Abstract
The kinetics of reaction of a lignin model compound, acetovanillone (4′‐hydroxy‐3′‐methoxyacetophenone), in tetraacetylethylenediamine (TAED)/H2O2 and peroxide‐alone systems were investigated. The oxidation of acetovanillone followed first‐order kinetics in both systems. In the TAED‐peroxide system, the first‐order rate constant, k, was 0.34 min−1 with a half‐life, t 1/2, of 2 min, compared to k of 0.0035 min−1 and t 1/2 of 220 min in the peroxide‐alone system. Thus, TAED/H2O2 oxidized acetovanillone about one hundred times faster than peroxide alone. The results of the study explain why, when using TAED/H2O2 to bleach TMP softwood pulp, the initial pH should be about 11 for increased production of peroxyacetic acid, and the final pH should be about 7 to minimize decomposition and increase bleaching efficiency and reactivity.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
