Preparation Of A Dye For Coloring Protein-Based Fibers And Cellulose-Based Materials From The Oxidation Products Of The Manufacture Of A Triphenylmethane Dye
Gray D. Ellis - Proctorville OH Belinda J. DiMarcello - Sparta NJ Debra J. Bradshaw - Huntington WV
Assignee:
BASF Corporation - Southfield MI
International Classification:
D06P 306 D06P 304 D06P 130
US Classification:
8404
Abstract:
A process of preparing a dye composition and a resultant dye composition. The process includes preparing a mixture comprising a triphenylmethane dye and oxidation products by reacting methylenedianiline, aniline, an oxidation catalyst, and an oxidant; separating the oxidation products from the triphenylmethane dye to produce an aqueous solution of oxidation products; treating the solution of oxidation products with a basic compound; separating unreacted aniline from the solution of oxidation products and forming a mixture of oxidation products; and sulfonating the mixture of oxidation products to form a dye composition.
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