Effect of pulp prehydrolysis conditions on dissolution and regenerated cellulose pore structure

Koistinen, Antti; Phiri, Josphat; Kesari, Kavindra Kumar; Vuorinen, Tapani; Maloney, Thaddeus

doi:10.1007/s10570-023-05050-w

Cited by 9 publications

(5 citation statements)

References 47 publications

(50 reference statements)

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“…Cellulose is a linear polysaccharide consisting of 3000 or more glucose units linked by β-1,4-glycosidic bonds. There are multiple intramolecular and intermolecular hydrogen bonds in natural cellulose, resulting in poor accessibility for enzymes [24]. Therefore, most of the literature has applied microcrystalline cellulose (MCC) as the substrate, which is a kind of freely flowing powder particle with a degree of polymerization (DP) of 15-375 [25].…”

Section: Conversion Of Cellulose By Mof-immobilized Enzymementioning

confidence: 99%

Recent Progress on Conversion of Lignocellulosic Biomass by MOF-Immobilized Enzyme

Tao,

Song,

2024

Polymers

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The enzyme catalysis conversion of lignocellulosic biomass into valuable chemicals and fuels showed a bright outlook for replacing fossil resources. However, the high cost and easy deactivation of free enzymes restrict the conversion process. Immobilization of enzymes in metal–organic frameworks (MOFs) is one of the most promising strategies due to MOF materials’ tunable building units, multiple pore structures, and excellent biocompatibility. Also, MOFs are ideal support materials and could enhance the stability and reusability of enzymes. In this paper, recent progress on the conversion of cellulose, hemicellulose, and lignin by MOF-immobilized enzymes is extensively reviewed. This paper focuses on the immobilized enzyme performances and enzymatic mechanism. Finally, the challenges of the conversion of lignocellulosic biomass by MOF-immobilized enzyme are discussed.

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Section: Conversion Of Cellulose By Mof-immobilized Enzymementioning

confidence: 99%

Recent Progress on Conversion of Lignocellulosic Biomass by MOF-Immobilized Enzyme

Tao,

Song,

2024

Polymers

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“…Prehydrolysis results in a higher alpha-cellulose pulp than just Kraft pulping alone, which is ideal for the dissolving pulp stage. However, acid prehydrolysis can result in the hydrolysis of the alphacellulose, causing a decrease in DP, so careful monitoring is required to ensure higher yield pulps [71,90,91]. Additionally, under acidic conditions, lignin can self-condense or react with phenol, making it more difficult to remove lignin content (i.e., delignification) during the pulping process (i.e., cooking) [82].…”

Section: Pulping Processmentioning

confidence: 99%

Processes and Challenges for the Manufacturing of Lyocell Fibres with Alternative Agricultural Feedstocks

Lawson,

Ford,

Hoque

et al. 2023

Applied Sciences

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Lyocell man-made cellulosic fibres (L-MMCF) have been commercially available since the mid-1990’s, with the typical feedstock prepared from tree pulp or cotton linters. In recent years, there have been advancements in the utilisation of high alpha-cellulose agricultural biomass for L-MMCF feedstock. Industrial hemp stalks offer a unique opportunity for L-MMCF since hemp is considered an environmentally conscious crop that can also help to bridge the gap in worldwide cellulose shortages; additionally, industrial hemp stalks are high in alpha-cellulose, making this an ideal feedstock for L-MMCF manufacturing. This review paper outlines the lyocell process in detail, including processes for preparation of feedstocks, pulp processing, removal of contaminants and nonessential plant components, pulp dissolution, dope preparation, and fibre spinning. Opportunities and challenges associated with the utilisation of industrial hemp stalks as an alternative feedstock are addressed through all steps of the manufacturing process. Incorporating alternative feedstock opens new perspectives for manufacturing sustainable L-MMCF.

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“…The total pore volume of cellulose can be correlated to the water retention value (WRV) which has been extensively used for cellulose pulp bers (Maloney et al 2023), and some reports with dried MMCF (Kongdee et al 2004). Methods that can analyze pore size distribution of cellulose in the wet state, and thus never-dried MMCF, are thermoporometry (Koistinen et al 2023), cryo NMR (Östlund et al 2013), and ber saturation point (Luukko and Maloney 1999).…”

Section: Introductionmentioning

confidence: 99%

Revealing pore size distribution in cellulose and lignin-cellulose man-made fibers – effect of draw ratio and lignin content

Bengtsson,

Johnsson,

Ulmefors

et al. 2024

Preprint

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There are limited methods available for measurement of the porosity of cellulose fibers, even more so for obtaining a pore size distribution. Conventional pore analysis methods require dry samples, with intact pores. However, pores in cellulose fibers collapse when dried from water and thus present a challenge for sample analysis. Furthermore, the pore collapse is partially irreversible (hornification) which should be accounted for in the analysis. In this study, analysis of pore structure was carried out in the wet state with thermoporosimetry and also for critical point dried samples, analyzed with N2 sorption. This study determines the effect of fiber lignin content and certain spinning parameters on the pore size distribution of spun fibers before and after drying. It could also be concluded that solvent exchange, drying from a non-polar solvent will result in an altered pore size distribution, with a total pore volume greater than if dried from water, however not representative of the never-dried state. It is concluded that thermoporosimetry together with the water retention value (WRV) measurement is a powerful combination to acquire insights to the pore size distribution of spun fiber.

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Effect of pulp prehydrolysis conditions on dissolution and regenerated cellulose pore structure

Cited by 9 publications

References 47 publications

Recent Progress on Conversion of Lignocellulosic Biomass by MOF-Immobilized Enzyme

Recent Progress on Conversion of Lignocellulosic Biomass by MOF-Immobilized Enzyme

Processes and Challenges for the Manufacturing of Lyocell Fibres with Alternative Agricultural Feedstocks

Revealing pore size distribution in cellulose and lignin-cellulose man-made fibers – effect of draw ratio and lignin content

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