OZONATION OF AQUEOUS-SOLUTIONS OF RESORCINOL AND PHLOROGLUCINOL .1. STOICHIOMETRY AND ABSORPTION KINETIC REGIME

In the first part of this work, chlorination of diluted aqueous solutions of resorcinol and phloroglucinol in the presence of bromide ion with and without preozonation has been carried out. The results obtained show that both phenols are strong trihalomethane precursors and that preozonation considerably reduces the formation of these organohalogen compounds. Subsequently, ozonation of resorcinol and phloroglucinol in an agitated tank has been conducted at different experimental conditions. The stoichiometry of the main reaction has been found to be 2 and 1.5 mol of ozone/mol of resorcinol and phloroglucinol, respectively. By applying film theory, the results obtained indicate that the ozone-phenol gas-liquid reactions studied are fast, taking place near the gas-liquid interface, and for some cases the system behaves as if one fast pseudo-first-order irreversible reaction develops in the water. From the reaction rate constants obtained, a comparison is made between the kinetic absorption of ozone in aqueous solutions of these phenols and that of a natural fulvic acid presented in a previous work by Croue et al. © 1990, American Chemical Society. All rights reserved.