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Inverse gas chromatography and XPS of extracted kraft pulps
Gamelas, José A.F.; Duarte, Gustavo V.; Ferreira, Paulo J.Kraft pulps at the kappa number level of 15 obtained from Acer saccharum (sugar maple) and Eucalyptus globulus prepared with and without hot water pre-extraction (HWE) were analysed by inverse gas chromatography (IGC) and X-ray photoelectron spectroscopy (XPS). In the case of A. saccharum pulps, the dispersive component of the surface energy (γsd) at 40ºC determined by IGC was 39.8 mJ m-2 (control pulp without ...
Effect of Hot Water Extraction on Hardwood Kraft Pulp fibers (Acer saccharum, S...
Duarte, Gustavo V.; Ramarao, Bandaru V.; Amidon, Thomas E.; Ferreira, Paulo T.This study focuses on the properties of fibers obtained from the kraft pulping of pre-extracted sugar maple wood chips. Hot-water pre-extraction was carried out for different times characterized by P-factors in the range of 12 and 600 h. It was found that pre-extraction of the chips significantly accelerates delignification during Kraft pulping such that the H-factors necessary to obtain equivalent delignificat...
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