The detoxification of gaseous HCl and nitrous gases is achieved by reacting these in the gas phase, pref. at 25-1400 degrees C and opt. in the presence of a catalyst, pref, a Pt gp. metal or an oxide of Fe, Ni, Cu, Cr and/or Bi and pref. in the absence of O2. Any excess nitrous gases present after reaction can be reduced to N2 in a reducing flame. NO, NO2 and N2O4 react with HCN, giving CO2 and N2, even at low temps., although the reaction is accelerated by the use of a higher temp. and/or a catalyst. The process is useful for the detoxification of solids contg. cyanides and nitrites, esp. hardening salts, which are treated with acid to liberate the toxic gases.
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