The kinetics of the reaction of acetic acid with hydrogen peroxide, leading to peroxyacetic acid, were studied at various molar reactant ratios (AcOH3H 2 O 2 from 6 : 1 to 1 : 6) at 20, 40, and 60oC and sulfuric acid (catalyst) concentrations of 0 to 9 wt %. The reaction is reversible, and the equilibrium constant decreases as the temperature rises: K = 2.10 (20oC), 1.46 (40oC), 1.07 (60oC); D r H 0 = 313.7 + 0.1 kJ mol !1 , D r S = 340.5 + 0.4 J mol !1 K !1 . The maximal equilibrium concentration of peroxyacetic acid (2.3 M) is attained at 20oC and a molar AcOH-to-H 2 O 2 ratio of 2.5 : 1. The rate constants of both forward and reverse reactions increase with increase in sulfuric acid concentration from 0 to 5 wt %. Further raising the catalyst concentration does not affect the reaction rate. The reaction mechanism is discussed.
Data available in the scientific research and patent literature on the structure and application of polysaccharide complexes with metal cations are reviewed for the period 1990 -2005.
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