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REACTION MECHANISMS OF DRY CA-BASED SORBENTS WITH GASEOUS HCL
Citation:
Jozewicz, W. AND B K. Gullett*. REACTION MECHANISMS OF DRY CA-BASED SORBENTS WITH GASEOUS HCL. I & EC RESEARCH. American Chemical Society, Washington, DC, 34(2):607-612, (1995).
Description:
The mechanisms of HC1 reaction with dry Ca(OH)2 or CaO sorbents in flue gas cleaning applications were investigated by differential scanning calorimetry (DSC), thermogravimetry, and X-ray diffraction. A short-time differential reactor (STDR) was used to contact 1000 ppm HC1 with dry sorbents at temperatures ranging from 100 to 600°C. The product of HC1 reaction with Ca(OH)2 over the 100—600°C range in the STDR was identified as a solid solution of CaCl2•2H2O and CaClOH. Subsequently, the Cl/Ca molar ratio in the product was determined to be less than 2. The product of the HC1 reaction with CaO in the STDR over the 100—600°C range was identified as CaClOH. When scanned by DSC, samples of both CaO and Ca(OH)2 that were previously exposed to HC1 in the STDR revealed an endotherm between 530 and 590°C. The amount of enthalpy correlated well with the chemically determined sample conversion.