Process for preparing 1-aminoanthraquinone having high purity

Details Process for preparing 1-aminoanthraquinone having high purity Process for preparing 1-aminoanthraquinone having high purity

1975-12-16

1977-10-18

Shaver, Paul F.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C09B 116

Patent

active

040545865

ABSTRACT:
A process for preparing 1-aminoanthraquinone having high purity, which comprises either
1. hydrogenating 1-nitroanthraquinone in an aqueous medium in the presence of a base using a hydrogenating catalyst, and then oxidizing the hydrogenation product, or
2. hydrogenating crude 1-nitroanthraquinone containing dinitroanthraquinones as impurities or crude 1-aminoanthraquinone containing diaminoanthraquinones as impurities in an aqueous medium in the presence of a base using a hydrogenating catalyst, stopping the hydrogenation at a time when the 1-nitroanthraquinone or 1-aminoanthraquinone has been substantially reduced to 1-aminoanthrahydroquinone but the dinitroanthraquinones or diaminoanthraquinones remain substantially unreduced to diaminoanthrahydroquinones, removing water-insoluble materials from the reaction mixture, and then oxidizing the remaining water-soluble residue.

REFERENCES:
patent: 2738354 (1956-03-01), Kern et al.
patent: 3907838 (1975-09-01), Thiem et al.
patent: 3931253 (1976-06-01), Krenmueller et al.

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