Absorption kinetics of calcium oxide with gaseous stream containing hydrogen sulfide

Abstract

The kinetics of absorption of gaseous stream containing 5.6% hydrogen sulfide, 11% hydrogen and a balance of nitrogen, with calcium oxide powder was studied by thermogravometric technique. This reaction was studied in the temperature range of 600 ‐ 750 °C. The initial rates of the reaction were high, however the reaction slackened at conversions in excess of 0.5. The initial stages of the reaction followed the unreacted care model (UCM) in its chemical regime. Based on this model, the reaction rate constant at initial stage was estimated as:

It is quite possible that the sharp decrease of reaction rates at higher conversion is due to the inactivation of some calcium oxide area sites due to adsorption of hydrogen sulfide on these sites.

Key words:

• Absorption Calcium Oxide
• Hydrogen Sulfide
• Kinetics
• Desulfurization by