Effect of hot-water extraction (HWE) severity on bleached pulp based biorefinery performance of eucalyptus during the HWE–Kraft–ECF bleaching process

Liu, Jing; Li, Meng; Luo, Xiaolin; Chen, Lihui; Huang, Liulian

doi:10.1016/j.biortech.2015.01.055

Cited by 31 publications

(21 citation statements)

References 34 publications

(62 reference statements)

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“…[6] As an important pulpingp rocess, Kraft pulping with NaOH and Na 2 Si st he mostw idely used for delignification of hardwoods and softwoods to produce pulp. Recently,i th as been reported that HTP prior to Kraft pulpingc ould facilitate the subsequent pulping of hardwood: [16][17][18] the delignification degree of crude pulp after the integrated processw as significantly improved comparedw ith traditional pulping processes. As an environmentally friendly and economically feasible technology,h ydrothermal pretreatment (HTP)c an promote the conversion of hemicellulose into xylo-oligosaccharides (XOS) or monosaccharides without causing significant degradation of cellulose.…”

Section: Introductionmentioning

confidence: 99%

“…the degraded sugars from hemicelluloses can be recoveredf or further utilization.F or example, XOS can be utilized in the fields of pharmaceutical, food, and nutraceutical chemistry.T he solid phase (mainly cellulose and lignin) can be used for further processing, such as cellulosic ethanol production or pulping. Recently,i th as been reported that HTP prior to Kraft pulpingc ould facilitate the subsequent pulping of hardwood: [16][17][18] the delignification degree of crude pulp after the integrated processw as significantly improved comparedw ith traditional pulping processes.…”

Section: Introductionmentioning

confidence: 99%

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Unraveling the Fate of Lignin from Eucalyptus and Poplar during Integrated Delignification and Bleaching

Wang

Sun

et al. 2019

ChemSusChem

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Efficient deconstruction of lignocellulose is vitally important for the biorefinery industry because lignin structures play a crucial role in the high value‐added conversion of lignin. In this study, an integrated process based on hydrothermal pretreatment (HTP) and Kraft delignification was proposed to deconstruct lignocellulosic biomass. It was found that the HTP not only facilitated the production of xylo‐oligosaccharides but also reduced the chemicals dosage of the following delignification. The structural characteristics of lignin obtained from the integrated process were investigated by NMR spectroscopy and gel‐permeation chromatography. Additionally, double enzymatic lignins (DELs) isolated from different feedstocks were used as “model lignin” to delineate the structural transformations of lignin during H2O2, ClO2, and O3 bleaching. Significant changes of the lignin structure were observed during the ClO2 bleaching process, including degradation of aromatic rings, enrichment in p‐hydroxyphenyl units, and increase of carboxylic groups. A comparison of the structural characteristics of the bleached lignins indicated that HTP benefited the subsequent bleaching process. Enhanced knowledge of lignin chemistry during deconstruction and delignification could provide valuable insight into the current lignocellulose biorefinery.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Unraveling the Fate of Lignin from Eucalyptus and Poplar during Integrated Delignification and Bleaching

Wang

Sun

et al. 2019

ChemSusChem

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“…Because of the increased cost of raw materials and environmental concerns, the profitability of chemical pulp mills, which are the largest manufacturers of lignocellulosic materials, is gradually decreasing. Efficient utilization of the renewable biomass raw material and expansion of high value‐added products are therefore highly desirable . Consequently, the integration of novel separation and conversion technologies into existing chemical pulp mills is necessary for the production of new biomaterial and renewable energy, while continuing to meet the demand for pulp and paper products for end use…”

Section: Introductionmentioning

confidence: 99%

Balancing the effect of pretreatment severity on hemicellulose extraction and pulping performance during auto‐hydrolysis prior to kraft pulping of acacia wood

Shi

Zhou

Jia

et al. 2019

Biotechnology Progress

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When using a combination of pre-extraction and chemical pulping, a high yield of sugar recovery and minimal negative effect on the subsequent pulping step are expected. In this work, the P factor was utilized to investigate the effect of autohydrolysis severity on sugar recovery, removal of the main component, and impact on the kraft pulping of acacia wood chips. Using a P factor of 235, 84.34% of the polysaccharides in 14.05 g L −1 of dissolved sugars could be obtained. In addition, the soluble sugars were easily separated with a recovery yield of 3.54 g ÁL −1 and Mw of 4,690 g mol −1 by direct precipitation using organic solvents. However, a maximum of 22.14 g L −1 of dissolved sugars was obtained with approximately 72.53% polysaccharides and Mw of 2,198 g mol −1 for a P factor of 601. Moreover, nearly 50% of the degraded carbohydrates remained in the auto-hydrolyzed wood chips. The decrease in the mass of pentosan, holocellulose, and klason lignin was 62, 30, and 8.76%, respectively. With intensifying severity, the screened yield and viscosity of pulps decreased markedly, whileas the Kappa number increased. No significant differences were observed in the morphology of the resultant fibers. Moreover, there was a decrease in the physical strength of the pulps due to the loss of the intrinsic strength of the pulp fibers, which in turn resulted from the cellulose damage. The combustion performance of the resultant pulping black liquor is improved due to the higher lignin content. K E Y W O R D S auto-hydrolysis, biorefinery, hard wood, hemicellulose, kraft pulping

