Journal
BIORESOURCE TECHNOLOGY
Volume 100, Issue 20, Pages 4731-4735Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2009.04.052
Keywords
Miscanthus x giganteus; Acetosolv; Bleaching; Modelling; Chelating agents
Funding
- Xunta de Galicia [PGIDIT04RFO2659912PR]
- University of A Coruna
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Miscanthus x giganteus bark samples subjected to fractionation by the Acetosolv process under optimal conditions were bleached Using hydrogen peroxide and acetic acid in aqueous media under alkaline conditions. The influence of the main operational variables in the bleaching of Acetosolv Pulps of M. x giganteus (i.e. hydrogen peroxide concentration, 3-7%: temperature, 55-75 degrees C; pH 9-11), obtained after treatments, have been assessed on pulp yield, kappa number, viscosity and brightness of bleached Pulps. For this purpose, a rotatable and orthogonal second-order factorial design of experiments Was used, in order to identify the optimum operating conditions. The obtained empirical mathematical models demonstrate that, in general, the bleaching was efficient, achieving pulps with kappa numbers below 10. The chemical composition and physicochemical properties of the bleached pulps fulfilled the requirements for forthcoming bleaching stages. Moreover, an alkaline extraction stage to eliminate saponifiable groups of Acetosolv pulps Was Studied, as well as the necessity of use chelating agents in the stage with hydrogen peroxide. (C) 2009 Elsevier Ltd. All rights reserved.
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