Overall Reaction Rate Analysis of Ion-Exchange Resins Incineration by Fluidized Bed.

Abstract

A kinetic study on the incineration of ion-exchange resins was conducted using fluidized bed. In the experiment, cation or anion exchange resins with known quantities were fed into the fluidized bed maintained at a constant temperature from 550 to 750°C. The apparent reaction rate constants k ap could be evaluated by the time for completion of combustion derived from the continuous measurement of CO2 concentration in the off-gas. It was confirmed that the reaction of the ion-exchange resins proceeded with the shrinking particle model forming no solid product layer and the rate of disappearance of the resins could be expressed by the surface chemical reaction. Most preferable conditions for incinerating the ion-exchange resins were found to be about 650°C for temperature and more than 4.91 x 10−2 m-s−1 for the air velocities at fluidized bed u B . Also, k ap for cation and anion exchange resins were found to be 1.25x10−2 and 1.51x10−2 s−1, respectively, at 650°C and u B of 5.45x10−2m.s−1.