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“…It provides theoretical support for the efficient utilization of all components of woody biomass.Polymers 2020, 12, 612 2 of 16 environmentally benign process that has been widely used for lignocellulose biomass pretreatment [15]. At present, the research on hydrothermal pretreatment focuses not only on wood materials, but also on bamboo and other non-wood materials [16,17]. The hemicellulose of bamboo was extracted in large quantities during the pretreatment, which effectively promoted the enzymatic hydrolysis efficiency [18].…”

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confidence: 99%

Effect of Pre-Corrected pH on the Carbohydrate Hydrolysis of Bamboo during Hydrothermal Pretreatment

Huang

Yang

et al. 2020

Polymers

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To confirm the prospects for application of pre-corrected pH hydrothermal pretreatment in biorefineries, the effects of pH on the dissolution and degradation efficiency of carbohydrates were studied. The species composition of the hydrolysate was analyzed using high efficiency anion exchange chromatography and UV spectroscopy. The result showed that the greatest balance between the residual solid and total dissolved solids was obtained at pH 4 and 170 • C. Maximum recovery rates of cellulose and lignin were as expected, whereas hemicellulose had the least recovery rate. The hemicellulose extraction rate was 42.19%, and the oligomer form accounted for 93.39% of the product. The physicochemical properties of bamboo with or without pretreatment was characterized. Compared with the traditional hydrothermal pretreatment, the new pretreatment bamboo has higher fiber crystallinity and thermal stability. In the pretreatment process, the fracture of β-aryl ether bond was inhibited and the structural dissociation of lignin was reduced. The physicochemical properties of bamboo was protected while the hemicellulose was extracted efficiently. It provides theoretical support for the efficient utilization of all components of woody biomass.Polymers 2020, 12, 612 2 of 16 environmentally benign process that has been widely used for lignocellulose biomass pretreatment [15]. At present, the research on hydrothermal pretreatment focuses not only on wood materials, but also on bamboo and other non-wood materials [16,17]. The hemicellulose of bamboo was extracted in large quantities during the pretreatment, which effectively promoted the enzymatic hydrolysis efficiency [18]. However, during the hydrothermal pretreatment of bamboo, the degradation of cellulose increased with the dissolution of hemicellulose [17]. Many factors considerably influence the hydrothermal pretreatment of biomass, such as the physical properties of the biomass and the physical and chemical properties [19]. Other factors include the type of reactor and the catalyst. The hydroxyaldehyde condensation reaction can be easily achieved under alkaline conditions [20,21]. Acidic conditions were found to be suitable for dehydration [22]. Sulfuric acid and sodium hydroxide have been used to change the acid-base environment of the reaction. By adjusting the pH, the reaction direction can affect the direction to effective products [23]. High value utilization of woody biomass was promoted by hydrothermal pretreatment. For example, the separation and purification of cellulose were enhanced. The nanocellulose was prepared by oxidation of cellulose [24,25]. The application of nanocomposites was promoted by surface modification/surfactant polymerization of nanocellulose [26,27].A novel, pre-corrected pH hydrothermal pretreatment was performed to integrate pH control without additional steps or equipment, resulting in the best balance between the residual solid and dissolved solid [3]. A buffer system was established by pre-correcting the pH value of the extraction solution. It...

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Effect of hot-water extraction (HWE) severity on bleached pulp based biorefinery performance of eucalyptus during the HWE–Kraft–ECF bleaching process

Cited by 31 publications

References 34 publications

Unraveling the Fate of Lignin from Eucalyptus and Poplar during Integrated Delignification and Bleaching

Unraveling the Fate of Lignin from Eucalyptus and Poplar during Integrated Delignification and Bleaching

Balancing the effect of pretreatment severity on hemicellulose extraction and pulping performance during auto‐hydrolysis prior to kraft pulping of acacia wood

Effect of Pre-Corrected pH on the Carbohydrate Hydrolysis of Bamboo during Hydrothermal Pretreatment

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