H factor pulping
WebOne of the most used models in pulp prediction is the H-factor developed by K.E. Vroom (1957). The model, involving time and temperature, describes how the lignin content in the wood residue is reduced as the cooking proceeds. In much the same way the G-factor describes the cellulose degradation (Theliander et. al., 2002).
H factor pulping
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WebAnthraquinone and Polysulfide - Applicability foe Use in Pulp Mill Operations / 253 Deal, H., TAPPI 1996 Pulping Conference Proceedings , TAPPI PRESS, Atlanta, p. 73 Sulfide Profiling for Increased Kraft Pulping Selectivity / 261 Jiang, J.E. and Herschmiller, D.W., TAPPI 1996 Pulping Conference Proceedings, TAPPI PRESS, Atlanta, p.311 WebVroom, K. E. 1957: The H factor: a means of expressing cooking times and temperatures as a single variable. Pulp Paper Mag. Can. 58(C): 228–231. Google Scholar Yorston, F. H.; Liebergott, N. 1965: Correlation of the rate of sulphite pulping with temperature and pressure. Further studies. Pulp Paper Mag. Canada 66: T272-T278, (1965)
WebThe pulping process being employed utilizes both the liberated fibers obtained from the kraft cook and the reject material retained after screening (Hart et al. 2008a). Therefore, the … WebNov 14, 2014 · Kraft Pulping KineticsDerivation of “H” Factor (4) Equation 10 can be substituted into equation 2 leaving: (11) ƒ k dt = p ƒ kr dt (p is a constant) The expression ƒ kr dt is referred to as the “H” factor: (12) H = ƒ kr dt By combining equations 2, 11, and 12, it can be seen that the extent to which a pulping reaction has proceeded ...
WebThe H-factor is a pulping variable that combines cooking temperature and time into a single variable that indicates the extent of reaction. Although different temperatures might be … WebThe pulping results are shown in Table 4. For an increase in delignification level (kappa reduction), a raising of the alkali charge and also of the H factor were necessary. In this work, the rise in the H factor was achieved by increasing the maximum cooking temperature, while the time was the same in all experiments.
WebApr 26, 2024 · study of kraft pulping kinetics was presented by Vroom.10 He implemented the concept “H-factor” that combines the pulping temperature and time as a single …
WebOct 1, 2024 · In this article, a comprehensive review in the area of modeling, control and diagnostics of continuous pulp digesters is conducted. The evolution of research focus within these areas is followed and discussed. Particular effort has been devoted to identifying the state-of-the-art and the research gap in a summarized way. fidesz körmend belépésWebpulping is to remove enough lignin so that the fibres are free and give them the required characteristics at the lowest possible cost. Two processes dominate chemical pulping: … fidesz korrupciós listaWebAug 22, 2012 · Higher pulp yields were associated with lower Kappa numbers and alkali consumption, suggesting the important role of chemical composition of wood on kraft cooking. The results confirm the high pulping potential of Acacia melanoxylon trees grown in Portugal and suggest the possibility of tree selection using both wood density and pulp … hr bau marklkofenWebThe brief results of calculating the H-factor as a means of expressing cooking temperature and time duration as a single variable during the kraft pulping are presented in Table 2. … hr barcampWebThe H-factor is based on the Arrhenius equation and uses the activation energy of bulk delignification of softwood. The use of H-factors makes it possible to control the cooking … fidesz kormányzásaWebMar 16, 2024 · A wood chip classifier system is a must management decision in a modern kraft pulp mill. An increase of pulp yield of one per cent for a 1,000 TPD mill will allow using almost 17,000 tons less o.d. wood. This savings can equate around a million dollars or more a year, depending on the wood chip costs. hr barber kinarutWebMay 1, 2001 · To reduce the calculation errors, combining the processing mechanism of H-Factor was calculated in a phased way effective cooking temperature, avoiding the wrong … hr baterias