Thermal and Radiation Oxidations of Benzene to Phenol in Aqueous Solutions Containing Metal Ions at Elevated Temperatures. I. The Thermal Behavior of Iron Sulfate and Chloride in Aqueous Solutions without Benzene

The rate of the ferrous oxidation at 150°C is 6.10×10−4sec−1 for sulfate, and 2.78×10−4sec−1 for chloride at the oxygen pressure of 30 atm. The precipitation reaction of iron species is through hydrolyzed ferric ions even in the ferrous solution. The rate of precipitation for ferric sulfate is given in Fig. 7, with the activation energy of 12.5 kcal./mol. The precipitate is amorphous at 100°C and completely α-Fe2O3 at 200°C.