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Characterization of Eucalitptus grandis kraft pulps treated with phosphonates i...
Area, Maria Cristina; Felissia, Fernando E.; Carvalho, M. Graça V. S.; Ferreira, Paulo J.; Barboza, Olga M.; Bengoechea, Dora I.
Data: 2011
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Origem: Estudo Geral - Universidade de Coimbra
ECF bleaching with a final hydrogen peroxide stage: Impact of the chemical comp...
Loureiro, Pedro E. G.; Domingues, Eva F.; Evtuguin, Dmitry V.; Carvalho, M. Graça V. S.Two industrial elemental chlorine free (ECF) bleaching sequences, D0(EOP)D1(EP)D2 and OQ(PO)DP, are compared with respect to the bulk content of lignin, carboxyl, hexeneuronic acids (HexA), and reducing groups after each bleaching stage. HexA groups contribute significantly to the total content of carboxyl groups, and their degradation during chlorine dioxide bleaching is reflected by a decrease of the carboxyl...
Data: 2010
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Origem: Estudo Geral - Universidade de Coimbra
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