Process for the preparation of quinizarin

Details Process for the preparation of quinizarin Process for the preparation of quinizarin

1979-05-30

1983-06-07

Sneed, Helen M. S.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C 4968, C09B 102

Patent

active

043870546

ABSTRACT:
A process, which does not pollute the environment, for the preparation of quinizarin consists in reacting a mixture of phthalic anhydride p-chlorophenol, sulphuric acid and boric acid or boric anhydride at elevated temperatures in such a way that, in the reaction mixture, there is sulphuric acid preferably containing 10-20% of free SO.sub.3 and the weight ratio of p-chlorophenol to the total amount of H.sub.2 SO.sub.4 +SO.sub.3 is 1:1.5 to 4.0. Yields and purity of the product are outstanding, despite the concentrated procedure.

REFERENCES:
patent: 1087412 (1914-02-01), Unger et al.
patent: 1790510 (1931-01-01), Orelup
patent: 2445538 (1948-07-01), Sievenpiper
patent: 2752364 (1956-06-01), Shrader

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