Nitric acid process for the manufacture of anthraquinone from o-

Details Nitric acid process for the manufacture of anthraquinone from o- Nitric acid process for the manufacture of anthraquinone from o-

1979-02-01

1980-01-22

Garvin, Patrick

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C 4968, C09B 100

Patent

active

041850246

ABSTRACT:
A process for the manufacture of anthraquinones in which o-benzyl-toluene is first oxidized with 25 to 50 weight-% nitric acid at atmospheric pressure and moderate temperatures, and then further oxidized with a more dilute nitric acid at elevated temperatures and pressures to yield crude o-benzoyl-benzoic acid. The crude product is then esterified with methanol, the methyl ester distilled and, when necessary, recrystallized, and heated with concentrated sulfuric acid to yield anthraquinone in high yield and of a high degree of purity.

REFERENCES:
patent: 4036861 (1977-07-01), Togo et al.
Chemical Abstract, vol. 87, No. 93096w, 1975, Tsutomo et al., "o-Benzoyl-benzoic acid and anthraquinone".

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