Comparison of sodium hydroxide and calcium hydroxide pretreatments on the enzymatic hydrolysis and lignin recovery of sugarcane bagasse

Chang, Ming Xian; Li, Denian; Wang, Wen; Chen, Dongchu; Zhang, Yuyuan; Hu, Huawen; Ye, Xiufang

doi:10.1016/j.biortech.2017.08.101

Cited by 51 publications

(28 citation statements)

References 15 publications

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“…However, its fractionation effect is not as strong as with sodium hydroxide or ammonia [46]. For instance, under similar conditions, the use of sodium hydroxide led to lignin and hemicelluloses removal yields of 70 and 22%, respectively, whereas the use of calcium hydroxide led to lignin and hemicelluloses removal yields of 28 and 8%, respectively [29].…”

Section: Nature Of the Basementioning

confidence: 99%

“…In the frame of second-generation ethanol biorefinery, and similarly to acid fractionation processes [5], comparing the efficiency of various mild alkaline fractionation processes based on the dissolution of lignin and hemicelluloses is more relevant than comparing yields of saccharification or fermentation at the following process steps, since saccharification and fermentation conditions differ from one study to another. One might target high rates of solubilization, particularly for lignin, as they are coupled with high yields of saccharification at the next step [29,32,52] and it potentially allows the purification and valorization of larger quantities of lignin and hemicelluloses. Alkali fractionation conditions with sodium hydroxide at 0.5-10.0% (w/v) and with a solid:liquid ratio (S:L ratio) of 10-30% (w/v) at 60-180 • C during 5-60 min give generally about 50-80% dissolution rate for lignin and hemicelluloses (Table 1).…”

Section: Conditions and Yieldsmentioning

confidence: 99%

“…The solid residue (mainly cellulose) can be used in its polymeric form in an application such as paper and cellulose derivatives (e.g., cellulose acetate), or in its monomeric form (glucose), after acid or enzymatic hydrolysis of the β1-4 glycosidic bonds, in applications such as biofuels (ethanol) and chemical intermediates [4,17]. Less than 3% degradation of glucan (accounting for cellulose) was reported on mild alkaline extraction of sugarcane bagasse (SCB) [29,30]. Hemicelluloses are usually dissolved to a lower extent than lignin [4,16].…”

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Lignocellulosic Biomass Mild Alkaline Fractionation and Resulting Extract Purification Processes: Conditions, Yields, and Purities

2020

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Fractionation of lignocellulose is a fundamental step in the valorization of cellulose, hemicelluloses, and lignin to produce various sustainable fuels, materials and chemicals. Strong alkaline fractionation is one of the most applied processes since the paper industry has been using it for more than a century, and the mineral acid fractionation process is currently the most applied for the production of cellulosic ethanol. However, in the last decade, mild alkaline fractionation has been becoming increasingly widespread in the frame of cellulosic ethanol biorefineries. It leads to the solubilization of hemicelluloses and lignin at various extent depending on the conditions of the extraction, whereas the cellulose remains insoluble. Some studies showed that the cellulose saccharification and fermentation into ethanol gave higher yields than the mineral acid fractionation process. Besides, contrary to the acid fractionation process, the mild alkaline fractionation process does not hydrolyze the sugar polymers, which can be of interest for different applications. Lignocellulosic mild alkaline extracts contain hemicelluloses, lignin oligomers, phenolic monomers, acetic acid, and inorganic salts. In order to optimize the economic efficiency of the biorefineries using a mild alkaline fractionation process, the purification of the alkaline extract to valorize its different components is of major importance. This review details the conditions used for the mild alkaline fractionation process and the purification techniques that have been carried out on the obtained hydrolysates, with a focus on the yields and purities of the different compounds.Clean Technol. 2020, 2 92 (also known as Kraft) processes. These processes induce the dissociation of cellulose fibers from lignin and hemicelluloses by the cooking chemicals [8,9]. Kraft and soda processes rely on alkaline chemicals, the former being mainly used for wood hydrolysis, while the latter is commonly applied to non-wood biomass, such as bagasse, straw, grass or bamboo [9]. In both processes, lignin, low molecular weight hemicelluloses and other extractives from the wood are dissolved in what is called the black liquor [10]. The third process in the papermaking industry is the sulfite process, developed by Tilghman [11]. The wood chips are cooked in a mixture of sulfurous acid and bisulfide ions which dissolve lignin and hemicelluloses [12]. Sulfite pulps account for less than 10% of the total chemical pulp production [13].For decades, the black liquor was burnt to produce steam and electricity. The characterization, fractionation, and recovery of the compounds from black liquor in order to valorize them into materials and chemicals appeared only in the 1980s [14,15]. With the expansion of lignocellulosic biorefineries to produce other materials than paper -energy (liquid fuels like ethanol) and chemical intermediates -and the constraint of limiting the cost of the fractionation step, mild alkaline fractionation gained importance [16,17]. It also challenges the acid fra...

