Low electrolyte sodium lignosulfonates

Details Low electrolyte sodium lignosulfonates Low electrolyte sodium lignosulfonates

C - Chemistry, Metallurgy

09

B

260/133, 8/50

C09B 67/46 (2006.01) C09D 17/00 (2006.01) D06P 1/62 (2006.01) C07G 1/00 (2006.01) C08H 6/00 (2010.01)

Patent

CA 1256427

ABSTRACT OF THE DISCLOSURE A method is disclosed of producing sodium salts of low electrolyte-containing sulfonates suitable for use as dye and print paste additives. The method comprises the steps of ionizing the phenol component of a lignin material in an alkaline liquid medium, methylolating the ionized phenol component of the lignin material, lowering the pH of the liquid medium to the acid pH range 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 a sodium 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 salts and electrolytes produced when acidifying the lignin for dye and print paste composition additives. Lignin products produced by the method, and dye and print paste compositions containing such produced are also disclosed.

492338

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