Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1985-10-21
1987-06-02
Kight, John
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
8543, 530501, C09K 700, C09B 6202
Patent
active
046704825
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 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.
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Kight John
McDaniel Terry B.
Nutter Nathan M.
Schmalz Richard L.
Westvaco Corporation
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