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REACTION MECHANISMS OF DRY CA-BASED SORBENTS WITH GASEOUS HCL
Citation:
Jozewicz, W. AND B. Gullett. REACTION MECHANISMS OF DRY CA-BASED SORBENTS WITH GASEOUS HCL. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-95/185, 1995.
Description:
The paper discusses an investigation of the mechanisms of HCl reaction with dry Ca(OH)2 or CaO sorbents in flue gas cleaning applications using differential scanning calorimetry (DSC), thermogravimetry (TGA), and X-ray diffraction (XRD). hort-time differential reactor (STDR) was used to contact 1000 ppm HCl with dry sorbents at temperatures from 100 to 600 C. he product of HCl reaction with Ca(C)H)2 over the 100 to 600 C range in the STDR was identified as a solid solution of CaCL,2-2H2O and CaClOH. ubsequently, the Cl/Ca molar ratio in the product was determined to be 2. he product of the HCl reaction with CaO in the STDR over the 100 to 600 C range was identified as CAClOH. hen scanned by DSC, samples of both CaO and Ca(OH)2 that were previously exposed to HCl in the STDR revealed an endotherm between 530 and 590 C. The amount of enthalpy correlated well with the chemically determined sample conversion.