The 2,4-xylidine concentration in the liquid phase was determined by a High Performance Liquid Chromatorgaph (Hewlett-Packard HP1100 series with UV and RI detectors) analyser.
A steady-state wetted wall reactor model was developed taking into account the mass transfer between the phases (N), the reaction between ozone and 2,4-xylidine (R), the 2,4-xylidine vaporization, as well as the stoichiometric ratio of the consumed ozone to the reacted 2,4-xylidine.
i] is Henry's dimensionless coefficient calculated for ozone according to [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] at 20[degrees]C) and for 2,4-xylidine obtained from the literature ([H.
It can be noted that both models predict satisfactory 2,4-xylidine degradation in the CWO process.
The surface reaction of chemisorbed 2,4-xylidine and oxygen is rate controlling as follows :
xyl] and [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] are the adsorption coefficients of 2,4-xylidine and oxygen, respectively.
The values of parameters in the 2,4-xylidine adsorption coefficient (Eq.
The initial concentration of 2,4-xylidine was 205 mg/L and GAC concentration was 0.
The Freundlich isotherm describes the 2,4-xylidine equilibrium situation on GAC better than the Langmuir isotherm.
The kinetic experiments showed the diffusion coefficient in solid phase for 2,4-xylidine to be [D.
The adsorption equilibrium and the diffusion coefficient of 2,4-xylidine were estimated on granulated activated carbon from experimental data.