NITROSATION KINETICS OF 5-METHYLRESORCINOL
I. JOHANNES
H. TAMVELIUS
L. TIIKMA
Institute of Chemistry,
Tallinn Technical University
15 Akadeemia Rd., Tallinn
12618 Estonia
T. TIIKMA
Thermal Engineering Department,
Tallinn Technical University
116 Kopli St., Tallinn
11712 Estonia
| The kinetics of the acidic nitrosation of 5-methylresorcinol (MR), the main component of oil shale originated phenols, has been studied. Formation of 2,4-dinitroso-5-methylresorcinol was followed by an increase in optical density and temperature of the reaction mixtures over the initial concentrations of the reagents 1×10-4 - 0.05 mol/L and over the acidities pH 4.38-1.5 mol/L of H2SO4. The kinetic model for the two-step consequent-parallel nitrosation was approximated to the second-order rate equation. The apparent rate constant was revealed as the result of three rate constants for the contributing nitrosation reactions of MR with HNO2, H2NO2+ and of the proton-catalysed reaction with H2NO2+. The constants K1 and K2 for the two-step protonisation of NO2- were determined. |