Quantitative characterization of the impact of pulp refining on enzymatic saccharification of the alkaline pretreated corn stover

Xu, Huanfei; Li, Bin; Mu, Xindong; Yu, Guang; Liu, Chao; Zhang, Yuedong; Wang, Haisong

doi:10.1016/j.biortech.2014.06.068

Cited by 34 publications

(28 citation statements)

References 31 publications

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“…These results are in agreement with a reduction in crystallinity index due to the breakdown of highly ordered crystalline structure and/or hornification of cellulose nanofibers under a high shear rate during nanofibrillation [ 12 , 34 ]. Furthermore, PFI refining during mechanical pretreatment could also contribute to the reduction in crystallinity index [ 35 ].…”

Section: Resultsmentioning

confidence: 99%

Cellulose Nanofibers from a Dutch Elm Disease-Resistant Ulmus minor Clone

et al. 2020

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The potential use of elm wood in lignocellulosic industries has been hindered by the Dutch elm disease (DED) pandemics, which have ravaged European and North American elm groves in the last century. However, the selection of DED-resistant cultivars paves the way for their use as feedstock in lignocellulosic biorefineries. Here, the production of cellulose nanofibers from the resistant Ulmus minor clone Ademuz was evaluated for the first time. Both mechanical (PFI refining) and chemical (TEMPO (2,2,6,6-tetramethylpiperidine-1-oxyl radical)-mediated oxidation) pretreatments were assessed prior to microfluidization, observing not only easier fibrillation but also better optical and barrier properties for elm nanopapers compared to eucalyptus ones (used as reference). Furthermore, mechanically pretreated samples showed higher strength for elm nanopapers. Although lower nanofibrillation yields were obtained by mechanical pretreatment, nanofibers showed higher thermal, mechanical and barrier properties, compared to TEMPO-oxidized nanofibers. Furthermore, lignin-containing elm nanofibers presented the most promising characteristics, with slightly lower transparencies.

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Section: Resultsmentioning

confidence: 99%

Cellulose Nanofibers from a Dutch Elm Disease-Resistant Ulmus minor Clone

et al. 2020

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“…1). PFI refining could enlarge the benefits obtained from CSLS due to the further modifications of fiber (Xu et al, 2014). However, the final total sugar yields decreased when CSLS loading was over 2%.…”

Section: Effect Of Map Of Corn Stover By Using Commercial Sodium Lignmentioning

confidence: 88%

“…(2) The efficiency of enzymatic saccharification achieved by conventional alkali pretreatment was limited. For instance, after enzymatic hydrolysis by using cellulase of 20 FPU/g-substrate, the final total sugar yields of corn stover pretreated by 10 wt% sodium hydroxide was only 61.37% (Xu et al, 2014). (3) The spent liquor containing much alkali and lignin has not been fully and efficiently utilized.…”

Section: Introductionmentioning

confidence: 99%

“…The surfactant with high hydrophilicity could promote chemical penetration and dissolution of lignin during pretreatment (Cao and Aita, 2013), but surfactant was usually expensive and can also bring some bubble issues in pretreatment. Secondly, mechanical refining after chemical pretreatment could usually be conducted to further improve the enzyme accessibility by increasing the porosity of substrate and reducing cellulose crystallinity (Xu et al, 2014;Jones et al, 2014). Lastly, spent liquor reuse could be carried out to save alkali and reduce water usage.…”

Section: Introductionmentioning

confidence: 99%

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Effect and characterization of sodium lignosulfonate on alkali pretreatment for enhancing enzymatic saccharification of corn stover

et al. 2015

Industrial Crops and Products

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“…In addition to its ability to reach the maximum theoretical conversion with mechanical refining, the technology should be evaluated for its ability to consistently control and monitor the process conditions and biomass properties within the biorefinery. Xu et al (2014) quantified the changes that occurred during the mechanical refining of alkaline pretreated corn stover, and they identified correlations between these changes and enzymatic hydrolysis conversion. Their work allowed for the prediction of the downstream hydrolysis efficiency and increased effective control of the biorefinery process, based on upstream real time mechanical refining targets.…”

Section: Improved Process Controlmentioning

confidence: 99%

Optimization of Pilot Scale Mechanical Disk Refining for Improvements in Enzymatic Digestibility of Pretreated Hardwood Lignocellulosics

Jones¹,

Venditti²,

Park³

et al. 2017

BioResources

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Mechanical refining has potential application for overcoming lignocellulosic biomass recalcitrance to enzyme hydrolysis and improving biomass digestibility. This study highlighted the ability for a pilot scale disc refiner to improve the total carbohydrate conversion to sugars from 39% (unrefined hardwood sodium carbonate biomass) to 90% (0.13 mm gap, 20% consistency, ambient temperature) by optimizing the refining variables. The different biomass properties that changed with refining indicated the expected increase in sugar conversion. Controlling the refining parameters to narrower gaps and higher consistencies increased the resulting refined biomass hydrolysis. Positive correlations that increases in net specific energy (NSE) input and refining intensity (SEL) improved the enzymatic hydrolysis. In some severe cases, over-refining occurred when smaller gaps, higher consistencies, and more energy input reached a point of diminished return. The energy input in these scenarios, however, was much greater than realistically feasible for industrial application. Although well-established in the pulp and paper industry, gaps in understanding the fundamentals of refining remain. The observations and results herein provide the justification and opportunity for further mechanical refining optimization to maximize and adapt the mechanical refining technology for maximum efficiency within the process of biochemical conversion to sugar. Keywords: Hardwood biomass; Biochemical conversion; Pretreatment; Mechanical refining; Enzymatic hydrolysisContact information: Department of Forest Biomaterials, North Carolina State University, Raleigh, NC 27695-8005 USA; *Corresponding author: richard_venditti@ncsu.edu INTRODUCTION Biorefinery ConceptThe biorefinery concept, defined as "the sustainable processing of biomass into a spectrum of marketable products and energy," is an approach that can mitigate the negative environmental impacts of fuel and chemical production by providing alternatives to oil refining products (Cherubini 2010).Lignocellulosic biomass is an extremely diverse class of material and has a complex structure composed of cellulose, hemicellulose, and lignin naturally constructed in a multifaceted matrix. Understanding the chemical and biochemical challenges based on lignocellulosic biomass recalcitrance, which can be defined as the natural resistance to biological deconstruction, remains one of the major technical barriers to the commercialization of second generation cellulosic biorefineries (Zhao et al. 2012). Embracing the challenge as an intentional practice of engineered biomass deconstruction PEER-REVIEWED ARTICLE bioresources.com Jones et al. (2017). "Mechanical disk refining," BioResources 12(3), 4567-4593. 4568 allows for an opportunity to harvest the inherently useful properties of biomass for creating value-added products through the biorefinery concept. Many innovative technologies have been developed to address this issue and improve the biomass hydrolysis yield. The issue with these technologies...

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Quantitative characterization of the impact of pulp refining on enzymatic saccharification of the alkaline pretreated corn stover

Cited by 34 publications

References 31 publications

Cellulose Nanofibers from a Dutch Elm Disease-Resistant Ulmus minor Clone

Cellulose Nanofibers from a Dutch Elm Disease-Resistant Ulmus minor Clone

Effect and characterization of sodium lignosulfonate on alkali pretreatment for enhancing enzymatic saccharification of corn stover

Optimization of Pilot Scale Mechanical Disk Refining for Improvements in Enzymatic Digestibility of Pretreated Hardwood Lignocellulosics

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