Ammonium lignosulfonates

Details Ammonium lignosulfonates Ammonium lignosulfonates

D - Textiles, Paper

06

P

260/133, 8/50

D06P 1/62 (2006.01) C07G 1/00 (2006.01) C08H 6/00 (2010.01)

Patent

CA 1256428

ABSTRACT OF THE DISCLOSURE A method is disclosed for producing ammonium salts of sulfomethylated lignins suitable for use as dyestuff and coal-water slurry additives. The method comprises the steps of ionizing the phenol component of a lignin material by-product of black liquor from a kraft paper-making process in an alkaline liquid medium, methylolating the lignin material, lowering the pH of the liquid medium to an acid pH to precipitate the methylolated lignin material, washing the precipitated lignin material with water to remove inorganic salts and residual reactants therefrom, and sulfonating the washed, purified methylolated lignin material with an ammonium salt of a sulphur-oxygen containing compound in a liquid medium. The washed, purified methylolated lignin material is preferably sulfonated at an acid pH level to minimize the production of electrolytes when the lignin is to be used for dyeing at low pH. Lignin products produced by the method, as well as dye and coal-water slurry compositions containing such products are also disclosed.

492339

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