Achieving Major Increases in Hardwood Yield with Lo-SolidsTM Cooking: A Study in Progress.

Marcoccia, Bruno; Stromberg, Bertil; Progh, James Robert; Kawakami, Chiaki

doi:10.2524/jtappij.52.458

Cited by 5 publications

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“…This made it possible to predict pulping yield with a mean Brought to you by | University of Georgia Libraries Authenticated Download Date | 6/9/15 9:03 PM The prediction of pulp yield using selected fiber properties 479 error of 0.89% (Figure 4). It is argued in the literature that the yield-coarseness relationship must be a direct proportionality and therefore must have zero intercept (Marcoccia 1998). Therefore, the correlation was also tested for zero intercept.…”

Section: Resultsmentioning

confidence: 99%

The prediction of pulp yield using selected fiber properties

2005

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The present study is dealing with the question how the major yield-controlling components in pulp (i.e., hemicelluloses and lignin) alter the behavior and/or properties (e.g., dimensions, flexibility, sugar content) of the fibers. The hypothesis should be verified that certain fiber properties can be used as marker for yield information. Pine and maple wood were digested under specific conditions to produce unbleached pulps with two different lignin contents per method. Screened pulps were chemically analyzed using a new NMR technique for carbohydrates, and the fibers were fractionated using a modified Bauer McNett classification. Pulp yields were related to the pulping methods in the sequence: polysulfide)kraft)biokraft)soda. Carbohydrate analysis revealed that the glucose content (glucose method) was related to the pulping yield. Certain fiber properties (fiber width and coarseness measured directly from the screened pulps) also provided close correlations with the pulp yield. The arithmetic average fiber length and width of the R 14 Bauer McNett screen was a significant predictor of yield at the 95% confidence level, with a mean error of 0.43%.

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Section: Resultsmentioning

confidence: 99%

The prediction of pulp yield using selected fiber properties

2005

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“…Based on the empirical work of Marcoccia et al (1998a, b), van Heiningen and co-workers at University of Maine (USA) proposed a theoretical equation for the prediction of alkaline pulp yield (van Heiningen et al 2004) The basis for this work was to consider cellulose, a homopolymer subjected to well-known degradation kinetics during alkaline pulping, as a ''tracer'' substance in the mass balance during the conversion of wood into pulp. In other words, the change in cellulose mass fraction based on the initial wood mass is described based on alkaline pulping theory.…”

Section: Theorymentioning

confidence: 99%

Prediction of alkaline pulping yield: equation derivation and validation

Perez

Heiningen

2015

Cellulose

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A method is described which allows prediction of alkaline pulp yield. It is based on an equation which relates the pulp yield to the cellulose content and cellulose degree of polymerization of the alkaline pulp. From the slope and intercept of this linear equation, the lignin-free pulp yield, Y 0 T , of a pulp sample can be calculated when the lignin-free cellulose content (G 0 ) and the cellulose degree of polymerization (DP) of the pulp fiber are determined by sugar analysis and viscosimetry, respectively. In this paper the yield prediction equation is derived and validated using model celluloses and hemicelluloses. As part of the yield prediction method, a new equation was developed which corrects the cellulose degree of polymerisation obtained from the pulp intrinsic viscosity for the hemicellulose content of the pulp. The approach was successfully validated by cooking of cotton at different temperatures (160-180°C), alkalinities (1.30-2.60 mol/L, the equivalent to an effective alkali (as Na 2 O) charge of 12-24 % at a L/W ratio of 4.0 L/kg), sulfidities (15 and 30 %) and anthraquinone charges (0, 0.05 and 0.1 %). The cellulose protecting effect of AQ was confirmed by the lower number of glucose units removed by alkaline peeling compared to that removed during conventional alkaline or kraft cooking. Keywords Cellulose degree of polymerization Á Cotton Á Alkaline pulping Á Pulp yield Á Theoretical derivation Abbreviations AQ Anthraquinone CED Cupriethylenediamine DMAC-Li Dimethylacetamide/lithium chloride HPAEC-PAD High performance anion exchange chromatography equipped with pulsed amperometric detector MCC Microcrystalline cellulose MHS Mark-Houwink-Sakurada equation MSA Metasaccharinic acid THF Tetrahydrofuran TOC Total organic carbon List of symbols DP Average cellulose degree of polymerization in pulp DP 0Average degree of polymerisation in wood G 0Lignin-free cellulose content of pulps TAPPI g Pulp viscosity measured according to TAPPI T 230 om-08 standard method

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“…Além dos benefícios citados anteriormente, várias fábricas observaram redução no consumo específico de madeira, o que é uma evidência do aumento de rendimento devido ao uso do processo Lo-Solids®. A redução do consumo de madeira é na ordem de 8%(MARCOCCIA, et al, 1998).Foram observadas em fábricas produtoras de polpas celulósicas de fibra longa, após a conversão do sistema de polpação kraft convencional para o modificado do tipo Lo-Solids®, aumento de 5 a 10% na resistência ao rasgo das polpas produzidas. Foi verificado que o aumento da resistência ao rasgo melhora com o aumento da concentração do álcali efetivo residual, como também a perda de rendimento pode ser evitada mantendo-se mais elevadas concentrações de álcali efetivo residual ao final do processo de polpação (MARCOCCIA;LAAKSO;MCCLAIN, 1996).Para realização deste trabalho, foram analisadas 5 árvores da espécie Pinus maximinoi e 5 árvores da espécie Pinus taeda, ambas com 14 anos de idade.…”

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Avaliação tecnológica da madeira de <i>Pinus maximinoi</i> visando sua utilização industrial na produção de celulose kraft

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Achieving Major Increases in Hardwood Yield with Lo-SolidsTM Cooking: A Study in Progress.

Cited by 5 publications

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The prediction of pulp yield using selected fiber properties

The prediction of pulp yield using selected fiber properties

Prediction of alkaline pulping yield: equation derivation and validation

Avaliação tecnológica da madeira de <i>Pinus maximinoi</i> visando sua utilização industrial na produção de celulose kraft

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