Ciba-Geigy Corporation

Ciba-Geigy Ag

Georg Halfter

Paul Havalda

Bernhard Albrecht

Vinzenz Habermacher

Hans Frey

Walter Jaeckle

Fritz Mindermann

Gerhard Franz

A process for the reduction of aromatic nitro compounds to amino compounds in the liquid phase using iron as reducing agent, which comprises carrying out the reduction continuously such that the reducing iron, based on the amount of nitro compound present in the reactor, is present in an amount substantially in excess of the stoichiometric amount, and effecting the continuous removal of the reaction products such that the substantial excess of reducing iron is also constantly present in the reactor during the reduction.

Continuous reduction process

A semi-continuous process for manufacturing aliphatic or aromatic amino compounds by reduction of the corresponding nitro compounds in an acid medium with iron which is etched with acids or salts is provided.

Semi-continuous process for obtaining amino compounds

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Wyhlen, Germany

Georg Halfter