On the basis of laboratory experimental data on SO2 removal by sol-gel
(SG) sorbents in a fixed bed within the temperature range 120-240-deg
rees-C, both the reaction rate and the attainable conversion were foun
d to depend strongly on three factors: quality of SG sorbent, water va
pour concentration in the gas phase, and temperature. The ratio CaSO3/
CaSO4 in spent SG sorbent is strongly related to its reactivity and th
e conditions of sorption. Regeneration of sulfated sorbents in a N2 H-2 gas mixture proved the feasibility of the process in the temperatu
re range 750-850-degrees-C with >90% conversion to CaO.