Hydrothermal dissolution of mixed southern hardwoods

Tunç, Mehmet; Heiningen, A. R. P. Van

doi:10.1515/hf.2008.100

Cited by 63 publications

(37 citation statements)

References 19 publications

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“…7. With the elevation of the holding temperature from 150 °C to 190 °C, arabinan removal increased from 71.1% to 100.0%, and xylan removal from 8.0% to 74.7%, a similar trend to that of HWP found by Tunc and Van Heiningen (2008). The trend related to CSFs well, which were -2.87, -2.14, -0.95, 0.62, and 1.49 for 150 °C, 160 °C, 170 °C, 180 °C, and 190 °C, respectively.…”

Section: Pentosan Dissolution At Different Holding Temperaturessupporting

confidence: 69%

Research on the Dissolution of Pentosans during Eucalyptus Hydrolysate Pretreatment

Liu

Guo

et al. 2017

BioResources

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Hydrolysate pretreatment (HP) uses hot water pre-hydrolysis liquor (HWPL) as partial or full pretreatment medium for biomass. Pentosan dissolution during Eucalyptus HP was studied under holding times between 0 min and 160 min, holding temperatures between 150 °C and 190 °C, a hot water pre-hydrolysate ratio (HWPR) from 20% to 100%, and a fixed liquid to wood ratio of 1:6. Both the pentosan removals in the hydrolysate pretreated solid (HPS) and the hydrolysate pretreatment liquor (HPL) pento-saccharides contents were determined and compared with those of hot water pre-hydrolysis (HWP). When compared to HWP, the HP enhanced pentosan removal from the solid phase, and enriched the saccharides or promoted the in-situ conversion of saccharides into other chemicals in the liquid phase. Pentosan removal in the HPS increased when holding time and temperature were increased. Increasing holding time first increased the pento-saccharide content in the HPL, and then decreased it after reaching the maximum. Elevating the holding temperature increased the pento-saccharide content in the HPL, except for arabino-oligosaccharide. Different HWPR had varying influences on pentosan removal in the HPS and on the saccharides concentration in the HPL. When controlled, HP positively influenced hemicellulose removal from biomass, and increased utilization value of the liquid phase obtained post pretreatment. Dalian, Liaoning, 116034 China; b: State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640; * Corresponding authors: 286911185@qq.com; zhoujh@dlpu.edu.cn Keywords INTRODUCTIONFossil fuel resources have been the main energy and chemical source for humans since the Industrial Revolution. However, the availability of fossil fuel resources on earth is limited. Biomass resources are renewable, in contrast to fossil fuel resources, and sustainable management can be obtained in the long term if the biomass is properly utilized (Amidon and Liu 2009). Plant biomass is mainly composed of cellulose, hemicellulose, and lignin (Agbor et al. 2011). Cellulose is a highly crystallized polymer with glucose as the monomer. Hemicellulose is polymerized from several different monosaccharides such as pentoses (arabinose, xylose, etc.) and hexoses (galactose, glucose, mannose, etc.). Lignin is a three-dimensional natural polymer with building blocks of phenylpropane units joined together through ether bonds and carbon-carbon bonds. The existence of complex linkages, caused by physical or chemical action between those three components, makes plant biomass resistant to the production of chemicals or fuel directly (Yedro et al. 2015). PEER-REVIEWED ARTICLEbioresources.com Ma et al. (2017). "Dissolution of pentosans," BioResources 12(2), 3677-3694. 3678Traditionally, hemicellulose is partly dissolved in the pulping effluent during the pulping process and burned to produce heat together with lignin, which dramatically hinders its utilization. In recent years, scientists worldwide have paid increasing a...

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Section: Pentosan Dissolution At Different Holding Temperaturessupporting

confidence: 69%

Research on the Dissolution of Pentosans during Eucalyptus Hydrolysate Pretreatment

Liu

Guo

et al. 2017

BioResources

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“…In addition to the modification described earlier (Tunc and van Heiningen 2008a), three more solvent bottles were connected to the system through a four-way switching valve immediately before the extraction cell for multi-stage extraction, as illustrated in Fig. 1.…”

Section: Methodsmentioning

confidence: 99%

Two-Stage Fractionation of Hardwoods

Tunç¹,

Chheda²,

Heide³

et al. 2013

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A two-stage lignocellulosic biomass fractionation process consisting of a formic-or acetic acid-reinforced wood autohydrolysis step followed by an ethanol-water treatment was applied to a mixture of Southern hardwood chips. The wood products in the hydrolysate were mostly monomeric xylose, other monomeric sugars, polymeric hemicelluloses, acetic acid, and a relatively small amount of lignin. The second step mostly dissolves sulfur-free lignin, while the fibrous residue consists mainly of cellulose fibers, which may be used for liquid fuels or pulp production. The yield composition, and quality of these products were determined as a function of treatment conditions, with the aim to develop an economic and robust biorefinery fractionation technology.

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“…15,16 Although there are many other alternative methods of isolating xylan from plant cell walls of lignocellulosic materials such as the use of organic solvents (organosolv pulping), 17,18,19 hydrothermal aquoeus solvents 20,21,22,23,24,25,26, and ionic liquid extractions, 27,28 the yields of the extracted xylans are limited. For instance, the extraction of higher molecular weight (>20 000 Da) xylans from barley husks by hydrothermal aqueous method were limited to 9% 29 compared with the yields of up to 50 to 83% obtained from extraction of the xylans from similar lignocellulosic materials using mild alkali-low temperature extraction protocols that use alkaline methods with alkali charge of < 16% and temperature <80…”

Section: Introductionmentioning

confidence: 99%

Isolation, characterization and enzymatic modification of water soluble xylans from Eucalyptus grandis wood and sugarcane bagasse

Chimphango

Zyl

Görgens

2012

J of Chemical Tech & Biotech

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BACKGROUND: There is growing interest in utilizing xylans as biodegradable polymers to replace synthetic additives, coatings and encapsulation matrices. However, techniques are required to reduce the water solubility of the xylan for such applications. The study objective was to isolate and characterize water soluble xylans from Eucalyptus grandis wood and sugarcane (Saccharum officinarum L) bagasse for subsequent precipitation in water by enzymatic modification.

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Hydrothermal dissolution of mixed southern hardwoods

Cited by 63 publications

References 19 publications

Research on the Dissolution of Pentosans during Eucalyptus Hydrolysate Pretreatment

Research on the Dissolution of Pentosans during Eucalyptus Hydrolysate Pretreatment

Two-Stage Fractionation of Hardwoods

Isolation, characterization and enzymatic modification of water soluble xylans from Eucalyptus grandis wood and sugarcane bagasse

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