ABSORPTION OF HYDROGEN-SULFIDE INTO AQUEOUS FERRIC-CHLORIDE SOLUTIONS

Absorption experiments of H2S into aqueous FeCl3 solutions were perfor med in an agitated vessel with a flat interface, and the reaction kine tics and mechanism for this system were analyzed using the data of the absorption rates measured over wide ranges of ionic strength, pH and temperature. It was found that the species which reacts with H2S is Fe OH2+, and the absorption rates could be explained quantitatively by th e theory of gas absorption with an irreversible (1,1)-th order reactio n between H2S and FeOH2+. from the comparison with our previous data f or a H2S-aqueous Fe-2(SO4)(3) solution system, it wits inferred that t he species reacting with H2S in the absorption of H2S into aqueous Fe( III) solutions is FeOH2+, independent of the kind of anion to form iro n salt, and the reaction kinetics and skeleton of reaction mechanism a re identical.