Modeling of Delignification Process of Activated Wood and Equipment for its Implementation

Просвирников, Д. Б.; Сафин, Р. Г.; Зиатдинова, Д. Ф.; Тимербаев, Н. Ф.; Sadrtdinov, A.

doi:10.1088/1757-899x/221/1/012009

Cited by 23 publications

(11 citation statements)

References 32 publications

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“…Steam treatment also affects the resulting delignification results, according to Prosvirnikov, et al (2017) active lignocellulosic materials, react faster at higher temperatures and steam treatment makes a state of high humidity facilitating accelerated saturation of the liquid into the interior. particles, then the lignin destruction reaction starts first about 1.5 -2 times faster [11].…”

Section: A Analysis Of the Effect Of Delignification And Bleaching On...mentioning

confidence: 98%

“…The increase in temperature causes thermal softening of the lignin polymer, causing an increase in lignin depolymerization in an acidic or alkaline environment [10]. Pulp treated with bleaching has a high level of brightness because the addition of bleaching increases the accessibility of chemicals in the form of bleach to the pulp and allows the removal of less degraded lignin [11]. Treatment with alkali can cause thinning or reduction in the structure of the fiber followed by the breaking of fiber bonds.…”

Section: Analysis Of the Effect Of Delignification And Bleaching On P...mentioning

confidence: 99%

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Effect of Steam Delignification and Bleaching Process on Pineapple Leaf Fiber as Textile Raw Material

Triastuti,

Suprapto,

Surono

et al. 2023

IJOE

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Pineapple is a local commodity in Indonesia that is widely cultivated. The part of the pineapple plant that is mostly used is only the fruit part, while the other plant parts are discarded and become waste. Pineapple leaves contain high fiber content of cellulose, lignin, and hemicellulose, so it has very potential if used as an alternative textile raw material. The quality of pineapple leaf fiber can be improved by going through a delignification process using an alkaline solvent with the appropriate concentration and time. This research determine the effect of delignification of pineapple leaf fiber with a solution of Sodium Hydroxide (NaOH), Hydrogen Peroxide (H2O2) and water (H2O) on tensile strength, lignin content and SEM Analysis. This research consists of six stages including delignification using NaOH and H2O2, washing, neutralization, and analysis of pineapple leaf fiber products. The results obtained are pineapple leaf fiber lignin test after delignification and bleaching, the best lignin results are steam delignification at 80°C with 3% NaOH solution and bleaching solution using NaOCl solution obtained 21% lignin content with a tensile strength test of 0,263 kgf/mm 2 . SEM analysis also showed that there was a loss of material from the fiber surface indicated there was degradation.

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Section: A Analysis Of the Effect Of Delignification And Bleaching On...mentioning

confidence: 98%

Section: Analysis Of the Effect Of Delignification And Bleaching On P...mentioning

confidence: 99%

Effect of Steam Delignification and Bleaching Process on Pineapple Leaf Fiber as Textile Raw Material

Triastuti,

Suprapto,

Surono

et al. 2023

IJOE

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“…В результате тепловой, механической и/или химической обработки механические свойства цельной древесины могут быть приведены в соответствие с требованиями, предъявляемыми к материалу готового изделия из нее. Изучению возможности применения методов термомеханической и химико-механической модификации древесины посвящено множество работ [1-7, 9, 10, 24, 25], актуальных и в наши дни [19,20,[36][37][38][39].…”

Section: Introductionunclassified

Physical and Mechanical Characteristics of a Pine Thermowood Composition during Barothermal Treatment

Skurydin¹,

Skurydina²,

Сафин³

et al. 2021

Lesnoy Zhurnal (Forestry Journal)

