DETAILED STUDY OF HOCL-]CL-2+H2O IN SULFURIC-ACID(HCL)

Reactive uptake coefficients for HOCl as a function of [HCl] were meas ured in a rotating wetted-wall flow reactor for several sulfuric acid solutions containing between 49 and 67 wt % H2SO4 at 220 and 250 K. Th e solubility of HOCl in sulfuric acid solutions at 220 and 250 K was a lso measured. Using these measured solubilities, calculated HCl solubi lities, and estimated diffusivities for HOCl, the second-order rate co efficients (k(II)) in the liquid were extracted. At 250 K, k(II) incre ases with increasing acid concentration, from 3 x 10(5) M-1 s(-1) at 4 9 wt % acid to 5 x 10(6) M-1 s(-1) at 67 wt %. It is suggested that th e reaction may involve an initial protonation of HOCl, followed by rea ction of H2OCl+ with Cl-.