Monday, April 19, 2010

Reaction with iron oxide

Gas is pumped through a container of hydrated iron(III) oxide, which combines with hydrogen sulfide.

Fe2O3(s) + H2O(l) + 3 H2S(g) → Fe2S3(s) + 4 H2O(l)

In order to regenerate iron(III) oxide, the container must be taken out of service, flooded with water and aerated.

2 Fe2S3(s) + 3 O2(g) + 2 H2O(l) → 2 Fe2O3(s) + H2O(l) + 6 S(s)

On completion of the regeneration reaction the container is drained of water and can be returned to service.

The advantage of this system is that it is completely passive during the extraction phase

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