Optimization of Two-Step Alkali Process of Lignin Removal from Basswood

Wachter, Igor; Štefko, Tomáš; Rolinec, Marek

doi:10.2478/rput-2019-0016

Cited by 7 publications

(2 citation statements)

References 17 publications

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“…Owing to the chemical composition of the lignin, the nonwood fibres have to be pretreated before their utilization in the production of paper. Thus, the pretreatment is done mainly t chemical pulping process [45], where the tensile strength is weakened, while the tensile stiffness of the fibres remains intact [46]. The colour of the fibres during this process is, therefore, attributed to the presence of lignin [21].…”

Section: Ligninmentioning

confidence: 99%

Agricultural Residues as an Alternative Source of Fibre for the Production of Paper in Kenya-A Review

Otieno

Okumu

Adalla

et al. 2021

AJOCS

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The pulp and paper industry is primarily dependent on fibrous wood for pulp and paper production. However, this over-dependence on fibrous wood poses serious environmental challenges such as the diminishing of the fibrous wood stocks, deforestation, emission of greenhouse gases, and global warming. Therefore, to mitigate these environmental challenges associated with its utilization for paper and pulp production, other sustainable raw material sources can also be considered for the production of paper and pulp. There are enormous benefits associated with the utilization of non-wood fibres as an alternative and sustainable raw materials source for the production of paper and pulp. These benefits have in the recent past prompted millers in China, India, Brazil, and the USA to consider the utilization of non-wood fibres in paper and pulp production. In Kenya, the pulp and paper industry is very much dependent on fibrous wood for production and the industry is yet to fully embrace the utilization of nonwood fibres for paper and pulp production. Further, the dependence on fibrous wood has contributed significantly to the decline of paper pulp and paper production, deforestation, and rise in paper importations due to insufficient raw material supplies. The importation of paper and pulp products has further led to the collapse of the paper industry in Kenya. The sector stands a chance of revival and vibrancy through the utilization of the abundant agricultural residues and feedstocks lying in the agricultural fields across the country. Similar experiences elsewhere have proved that the abundance of agricultural waste can be utilized for the production of paper and pulp due to their excellent fibre content for specialty papers, and easy pulpability. The agricultural residues are therefore considered a quintessential alternative and sustainable source of raw materials for the pulp and paper industry. Moreover, their utilization will mitigate environmental impacts such as deforestation, climate change, and pollution .

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Section: Ligninmentioning

confidence: 99%

Agricultural Residues as an Alternative Source of Fibre for the Production of Paper in Kenya-A Review

Otieno

Okumu

Adalla

et al. 2021

AJOCS

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“…Both sodium compounds were found to reduce the density of wood by degrading hemicellulose and lignin, while leaving the cellulose intact (Wachter et al, 2019;Li et al, 2021). Compared to acids (i.e., H 2 SO 4 ), alkaline solutions do not damage the S2-layer, but loosen the middle lamella, where the largest proportion of hemicellulose resides especially, if combined with thermal treatments of 100°C and 120°C.…”

Section: Introductionmentioning

confidence: 98%

Modifying the radiation ratio of tonewoods through wood degradation

Nefdt,

Meincken

2024

Preprint

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This work investigates different wood modification techniques to modify the acoustical properties of tonewoods, in particular the sound radiation ratio (R). The treatments used were heat- and fungal exposure, as well as immersion into NaOH and Na2SO3 solution and a combination of the most successful treatments. All initial experiments were performed on pine (Pinus patula) due to cost factors, before replicating the best performing treatment on high quality spruce tonewood (Picea abies). The main objective was to reduce the hemicellulose content without severely degrading cellulose, which results in a reduction of density, while maintaining, or even improving the elasticity (MOEL), which results in an increase of R. Overall, the combined heat-fungal and heat-sodium treatments performed best and increased R by up to 20%. Sodium treatment led to the best increases in R, but compromised the wood structure in spruce and the treatment protocol needs to be developed further. Consequently, the most successful wood treatment to improve acoustical properties was determined to be exposure to white rot combined with heat treatment.

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