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The studies are aimed at forming ideas on the structure and properties of composite materials obtained from pine wood and the processes occurring in the structure of wood tissue. The article presents the data on the influence of the conditions of barothermal treatment of pine wood samples by the method of explosive autohydrolysis on the properties of a thermowood composition. The composite material is obtained by hot pressing. The influence on density, strength and hydrophobic characteristics was studied. A series of samples was made under different conditions of the explosive autohydrolysis rigidity factor; at a temperature of 200 °C and the process duration from 0.08 to 10 min. All samples of composite material were obtained without the use of additional components. It was found that the increase in the hydrolysis rigidity factor leads to a decrease in the density of hydrolyzed wood from 440 to ~350 kg/m3. There is no fragmentation of wood samples with the selected processing parameters. Hot pressing of hydrolyzed wood obtained under conditions of low or moderate rigidity is accompanied by a linear increase in the density of the thermowood composite material from ~440 to 500 kg/m3. The consequence of a further increase in the rigidity factor is a slowdown in the rate of increase in the density of the composite material. The conditional boundary that determines the achievement of the maximum number of cross-linked intermolecular structures in the composite material corresponds to the rigidity factor of 3000–4500 min. More rigid processing conditions cause intensification of thermal degradation processes. The dependence of hydrophobic characteristics on the rigidity of the barothermal treatment conditions is complex. At the rigidity factor of 1000–3000 min, an extreme point is observed, before which the hydrophobic properties of the material deteriorate. Its water absorption and swelling increase from 50 to 130 % and from 15 to 54 %, respectively. The hydrophobic performance is significantly improved after reaching the extreme point. Water absorption and swelling reduce to ~20 % and ~10 %, respectively. Mild hydrolysis conditions do not result in a material with consistently high hydrophobic properties. The cross-linked structures are not enough to form a strong and water-resistant composition, and as a consequence, the hydrophobic characteristics deteriorate. Increasing the value of the hydrolysis rigidity factor increases the number of active components. Additional intermolecular bonds formed during pressing improve hydrophobic characteristics. The obtained results can be used in the creation of models of processes occurring in the structure of lignocellulose substance during explosive autohydrolysis and in the preparation of composite materials based on it. Optimal parameters of barothermal treatment for obtaining composite materials with specified physical and mechanical characteristics can be determined. Barothermal treatment of solid pine wood by explosive autohydrolysis contributes to the occurrence of chemically active components in the structure of wood tissue. Their number depends on the rigidity of the processing conditions. The properties of the resulting thermowood composition depend on the conditions of explosive autohydrolysis.

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“…Operational characteristics, in particular, the service life is not more than five-seven years, which causes significant economic damage in the maintenance of railways. Modern utilization of used wooden ties causes significant environmental damage to the environment [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Composite Railroad Ties Obtained by the Energy Efficient Recycle of Wooden Railroad Ties

Stepanov

Тимербаев

2018

SSP

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The article presents the result of research in the field of processing wooden railroad ties and thermoplastic polymer household waste with obtaining composite railroad ties under conditions of energy efficiency of technological processes. The wood of the used wooden ties contains a significant proportion of chemical compounds based on creosote. As a result of the thermal and mechanical action, the creosote compounds in the wood form hydrophobic surfaces, thereby fulfilling the function of the bonding additives. Under the above-mentioned conditions, hydrogen bonds are formed between the components of the wood composite, that, in its turn, allows achieving the task of creating a functional composite, which varies in the compound of elements and the modes of production processes. Experimental studies were held on the nature of justification and correction of theoretical studies. The experimental stand of composite production is realized on the principle of energy efficient cooling cycles of the obtained composite with heat transfer for heating the initial components. The obtained results of experimental studies exceed the regulation values by every measure. The comparison justifies the quality of the experimental samples obtained with respect to these values.

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Modeling of Delignification Process of Activated Wood and Equipment for its Implementation

Cited by 23 publications

References 32 publications

Effect of Steam Delignification and Bleaching Process on Pineapple Leaf Fiber as Textile Raw Material

Effect of Steam Delignification and Bleaching Process on Pineapple Leaf Fiber as Textile Raw Material

Physical and Mechanical Characteristics of a Pine Thermowood Composition during Barothermal Treatment

Composite Railroad Ties Obtained by the Energy Efficient Recycle of Wooden Railroad Ties

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