Process for the preparation of 1-amino-4-bromoanthraquinone-2-su

Details Process for the preparation of 1-amino-4-bromoanthraquinone-2-su Process for the preparation of 1-amino-4-bromoanthraquinone-2-su

1978-09-05

1980-07-22

Garvin, Patrick

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C14363

Patent

active

042139090

ABSTRACT:
A process for the preparation of 1-amino-4-bromoanthraquinone-2-sulfonic acid or an alkali metal salt thereof by converting 1-aminoanthraquinone (which can be obtained by reduction of 1-nitroanthraquinone with sodium sulfide and/or sodium bisulfide or reaction of the 1-nitroanthraquinone with ammonia) by contacting the same with oleum at a temperature in the range of 90.degree. to 150.degree. C. optionally in the presence of an alkali metal sulfate and thereafter treating the so-sulfonated composition with bromine at a temperature in the range of from 60.degree. to 100.degree. C. 1-amino-4-bromoanthraquinone-2-sulfonic acid or an alkali metal salt thereof can be precipitated from the reaction mixture either by adjusting the sulfuric acid concentration thereof to 60 to 85 percent by weight or by stirring the reaction mixture into water, which optionally contains an alkali metal sulfate.

REFERENCES:
patent: 1841997 (1932-01-01), Weinland
patent: 2413790 (1947-01-01), Seymour et al.
patent: 2874168 (1959-02-01), Graham et al.
patent: 3931253 (1976-01-01), Krenmueller et al.
patent: 4021456 (1977-05-01), Seha
Chemical Abstract vol. 82, #31183; "1-Amino-4-bromoanthraquinone", Nakahara, 7/24/74.

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