Enhanced removal of hemicelluloses from cellulosic fibers by poly(ethylene glycol) during alkali treatment

Li, Jianguo; Ma, Xiaojuan; Duan, Chao; Zhang, Hongjie; Ni, Yonghao

doi:10.1007/s10570-015-0800-2

Cited by 23 publications

(12 citation statements)

References 22 publications

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“…High molecular weight xylans are useful for packaging films that provide oxygen and mineral oil barrier properties (Grondahl and Bindgard 2013). Cold caustic extraction with polyethylene glycol helped preserve the yield, polydispersity, and molecular weight of xylans (Li et al 2015b).…”

Section: Niche Markets For Kraft Mill Biorefinery Productsmentioning

confidence: 99%

Integrating a Biorefinery into an Operating Kraft Mill

Johnson¹,

Hart²

2016

BioResources

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Kraft pulp and paper mills have several advantages for serving the emerging biorefinery industry as a source of raw materials. This review examines technologies for producing liquid biofuels, chemicals, and advanced materials from woody feedstocks to generate new sources of revenue. Market pull comes in part from government policies that drive substitution of petroleum-based products with biobased equivalents. Kraft mills have ample networks to supply feedstocks, whether these are forest residues or byproduct side streams. Pulp mills are well suited to expand sufficiently to accommodate production of value added platform chemicals that are in demand because of brand owner sustainability commitments.

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Section: Niche Markets For Kraft Mill Biorefinery Productsmentioning

confidence: 99%

Integrating a Biorefinery into an Operating Kraft Mill

Johnson¹,

Hart²

2016

BioResources

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“…Hemicellulose is another carbohydrate polymer in wood and has a lower content of ∼20−30 wt %, with a complex chemical structure composed of hexose (glucose, mannose, and galactose) and pentose (xylose and arabinose). 31,32 Finally, lignin, different from the carbohydrate polymers of cellulose and hemicellulose, displays a complex structure constructed from the basic units of phenylpropane (C3−C6 structure), which have three types of ρcoumaryl alcohol (H), coniferyl alcohol (G), and sinapyl alcohol (S). 28,33 Of note, lignin of hardwood is mainly composed of G and S units, whereas the softwood lignin is primarily G units with low amount of H units.…”

Section: Wood's Physical Structure and Chemical Componentsmentioning

confidence: 99%

“…Cellulose makes up ∼40–50 wt % of wood’s content and is composed of numerous d -glucose units joined together by covalent and hydrogen bonds, which results in a linear and stiff macromolecular structure. , This unique structure imparts cellulose with a load-bearing function in trees. Hemicellulose is another carbohydrate polymer in wood and has a lower content of ∼20–30 wt %, with a complex chemical structure composed of hexose (glucose, mannose, and galactose) and pentose (xylose and arabinose). , Finally, lignin, different from the carbohydrate polymers of cellulose and hemicellulose, displays a complex structure constructed from the basic units of phenylpropane (C3–C6 structure), which have three types of ρ-coumaryl alcohol (H), coniferyl alcohol (G), and sinapyl alcohol (S). , Of note, lignin of hardwood is mainly composed of G and S units, whereas the softwood lignin is primarily G units with low amount of H units. These lignin basic units connect with each other via carbon–carbon and ether bonds, forming various functional groups (e.g., phenolic and aliphatic hydroxyls, methoxy, and carbonyl) in the 3D-network structure of lignin …”

