Reaction Between Monomethylhydrazine and Nitrosylruthenium Nitrato Complexes

The influence of monomethylhydrazine(MMH) concentration, acidity, temperature and heat preservation time on decontamination of ruthenium(Ru) have been studied in the paper. By solvent extraction method, a reaction rate equation of the system studied is obtained as follows:r=Kc^6.38(RuNO(Ⅲ))•c^2.60(MMH)c^-0.88(HNO₃). The reaction rate increases with the increase of MMH concentration, while decreases with the increase of nitric acid concentration. The Ru distribution coefficient decreases obviously by 2 h pretreatment with the system of 0.1mol/L MMH and 0.2mol/L HNO₃ at 75℃. By this way, the extractable Ru content decreases, and the effect of pretreatment is obvious.