Process for the preparation of diamino-dihydroxy anthraquinone d

Details Process for the preparation of diamino-dihydroxy anthraquinone d Process for the preparation of diamino-dihydroxy anthraquinone d

1975-07-25

1977-06-14

Wyman, Daniel E.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C 9726

Patent

active

040296806

ABSTRACT:
The invention relates to the preparation of anthraquinone disperse dyestuffs from aqueous solutions containing anthraquinone-sulphonic acid mixtures, especially from appropriate waste waters by treating such solutions with chloric acid/hydrochloric acid or their salts or activated halogene, isolating the halogenoanthraquinones thereby obtained, subjecting them to dinitration and warming the dinitrohalogenoanthraquinones thus obtained with elementary sulphur in sulphuric acid optionally in the presence of boric acid. The reaction products are .beta.-halogenated diaminodihydroxyanthraquinones which are suitable for the dyeing of polyesters and polyamides in blue shades with good fastness properties.

REFERENCES:
patent: 1845623 (1932-02-01), Prager et al.
patent: 2487110 (1949-11-01), Deinet et al.
patent: 2990413 (1961-06-01), Gehrke
patent: 3378572 (1968-04-01), Wilder
patent: 3636008 (1972-01-01), Yamada et al.

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