Section: Wood’s Physical Structure and Chemical Componentsmentioning

confidence: 99%

In Situ Wood Delignification toward Sustainable Applications

et al. 2021

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Conspectus As one of the most abundant and versatile natural materials on Earth, recently wood has attracted tremendous attention from scientists and engineers due to its outstanding advantages, including hierarchically porous microstructure, high mechanical strength, environmental friendliness, renewability, and biodegradability. Wood’s hierarchically porous structure and chemical components (e.g., cellulose, hemicelluloses, and lignin) enable its mechanical, ionic, optical, and thermal properties to be tuned via physical, chemical, and/or thermal modifications. Among these various approaches, the chemical delignification of bulk wood is the most fascinating, in which the majority of lignin and hemicelluloses is removed while leaving the cellulose intact, maintaining wood’s physical integrity and hierarchical structure. This delignified structure is unique, composed of hollow, aligned channels made up of cellulose microfibrils, and particularly attractive given its origin from a sustainable and renewable resource. As a result, delignified wood has attracted increasing attention for applications that go far beyond traditional wood utilization, such as lightweight yet strong structural materials, energy storage and conversion, environmental remediation, flexible electronics, and bioengineering. This Account reviews recent developments in bulk wood delignification strategies toward the achievement of such advanced wood technologies for sustainable applications, with a focus on the research in our group. Similar to chemical pulping and bleaching, wood delignification involves a series of nucleophilic reactions based on alkaline Na2SO3 or Na2S systems (i.e., chemical pulping) or electrophilic, radical, and oxidation reactions based on H2O2, ClO2, or NaClO systems (i.e., chemical bleaching) to deconstruct, fragment, and promote the hydrophilicity of lignin macromolecules, which finally make lignin easier to be removed. We discuss the structure and properties of partially and near-completely delignified wood, with a focus on process-structure–property relationships. The resulting delignified wood materials, with tunable structure and properties, demonstrate various advanced functions, in a wide range of advanced applications, such as building and construction, green energy, and electronics. Finally, the potential challenges and appealing perspectives of in situ wood delignification are discussed. In situ wood delignification, as a powerful modification strategy, has speeded up the development of advanced wood technologies and wood-based functional materials and products.

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“…Some studies in the literature have also reported an increase in dissolution of hemicellulose from cellulosic fibers by PEG during alkali pretreatment. 39 When PEG was added to softwood pulp, a significant amount of hemicellulose was removed due to the improved inward diffusion of NaOH aided by PEG due to the swelling of the fibers. 39 Thus, by utilizing both imidazole and PEG in a twocomponent solvent, enhanced production of protons aids in the cleavage of lignin−carbohydrate complex and the glycosidic bonds in cellulose.…”

Section: Industrial and Engineering Chemistry Researchmentioning

confidence: 99%

Development of Novel Imidazole–Poly(ethylene glycol) Solvent for the Conversion of Lignocellulosic Agro-Residues to Valuable Chemicals

Dhar

Jose

Pilloni

et al. 2019

Ind. Eng. Chem. Res.

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In this study, rice straw and sugar cane bagasse were pretreated using a novel imidazole:poly(ethylene glycol) (IPEG) solvent at temperatures between 120 and 200 °C for 1 h. The pretreatment using IPEG with molecular weight of PEG of 200 g/mol (IPEG200) resulted in 83% and 92% of xylan from rice straw and bagasse, respectively, being converted to furfural. The solubility of xylan was highest in IPEG200, which had higher hydrogen bonding acidity, hydrogen bonding basicity, and polarizability. The yield of glucose from pretreated residues via enzymatic hydrolysis was highest for rice straw treated with IPEG200 (27%) compared to the untreated sample (9%). Pretreatment of sugar cane bagasse using IPEG200 resulted in higher yield of furan derivatives (600 g/kg) compared to that from rice straw. The pyrolysates from the enzymatic hydrolysis residues contained a significantly lower amount of carboxylic acid and furan derivatives due to the removal of hemicellulose during the pretreatment process.

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Enhanced removal of hemicelluloses from cellulosic fibers by poly(ethylene glycol) during alkali treatment

Cited by 23 publications

References 22 publications

Integrating a Biorefinery into an Operating Kraft Mill

Integrating a Biorefinery into an Operating Kraft Mill

In Situ Wood Delignification toward Sustainable Applications

Development of Novel Imidazole–Poly(ethylene glycol) Solvent for the Conversion of Lignocellulosic Agro-Residues to Valuable Chemicals

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