lignosulfonates

Details Method for preparing low electrolyte sodium lignosulfonates Method for preparing low electrolyte sodium lignosulfonates

1986-01-17

1988-04-26

Phillips, Delbert R.

Chemistry: natural resins or derivatives; peptides or proteins;

Lignins or derivatives

8550, 8587, C07G 100, C09B 6700

Patent

active

047405902

ABSTRACT:
An improved method of producing sodium salts of low electrolyte-containing lignosulfonates suited for use as dye and print paste additives, comprising the steps of (1) methylolating a sodium salt of a lignin compound in an alkaline aqueous medium by the addition of a suitable methylolating component, such as formaldehyde, (2) adding sulfur dioxide to the methylolated lignin in aqueous medium to lower the pH of the lignin to a pH of between about 6.1 to 6.3, (3) heating the resultant aqueous composition containing the methylolated lignin to sulfonate the same by reaction with a sulfur-containing compounds present therein.
Resultant sodium salt lignosulfonate products suitable as additives in dyestuffs and dyestuff compositions containing such additives are disclosed.

REFERENCES:
patent: 4590262 (1986-05-01), Dilling

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