Enhancement of Decomposition of Chlorobenzene and In-Situ Cl Dry-Sorption by CaO and Na₂CO₃

Abstract

The decomposition of chlorobenzene (C₆H₅Cl) and dry sorption of Cl released from C₆H₅Cl by CaO and Na₂CO₃ sorbents were investigated.
In a C₆H₅Cl–N₂ atmosphere without CaO and Na₂CO₃, it was found that C₆H₆, C₂H₂, CH₄ and HCl were generated by the thermal decomposition of C₆H₅Cl at temperatures above 1073 K. Further, the presence of CaO and Na₂CO₃ sorbents was found to promote the decomposition of C₆H₅Cl in the temperature range of 673–1273 K. During C₆H₅Cl decomposition in the presence of CaO or Na₂CO₃, it was recognized that gaseous Cl compounds formed by the decomposition of C₆H₅Cl were absorbed on CaO or Na₂CO₃, producing CaCl₂ or NaCl. As for the Cl sorption ratio on CaO and Na₂CO₃, the highest conversion values of CaO to CaCl₂ of 0.23 and Na₂CO₃ to NaCl of 0.38 were obtained at temperatures of 1073 K and 873 K, respectively.