Medium Temperature Tawny / Grey Strips Iron Oxide Desulfurizer

Medium-Temperature Tawny Or Grey Strips Iron Oxide Desulfurizer

Reaction principle

When the desulfurization reaction temperature is high, reaching 200-400°C, the desulfurization mechanism of iron oxide is different from that at room temperature, and it is generally considered to be carried out in the following three steps:

i. Reduction

Fe₃0₄ with desulfurization activity at 200~400 °C, and the active component in the desulfurizer is Fe₂0. Therefore, it should be fully reduced with reducing gas (H₂ or C0) before use.

3Fe₂O₃+H₂=2Fe₃0₄ +H₂O.     3Fe₂O₃+CO=2Fe₃O₄+CO₂

The reduction reaction is carried out at 170-300 °C, if the reduction temperature exceeds 300 °C, excessive reduction will occur, and iron oxide will be reduced to Fe₃0₄一FeO一Fe in turn, and when Fe0 or Fe appears, the activity of the desulfurizer decreases significantly. Due to the exothermic and counterheat of the reduction reaction head, a slight change in the concentration of the reduction medium may cause overtemperature and excessive reduction. Therefore, when carrying out the reduction operation, the reduction temperature and the concentration of the reduction medium should be strictly controlled.

ii. Organic sulfur conversion

The reduced Fe₃O₄ has a catalytic hydrogenation effect on some organic sulfur, and the reaction is as follows:

COS+H₂=H₂S+C0.      CS₂+2H₂₌2H₂S+CH₄

iii. Hydrogen sulfide removal

In the presence of hydrogen, the desulfurization reaction of Fe₃O₄ is:

Fe₃O₄+3H₂S+H₂₌3FeS+4H₂0