Oxidative delignification: The roles of lignin reactivity and accessibility

This study compared oxidative delignification of birch kraft pulp fibers to from acid hydrotropic fractionation (AHF) using p-toluenesulfonic (p-TsOH). Under oxygen at 20% consistency, AHF pulps with lower hemicellulose content showed higher than similar lignin despite its residual (cellulosic enzymatic lignin, CEL) being less reactive fewer ?-O-4 ether aryl linkages based on 2D13C-1H nuclear magnetic resonance (NMR) spectroscopy. The water retention value (WRV) fibers, a measure fiber accessibility or chemicals, was substantially greater that fibers. Similar comparison various further suggested were easier delignify (bleach) having more reactivity (fewer linkages). Additionally, the present also indicated effective high which can be attributed thinner films surfaces loadings. These results mass transfer rate controlling process in wood