H factor pulping

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August undefined, 2024

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 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 …

Pulp and paper industry: An overview on pulping technologies, …

WebAn H-factor of 1 represents the effect of pulping for 1 h at 100 °C, while cooking for 1 h at 171 °C will change the H-factor to 1000 (RYDHOLM, 1965). The H-factor is a useful process control tool for Kraft pulp mills. Even the most modern plants use this parameter to control the pulp delignification rate, which is expressed as the kappa number WebSep 18, 2024 · During an endodontic treatment, bacteria and infected pulp tissue are removed from the root canal of a tooth that has developed apical periodontitis due to caries, trauma or iatrogenic damage [1,2].This is done by a combination of mechanical debridement using endodontic files and chemical irrigation using mostly sodium hypochlorite (NaOCl) … footie freeze cortland ny

Preparation of high-grade dissolving pulp from radiata

WebA mathematical model for neutral sulfite pulping process was derived. This model represented by a linear logarithmic relationship of the main pulping characteristics (yield and lignin content) to time and temperature parameters, both determined by the H-factor, is expressed by a logarithmic straight line equation. The relationship of yield to lignin … WebJul 23, 2024 · Maintain ideal levels in kraft pulping, from the digester to the recovery cycle This strategy attempts to model the relationship between Kappa number, H-factor (cooking temperature and cooking time), sulphidity, liquor-to-wood ratio and alkali charge (i.e. cooking control variables). 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 … footie girl

The influence of P-factor on pre-hydrolysis and ... - ResearchGate

H-factor - Negapedia

WebAug 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 … WebThis study compared mild pre-hydrolysis (140 °C) kraft pulping with conventional kraft pulping of commercial softwood chips at two H -factors for wood chips with thickness ranging from less than 2 mm to over 6 mm. The chip thickness less than 2 mm increased hemicelluloses oligomer yield and showed little influence on pulp fiber yield. footieheadWebFeb 9, 2024 · To isolate chemically pure cellulose from natural sources, two main industrial pulping methods are applied, such as sulfite and kraft processes accompanied by multi-stage bleaching [4, 5].... elevate lutherie

"WebMar 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. " - H factor pulping

H factor pulping

Effectiveness of the H-factor for Controlling Eucalyptus …

http://jultika.oulu.fi/files/isbn9514275004.pdf WebMay 1, 2024 · The pulp and paper sector currently plays important part in the world's economy. In this paper, we present a review of pulping technologies to convert logs or …

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WebPulping trials were conducted under the operating conditions varied over the following ranges: 7600, 15500 and 23400 G-factor level, 14%, 18% and 22% active alkali charge and … Weband 92.2% respectively. H-factor level and the active alkali charge are the most strongly in ﬂ ucing all the dependent variables. In order to obtain acceptable levels of the pulp properties, high sulphidity rate (45 %), medium H-factor (1600) and medium alkali concentration (18 %) can be used in kraft pulping of Anatolian Black Pine woods.

WebJun 26, 2024 · The H-factor describes the rate of delignification Search Google with "Kraft pulping","H-factor" Last edited by a moderator: May 2, 2024 Suggested for: Kraft Pulping - … 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 …

WebMay 1, 2024 · The pulp and paper sector currently plays important part in the world's economy. In this paper, we present a review of pulping technologies to convert logs or wood chips and non-woody materials into pulp for use in papermaking which consist of mechanical, chemical and semi-mechanical. WebDownload The H Factor full books in PDF, epub, and Kindle. Read online free The H Factor ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. The H Factor. Author: L. E. Indianer: Publisher: AuthorHouse: Total Pages: 302: Release: 2011: ISBN-10: 9781456719722: ISBN-13: 1456719726:

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

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). elevate long beach apartmentsWebMay 16, 2024 · Depending on the fiber type, chemical pulping can be conducted in either a 25-liter vertical batch digester, a 25-liter rotating digester, a 500-liter Continuously Stirred Tank Reactor (CSTR) or a 2500-liter vertical batch digester. Each digester is computer controlled to allow precise temperature ramps and controlled H-factor pulping. elevate lounge yorktownWebFeb 9, 2024 · The H-factor, pulp yield, residual effective alkali (REA), and solids content of black liquor for pine, acacia, sweetgum, and eucalyptus. Overall, longer cooks (higher H-factor) yielded less pulp and the black liquor samples showed lower REA levels and higher solid contents, which was expected. elevate lounge downtown laWebH-factor is a kinetic model for the rate of delignification in kraft pulping. It is a single variable model combining temperature ( T ) and time ( t ) and assuming that the delignification is … footie infant customWebB. Calculation of the H-factor. The 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. The greater value of H-factor level implies the more severe intense kraft cooking condition, and vice versa. footie goalsWebH-factor is a kinetic model for the rate of delignification in kraft pulping. It is a single variable model combining temperature ( T) and time ( t) and assuming that the … elevate luthieryWebOct 1, 2024 · Vroom used the H-factor to combine the pulping time and temperature into a single variable that represents the extent of cooking in a batch digester. In reality, the … elevate lutherie tools