Resumo

KUNIGK, L. et al. Influence of temperature and pH on the decomposition kinetics of peracetic acid in aqueous solutions. Lat. Am. appl. res. [online]. 2014, vol.44, n.3, pp. 195-201. ISSN 1851-8796.

Peracetic acid (PAA) is a strong oxidant used by the food industry as a sanitizer, in medical area as a disinfectant and by the textiles and paper industries as a bleacher. Its decomposition rate is an important parameter in these applications. The main purpose of this paper is to study the decomposition kinetics of PAA between 25 and 45 °C in solutions with pH 3.11, 5.0 and 7.0. The decomposition of PAA is a first-order reaction for all solutions and temperatures studied. The rate constants were between 2.08⋅10^-3 and 9.44⋅10^-3 h^-1 (pH 3.11), between 2.61⋅10^-3 and 16.69⋅10^-3 h^-1 (pH 5.0) and between 7.50⋅10^-3 and 47.63⋅10^-3 h^-1 (pH 7.0). The activation energy of PAA decomposition in aqueous solutions are 58.36 and 72.89 kJ⋅mol^-1 when pH was 3.11 and 5.0, respectively

Palavras-chave : Peracetic Acid; Decomposition Kinetics; Temperature; PH.