Bleaching and dyeing; fluid treatment and chemical modification – Reactive dye composition – process – or product – Quaternary ammonium group containing dye
Patent
1985-10-21
1987-01-13
Kight, John
Bleaching and dyeing; fluid treatment and chemical modification
Reactive dye composition, process, or product
Quaternary ammonium group containing dye
8901, 530501, C09B 6202, C09B 6244
Patent
active
046362240
ABSTRACT:
A method of producing ammonium salts of sulfomethylated lignins suited for use as dyestuff and coal-water slurry additives comprising of the steps of ionizing the phenol component of a lignin material by-product of the black liquor of 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 sulfur-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.
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Kight John
McDaniel Terry B.
Nutter Nathan M.
Schmalz Richard L.
Westvaco Corporation
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