| 摘要 |
<p>PURPOSE:To remove SO2 in high efficiency by contacting SO2 containing HCl gas with saturated HCl containing nitric acid. CONSTITUTION:When cycloalkane oxime hydrochloride 2 prepared in a photo- nitrosation apparatus 1 of cycloalkane is rearranged with sulfuric acid in a Beckmann's rearrangement apparatus 3, lactam sulfate and waste gas 6 consisting essentially of gaseous HCl and a small amount of SO2 are generated. This waste gas is introduced into oxidation reaction apparatus 7 and, on the other hand, saturated HCl solution 13 containing nitric acid replenished from a storage tank 8 is supplied to 7 through a pump 9 and a pipe to bring both material into contact. SO2 in the waste gas 6 is reacted with HNO3, and HCl to form H2SO4, and SO2 is removed. The HCl solution 13 is recirculated to be reused but, because SO2 removal ratio is lowered if H2SO4 concn. is raised, H2SO4 is appropriately discharged out of the system from a discharge port 10.</p> |
