I am Otto, learning about pigments. As a benchmark in the pigment industry, Lanxess has always been in a leading position. Today, I will learn the preparation method of Bayferrox®’s iron oxide pigment. If there are any errors, please help me correct them.
Lanxess has three methods for making iron oxide red. The first is the Laux-process method, followed by the precipitation method, and there is also the Penniman-Zoph method.
Laux-process method is the aniline method. The Laux-process method is to reduce nitrobenzene to prepare iron oxide, which can be used to prepare iron oxide red, iron oxide black, and iron oxide yellow.
The precipitation method involves reacting iron salts (such as FeSO₄, FeCl₃, etc.) with a solution of sodium hydroxide or potassium hydroxide, adding a solution containing ammonia, stirring at a pH of 8-11, filtering the solid, and finally washing and drying the solid.
The Penniman-Zoph process starts from FeSO₄ solution and reacts with iron filings to form pigment α-FeOOH in the presence of α-FeOOH seed suspension.Calcination of α-FeOOH yields iron oxide red.
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