Separation and characterization of lignin from bio-ethanol production residue

Guo, Guowan; Li, Shujun; Wang, Lu; Ren, Shixue; Gui-zhen, Fang

doi:10.1016/j.biortech.2012.10.041

Cited by 59 publications

(41 citation statements)

References 15 publications

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“…To improve its application and industrialization, various separation methods, such as distillation (Zhang et al 2013), adsorption using ion-exchange resins (Gaikar and Anasthas 2002), and micro emulsion liquid membrane separation (Wiencek and Qutubuddin 1992), have been used either to obtain useful chemicals from bio-oil or as a tool to analyze the bio-oil (Oasmaa et al 2003;Guo et al 2013). Solvent extraction is a highly efficient way to separate different fractions from bio-oil.…”

Section: Introductionmentioning

confidence: 99%

Selective Extraction of Bio-oil from Hydrothermal Liquefaction of Salix psammophila by Organic Solvents with Different Polarities through Multistep Extraction Separation

Yang¹,

Hang²,

Chen³

et al. 2014

BioResources

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Section: Introductionmentioning

confidence: 99%

Selective Extraction of Bio-oil from Hydrothermal Liquefaction of Salix psammophila by Organic Solvents with Different Polarities through Multistep Extraction Separation

Yang¹,

Hang²,

Chen³

et al. 2014

BioResources

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“…A solid-liquid extraction method merges the lignin extraction step with the solution preparation. Several solvents have been used for lignin extraction from the bioethanol coproduct, but not all of these solvents are good solvents for the electrospinning (Guo et al 2013). Knowing that N,Ndimethyl-formamide (DMF) is a good solvent for electrospinning, it was used to extract the lignin.…”

Section: Introductionmentioning

confidence: 99%

Extraction of Lignin from a Coproduct of the Cellulosic Ethanol Industry and Its Thermal Characterization

2013

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Lignin was extracted from the solid coproduct of a lignocellulosic ethanol production by a solid-liquid extraction method using N,N-dimethyl formamide. This coproduct was the residue of a steam explosion pretreatment followed by enzymatic hydrolysis process. The coproduct was used as received and also after washing. Lignin content of the solid coproduct was reduced from 63% to 43% after lignin extraction. Fourier transform infrared spectroscopy (FTIR), molecular weight measurement (GPC), and elemental analysis provided information about the chemical structure and molecular weight of the fractions. The extracted lignin had lower molecular weight (~ 5000 Da.) and higher carbon content (63%) compared to the residue of extraction (M w ≈ 8000 Da. and carbon % = 48%). Thermal stability measurements of the samples by thermogravimetry (TGA) showed that the extracted lignin had the highest carbon residue. Effects of different heating cycles on the glass transition temperature (T g ) were measured. The T g of the soluble fraction was lower than that of the coproduct. Results of the X-ray diffraction (XRD) showed the crystalline structure of cellulose in both the coproduct and the solid residue after extraction. This extraction and material characterization is helpful for liquid processes such as solution spinning or electrospinning. The thermal properties can be used for optimization of heat treatment processes such as carbonization.

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“…In the following fermentation process, the cellulose of the pretreated cornstalks was used as the raw material for conversion into bio-ethanol using the SSF (simultaneous saccharification and fermentation) method (Eckard et al 2013). Additionally, EHL was purified from ER using an alkali-solution and acid-isolation method (Guo et al 2013); all chemicals used were analytical-grade reagents.…”

Section: Experimental Materialsmentioning

confidence: 99%

Hydrothermal Degradation of Enzymatic Hydrolysis Lignin in Water-Isopropyl Alcohol Co-Solvent

Qiao

et al. 2016

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The effect of hydrothermal conditions on enzymatic hydrolysis lignin (EHL) degradation in water-isopropyl alcohol co-solvent and optimal conditions were investigated. The yields and reactivity toward formaldehyde of degraded enzymatic hydrolysis lignin (DEL) were determined. The optimal conditions of temperature, time, and ratio of solids to liquids were 250 °C, 60 min, and 1:10 (w/v), respectively. The EHL and DEL were characterized by gel permeation chromatography (GPC), Fourier transform infrared spectroscopy (FT-IR), 1 H nuclear magnetic resonance ( 1 H NMR), thermal gravity (TG), and differential scanning calorimetry (DSC) analyses. The results revealed that the molecular weight and polydispersity of DEL were lower than that of EHL. Although the fundamental structure of lignin before and after hydrothermal degradation was retained, the ether (β-O-4, α-O-4, etc.) content decreased, while that of hydroxyl (phenolic and aliphatic) increased. The DTGmax and Tg values shifted from 334 and 117 °C to 304 and 105 °C, respectively.

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Separation and characterization of lignin from bio-ethanol production residue

Cited by 59 publications

References 15 publications

Selective Extraction of Bio-oil from Hydrothermal Liquefaction of Salix psammophila by Organic Solvents with Different Polarities through Multistep Extraction Separation

Selective Extraction of Bio-oil from Hydrothermal Liquefaction of Salix psammophila by Organic Solvents with Different Polarities through Multistep Extraction Separation

Extraction of Lignin from a Coproduct of the Cellulosic Ethanol Industry and Its Thermal Characterization

Hydrothermal Degradation of Enzymatic Hydrolysis Lignin in Water-Isopropyl Alcohol Co-Solvent

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