MODELING OF SULFIDED ZINC TITANATE REGENERATION IN A FLUIDIZED-BED REACTOR .1. DETERMINATION OF THE SOLID CONVERSION RATE MODEL PARAMETERS

Regenerable mixed metal oxide sorbents are prime candidates for the re moval of hydrogen sulfide (a major pollutant) from the hot coal gas in the simplified integrated gasification combined cycle processes. As p art of this sulfur removal process development, reactor models are nee ded for scale-up. It is essential for this work to apply a reliable an d simple modeling correlation for the conversion rate of zinc sulfide or oxygen in the regeneration reaction, The fit of such a model, assum ing uniform conversion of the ZnS, was obtained from ambient pressure thermogravimetric analyzer test data with sulfided zinc titanate sampl es. An activation energy of about 140 kJ/mol was obtained for the rege neration reaction rate constant.