Abstract
During gasification, chloride species in coal are converted to HCl, a reactive, corrosive, and toxic gas that must be removed to meet environmental regulations, to protect power generation equipment, and to minimize deterioration of hot coal gas desulfurization sorbents. Thermochemical calculations indicated that sodium-based sorbents are capable of reducing HCl vapor to less than 1 ppm in coal gas streams up to a temperature of 650 C, but they are not easily regenerable. The mineral nahcolite (NaHCO{sub 3}) was used to make inexpensive sorbents suitable for fixed- and fluidized-bed reactors. Bench-scale tests confirmed that these sorbents have >50 wt% chloride capacity. The reaction of HCl with the sorbent was rapid and followed overall first-order kinetics.
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