regenerating nitrogen dioxide, in a second zone of said voloxidation vessel, by reacting {HEAD ~ oxidizing gas} comprising {TAIL ~ nitrogen monoxide} and oxygen at a temperature ranging from 0 80° C., wherein said first zone and said second zone are separate 
comprising
regenerating nitrogen dioxide , in a second zone of said voloxidation vessel , by reacting { HEAD ~ oxidizing gas } comprising { TAIL ~ nitrogen monoxide } and oxygen at a temperature ranging from 0 80 ° C. , wherein said first zone and said second zone are separate
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH