1995
DOI: 10.1007/bf00195266
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Kinetics of polysaccharide hydrolysis in the acid-catalysed delignification of eucalyptus globulus wood by acetic acid

Abstract: Summary The kinetics of HCl-catalysed delignification of Eucalyptus globulus wood by 70% (w/w) acetic acid solution were satisfactorily explained by a model in which 5% of the lignin fraction could not be eliminated and the remaining 95% was eliminated by a single process which, in view of the activation energy calculated from the data was attributed to the hydrolysis of ct-aryl ether bonds. The selectivity of the process was effectively independent of HC1 concentration and operating temperature for pulp yield… Show more

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Cited by 21 publications
(19 citation statements)
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“…For example, researchers had conducted studies on Pinus pinaster (Vázquez et al 1995) and Pinus sylvestris (Nimz et al 1984), and recommended a concentration of 90% acetic acid for the delignification of pine wood and pointed out the significant effect of lignin condensation. The hardwoods that had been investigated include Fagus sylvatica (Nimz et al 1984), Eucalyptus globulus (Vázquez 1995, Dapia et al 2003, and aspen (Populus tremula x Populus tremuloides) (Dapia et al 2003). Significant lignin condensation and precipitation at high temperature (160 ºC) were also observed in these works.…”
Section: Introductionmentioning
confidence: 99%
“…For example, researchers had conducted studies on Pinus pinaster (Vázquez et al 1995) and Pinus sylvestris (Nimz et al 1984), and recommended a concentration of 90% acetic acid for the delignification of pine wood and pointed out the significant effect of lignin condensation. The hardwoods that had been investigated include Fagus sylvatica (Nimz et al 1984), Eucalyptus globulus (Vázquez 1995, Dapia et al 2003, and aspen (Populus tremula x Populus tremuloides) (Dapia et al 2003). Significant lignin condensation and precipitation at high temperature (160 ºC) were also observed in these works.…”
Section: Introductionmentioning
confidence: 99%
“…This can be confirmed when the activation energy values obtained here are compared to certain results reported in literature. The activation energy published for the faster hydrolysis kinetics of the acetic acid-water pulping, is in the range 84-88 kJ.mol -1 [19,[25][26][27]. However, when small amounts of hydrochloric acid are added, the activation energy dramatically drops.…”
Section: Extraction Of Polysaccharidesmentioning
confidence: 99%
“…On the other hand, very good selectivity is observed in the pulp yield range of 75 -50%. Autocatalysed, organosolv pulping processes tend to be more selective than conventional processes [1], but external addition of acid leads to extended polysaccharide degradation, and consequently, low selectivity [19]. An interesting way of improving the extraction selectivity is by coupling an organic solvent and supercritical carbon dioxide [20,21].…”
Section: Introductionmentioning
confidence: 99%
See 1 more Smart Citation
“…The most usual approach is to assume that the different lignin species react consecutively according to first-order kinetics. In the several species of lignin approach, the different phases observed during delignification correspond to changes in the mechanism that controls the reaction rate of the overall process (Parajó et al, 1995;Vázquez et al, 1995). The chemical kinetics of alkaline pretreatment processes have been demonstrated in the scientific literature (Kleinert, 1966;Kim and Holtzapple, 2006).…”
Section: Introductionmentioning
confidence: 99%