Thermochemical Conversion of Cellulose and Hemicellulose

Nguyen, Anh Quynh; Trinh, Ly Thi Phi

doi:10.1007/978-3-031-05835-6_6

Cited by 2 publications

(1 citation statement)

References 122 publications

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“…Both the main chain and side chains contain hydrophilic groups, which are the components within wood with the highest moisture absorption capacity, consequently being the primary factor behind wood's moisture absorption and expansion (Rao et al 2023). During thermal treatment, hemicellulose within the wood decomposes to form substances like formaldehyde and furfural (Nguyen and Trinh 2022), which exhibit lower water absorption capabilities compared to cellulose. This results in improved dimensional stability of the wood after thermal treatment.…”

Section: Dimensional Stabilitymentioning

confidence: 99%

Effect of Urea-High-Temperature Combined Treatment on the Dimensional Stability of Densified Fast-Growing Wood

Wang,

Wei,

Wang

et al. 2024

Preprint

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Due to the continuous depletion of timber resources and the increasing ecological awareness among people, large-scale fast-growing artificial forests have become a key solution to address the imbalance between timber supply and demand. In recent years, the problem of low density and mechanical strength of fast-growing timber has been addressed through timber densification. However, densified timber still faces issues such as high moisture absorption and poor dimensional stability. Urea molecules can expand the volume of the non-crystalline region of cellulose to protect the cell wall structure of timber from damage during the densification process. In this paper, an effective modification strategy was proposed to prepare lightweight high-strength wood through the synergistic effect of urea vacuum impregnation treatment and high temperature densification, which solved the problem of poor dimensional stability of densified wood. Research results indicate that when the concentration of urea solution is at 50%, the maximum weight gain of the timber samples reaches 17.76%. After densification treatment, the absolute dry density of the test samples increased by more than 0.031g/cm3. Timber treated with a 50% urea solution and processed at 170°C demonstrates good dimensional stability, with a radial swelling rate of only 0.79% under a relative humidity of 65%. Therefore, the joint modification of wood using urea and high-temperature treatment is an effective and environmentally friendly method, presenting broad prospects for development.

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Section: Dimensional Stabilitymentioning

confidence: 99%

Effect of Urea-High-Temperature Combined Treatment on the Dimensional Stability of Densified Fast-Growing Wood

Wang,

Wei,

Wang

et al. 2024

Preprint

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The Effects of Autohydrolysis Pretreatment on the Properties of OPT Pulps for the Production of Dissolving Pulp

Joseph,

Mohamad Kassim,

Ibrahim

et al. 2024

JST

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This preliminary study investigated an environmentally friendly method for fabricating cellulose-rich dissolving pulp from Oil Palm (<i>Elaeis guineensis</i>) Trunk (VBOPT) fibre. This method encompassed an autohydrolysis pretreatment followed by soda pulping procedures. The impact of autohydrolysis pretreatment on the separation of lignocellulosic components was scrutinised to facilitate the production of chemical cellulose. Autohydrolysis was performed on VBOPT fibre for 60 min at temperatures ranging from 140°C to 160°C, maintaining a solid-to-liquid ratio of 1:8. The yield of the prehydrolysed OPT varied between 73.5% and 91.5%. The chemical composition of the prehydrolysed VBOPT fibre comprised 70.6–80.0% holocellulose, 63.7–87.1% α-cellulose, 7.4–10.9% ß-cellulose, 5.5–25.4% γ-cellulose, and 21.5–26.6% lignin. The prehydrolysed OPT was subsequently subjected to alkaline pulping under fixed conditions: a temperature of 160°C, a treatment time of 60 min, a chemical charge of 25%, and a solid-to-liquid ratio of 1:6. The resultant pulp exhibited properties such as a screening yield of 41.5–46.4%, a kappa number of 4.5–9.6, and α, β, and γ cellulose content of 89.4– 98.1%, 1.5–5.3%, and 0.4–6.9%, respectively. Based on the chemical composition of the OPT biomass before and after pretreatment, as well as post-alkaline cooking, the autohydrolysis pretreatment was determined to significantly influence the resultant pulp. A more comprehensive understanding of the interdependence of autohydrolysis and pulping processes can be achieved by executing an optimisation study focusing on key parameters of autohydrolysis and pulping, including temperature, treatment duration, and chemical charge.

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Thermochemical Conversion of Cellulose and Hemicellulose

Cited by 2 publications

References 122 publications

Effect of Urea-High-Temperature Combined Treatment on the Dimensional Stability of Densified Fast-Growing Wood

Effect of Urea-High-Temperature Combined Treatment on the Dimensional Stability of Densified Fast-Growing Wood

The Effects of Autohydrolysis Pretreatment on the Properties of OPT Pulps for the Production of Dissolving Pulp

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