Kinetics of reaction between hydrazine and nitrous acid in emulsion of 30% TBP in n-dodecane-nitric acid aqueous solution

Kinetics of reaction between hydrazine and nitrous acid in mixed two-phase system 30% TBP in n-dodecane-nitric acid has been studied. It is established that in aqueous phase acidity range 0.12-0.51 mol/l HNO3 and hydrazine 3x10-3-6.5x10-2 mol/l the reaction rate is described by the equation - d[HNO2]0/dt Ksub(Eh)[HNOsub(2)]sub(0)x[Nsub(2)Hsub(4)]sup(0.8)[HNOsub(3)]sub(v)sup(1.3), where Ksub(Eh)=19.2 lsup(2.1)/molsup(2.1)xmin at the temperature 9 deg C and phase volumes ratio n=Vsub(0)/Vsub(v) equal to 30. It is shown that increase of n from 5 to 30 results in approximately 3 times decrease of the reaction rate. On the basis of Ksub(Eh) dependence on the temperature (3.0-13.5 deg C) the reaction activation energy, being equal to 79.5 kJ/mol, is determined. Possible mechanism of the reaction is discussed