METHOD FOR SIMULTANEOUSLY PREPARING IRON OXIDE RED PIGMENT AND AROMATIC AMINE

The present disclosure provides a method for simultaneously preparing an iron oxide red pigment and an aromatic amine. In the method, an aromatic nitro compound and ferrous iron are first used to prepare an iron oxide red seed crystal under the action of a catalyst, and then iron powder is used to r...

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Bibliographic Details
Main Authors DUAN, Weidong, WEI, Yu, ZHANG, Guofu
Format Patent
LanguageEnglish
French
German
Published 22.02.2023
Subjects
ACYCLIC OR CARBOCYCLIC COMPOUNDS
CHEMISTRY
COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F
INORGANIC CHEMISTRY
METALLURGY
ORGANIC CHEMISTRY
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Summary:The present disclosure provides a method for simultaneously preparing an iron oxide red pigment and an aromatic amine. In the method, an aromatic nitro compound and ferrous iron are first used to prepare an iron oxide red seed crystal under the action of a catalyst, and then iron powder is used to reduce the aromatic nitro compound and generate iron oxide in situ which grows into iron oxide red with pigment performance on the seed crystal. The method provides a clean and economical way for the reduction of an aromatic nitro compound (especially those in which there are other easily-reduced substituents on an aromatic ring) to prepare an aromatic amine.
Bibliography:Application Number: EP20200907395