Title:
MANUFACTURE OF QUINIZARINE
Document Type and Number:
Japanese Patent JPS5513289
Kind Code:
A
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 SO3 and the weight ratio of p-chlorophenol to the total amount of H2SO4+SO3 is 1:1.5 to 4.0. Yields and purity of the product are outstanding, despite the concentrated procedure.
More Like This:
Inventors:
RAINORUTO SHIYUMITSUTSU
Application Number:
JP8655179A
Publication Date:
January 30, 1980
Filing Date:
July 10, 1979
Export Citation:
Assignee:
BAYER AG
International Classes:
C07C46/00; C07C45/00; C07C45/45; C07C50/34; C07C67/00; C09B1/04; (IPC1-7): C07C46/00; C07C50/34
Domestic Patent References:
| JPS5384956A | 1978-07-26 |
Foreign References:
| US2445538A | 1948-07-20 |