Process for the preparation of the dyestuff direct yellow 11 in

Details Process for the preparation of the dyestuff direct yellow 11 in Process for the preparation of the dyestuff direct yellow 11 in

1981-02-23

1982-01-12

Tungol, Maria Parrish

Bleaching and dyeing; fluid treatment and chemical modification

Dye concentrate composition wherein an additional amount of...

260143, 260205, 260505R, C07C10500, C09B 5604, C09B 6702, C09B 6726

Patent

active

043103316

ABSTRACT:
The invention relates to a process for the preparation of the dyestuff Direct Yellow 11 directly in the form of stable concentrated solutions, in which caustic soda in aqueous solution is reacted, at a temperature from 40.degree. to 90.degree. C., with a solution containing 4-nitro-toluene-2-sulfonic acid, one or more alkanolamines, one or more alcohols containing an etheroxide function or a second alcohol function, then the caustic soda is neutralized by addition of sulfuric acid and the sodium sulfate thus formed is separated by filtration. The solutions obtained by the process according to the invention are particularly suitable for dyeing cellulosic materials and leather.

REFERENCES:
patent: 2821550 (1958-01-01), Strobel
patent: 3122529 (1964-02-01), Huey et al.
patent: 3547774 (1970-12-01), Rebhahn et al.
patent: 3557079 (1971-01-01), Doody
patent: 3905949 (1975-09-01), Perkins et al.
patent: 3953419 (1976-04-01), Pedrazzi

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