A process for producing lignin and volatile compounds from hydrolysis liquor

Khazraie, Tooran; Zhang, Yiqian; Tarasov, Dmitry; Gao, Weijue; Price, Jacquelyn T.; DeMartini, Nikolai; Hupa, Leena; Fatehi, Pedram

doi:10.1186/s13068-017-0729-9

Cited by 18 publications

(7 citation statements)

References 53 publications

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“…The global overconsumption of fossil fuels has driven the development of the lignocellulosic biorefinery concept, an industrial process that converts sustainably sourced lignocellulosic biomass into energy, chemicals, and fuels [1, 2]. A suitable candidate for such processing is sugarcane bagasse (SB), which is one of the most abundant types of lignocellulosic biomass in China and in other parts of the world [3].…”

Section: Introductionmentioning

confidence: 99%

Eco-friendly consolidated process for co-production of xylooligosaccharides and fermentable sugars using self-providing xylonic acid as key pretreatment catalyst

Zhou

2019

Biotechnol Biofuels

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BackgroundObtaining high-value products from lignocellulosic biomass is central for the realization of industrial biorefinery. Acid pretreatment has been reported to yield xylooligosaccharides (XOS) and improve enzymatic hydrolysis. Moreover, xylose, an inevitable byproduct, can be upgraded to xylonic acid (XA). The aim of this study was to valorize sugarcane bagasse (SB) by starting with XA pretreatment for XOS and glucose production within a multi-product biorefinery framework.ResultsSB was primarily subjected to XA pretreatment to maximize the XOS yield by the response surface method (RSM). A maximum XOS yield of 44.5% was achieved by acid pretreatment using 0.64 M XA for 42 min at 154 °C. Furthermore, XA pretreatment can efficiently improve enzymatic digestibility, and achieved a 90.8% cellulose conversion. In addition, xylose, the inevitable byproduct of the acid-hydrolysis of xylan, can be completely converted to XA via bio-oxidation of Gluconobacter oxydans (G. oxydans). Subsequently, XA and XOS can be simultaneously separated by electrodialysis.ConclusionsXA pretreatment was explored and exhibited a promising ability to depolymerize xylan into XOS. Mass balance analysis showed that the maximum XOS and fermentable sugars yields reached 10.5 g and 30.9 g per 100 g raw SB, respectively. In summary, by concurrently producing XOS and fermentable sugars with high yields, SB was thus valorized as a promising feedstock of lignocellulosic biorefinery for value-added products.

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Section: Introductionmentioning

confidence: 99%

Eco-friendly consolidated process for co-production of xylooligosaccharides and fermentable sugars using self-providing xylonic acid as key pretreatment catalyst

Zhou

2019

Biotechnol Biofuels

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“…In addition, the Tg of LX-lignin was similar to that of F-lignin and commercial alkaline lignin in Table 3. Overall, the Tg of lignin was not signi cantly changed when extracted via different methods from PHL [39,40].…”

Section: Dsc Analysis Of Lignin Samplesmentioning

confidence: 91%

Enhanced biochemical process for purifying xylo-oligosaccharides from pre-hydrolysis liquor

Yang¹,

Xu²,

Ji³

et al. 2020

Preprint

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Background Xylo-oligosaccharides (XOS) are promising biomass-derived chemicals that can be widely used in preparing medicines, food additives, and industrial chemicals. The pre-hydrolysis liquor (PHL) produced in the kraft-based dissolving pulp production process is rich in hemicelluloses and especially in XOS/xylan. Results In this study, a sustainable sequential process that included calcium hydroxide (CH), simultaneous laccase and xylanase (LX) and activated carbon (AC) treatments was proposed for more efficient recovery of XOS/xylan from PHL. Overall, the concentration of lignin, furfural and xylosugars decreased by 81.7 wt.%, 100 wt.% and 5.1 wt.%, respectively, but XOS concentration was increased by 36.6 wt.%. More importantly, the 2D-HSQC NMR and FT-IR were used in understanding the structure of sugar and lignin components in each step of the process and in the final products. The CH treatment mainly altered the chemical structure of XOS due to the release of acetyl groups, and downstream treatment steps have insignificant effect on XOS structures. Also, lignin carbohydrate complexes (LCC, i.e. PhGlc3) minimally existed in the purified XOS. The GPC and DSC results revealed that the molecular weight of the extracted lignin was 1768 ~ 2532 g/mol and it had a wide glass transition temperature (Tg) range (63 ~ 115 °C). Conclusions The results confirmed that a combination of sequentially treating PHL with calcium hydroxide (CH), simultaneous laccase and xylanase (LX) and activated carbon (AC) was effective in removing lignin and concentrating XOS in the PHL.

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“…Samples were heated isothermally at 100 °C to ensure the removal of any moisture. Then, they were heated from room temperature to 700 °C at 10 °C/min heating rates under nitrogen (35 mL/ min) …”

Section: Methodsmentioning

confidence: 99%

Modification of Kraft Lignin with Dodecyl Glycidyl Ether

Alwadani

Fatehi

2019

ChemistryOpen

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Kraft lignin (KL) is extensively produced in industry but is mainly burned as fuel. To broaden its use, KL was grafted with dodecyl glycidyl ether to alter its thermal properties. The reaction of KL with dodecyl glycidyl ether (DGE) was analyzed using nuclear magnetic resonance (NMR), Fourier infrared spectroscopy (FT‐IR) and elemental analysis. Alternatively, KL was methylated to mask its phenolic hydroxy groups to investigate how phenolic hydroxy groups impact the grafting of the alkyl chain of DGE onto lignin (methylated Kraft lignin, MKL). The methylation facilitated the molecular weight enhancement and thermal stability reduction of Kraft lignin via grafting with DGE. The influence of grafting alkyl chains on the structural and thermal properties of KL and MKL was studied using thermogravimetric analysis and differential scanning calorimetry analysis. Our data suggest that, due to their high molecular weights and lower glass transition temperatures, the produced lignin derivatives may be promising feedstocks for composite production.

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A process for producing lignin and volatile compounds from hydrolysis liquor

Cited by 18 publications

References 53 publications

Eco-friendly consolidated process for co-production of xylooligosaccharides and fermentable sugars using self-providing xylonic acid as key pretreatment catalyst

Eco-friendly consolidated process for co-production of xylooligosaccharides and fermentable sugars using self-providing xylonic acid as key pretreatment catalyst

Enhanced biochemical process for purifying xylo-oligosaccharides from pre-hydrolysis liquor

Modification of Kraft Lignin with Dodecyl Glycidyl Ether

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