DELIGNIFICATION OF EUCALYPTUS-GLOBULUS WOOD BY ETHANOL WATER SOLUTIONS IN BATCH AND FLOW-THROUGH-REACTOR - EFFECT OF PRESSURIZED OXYGEN ADDITION

resumo

We have studied the delignification of E. globulus wood by water-ethanol mixtures (50:50, V/V) at 160-degrees-C, without any chemical additive. In the absence of oxygen, the best results were obtained by percolation of liquor in flow-through-reactor or with higher liquor-to-wood ratios (> 10) in batch cookings; but delignification is always limited. In the presence of oxygen under pressure (15 bar at 25-degrees-C), a net increase was observed in both the reaction kinetics and degree of delignification. For well delignified pulps, the yields remain satisfactory; nevertheless, DPBAR values were low as a consequence of the fiber degradation by oxygen. The mechanisms of delignification are discussed and reaction pathways are proposed.

palavras-chave

PULP PROPERTIES; KINETICS

categoria

Forestry; Materials Science

autores

NETO, CP; ROBERT, A

nossos autores

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