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Section: Nature Of the Basementioning

confidence: 99%

Section: Conditions and Yieldsmentioning

confidence: 99%

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confidence: 99%

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Lignocellulosic Biomass Mild Alkaline Fractionation and Resulting Extract Purification Processes: Conditions, Yields, and Purities

2020

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“…By glycerol pretreatment of sugarcane bagasse, the levoglucosan yield can be enhanced significantly. Sodium hydroxide was found to be more effective than lime as a catalyst in the glycerol pretreatment of sugarcane bagasse and in improving saccharification and lignin recovery; however, lime is much cheaper than NaOH. The advantages of alkali‐catalyzed organosolv fractionation over acid catalyzed process primarily lie on the less corrosion to the reactor, more efficient delignification and less degradation of sugars.…”

Section: Organosolv Fractionation Under Acidic Conditionsmentioning

confidence: 99%

High value‐added monomer chemicals and functional bio‐based materials derived from polymeric components of lignocellulose by organosolv fractionation

Zhang

Cai

Qin

et al. 2019

Biofuels Bioprod Bioref

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Organosolv fractionation (OF) is a promising method for lignocellulosic biomass biorefining to produce biofuels, biochemicals, and biomaterials. The fractionated polymeric components may be good feedstocks to produce bio‐based materials such as green polymers via chemical or biological conversion. However, related work to specify the bio‐based materials production via organosolv fractionation of lignocellulosic biomass is relatively scarce. In this work we have provided a comprehensive review of typical organosolv fractionation for isolating cellulose, hemicelluloses, and lignin, as well as the high value‐added monomer chemicals and functional materials derived from the fractionated components and their potential applications developed in recent years, primarily including the modified cellulose fibers for polymer materials, cellulose nanocrystals (CNCs), polysaccharide‐derived platform precursors for synthesis of bio‐based polymers, lignin‐derived dispersants, surfactants, carbon materials, and hemicellulose‐derived functional materials, etc. This work suggests that organosolv fractionation of lignocellulosic biomass could be a good entry to biomass refinery for high value‐added and functional materials production. However, there are still many challenges that should be overcome in terms of the fundamental, technical, and economic aspects for the organosolv fractionation process, formation of precursor compounds, synthesis of the bio‐based materials, design of product properties and functions, and the integration of the entire process. © 2019 Society of Chemical Industry and John Wiley & Sons, Ltd

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“…Various studies have shown that chemically pretreated materials perform much better in biogas production [22,23]. Sodium hydroxide (NaOH) is the most common agent for alkaline pretreatment, which is superior for improving hydrolysis compared with calcium hydroxide (Ca(OH) 2 ) [24][25][26]. A 33.3% increase in total methane production has been reported for 3.0% NaOH-treated poplar waste in four days with an 88% moisture content [27], and a 113.8% increase in methane yield has been shown in 5% NaOH-treated poplar processing residues [28].…”

Section: Introductionmentioning

confidence: 99%

Process optimization for the anaerobic digestion of poplar ( Populus L .) leaves

2020

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This study investigates the optimized condition for enhancing biogas production in the anaerobic digestion of fallen poplar leaves. Two experiments were conducted: (1) The calcium hydroxide concentration, bacteria concentration, and composting time were used as three parameters to optimize the fermentation pretreatment condition and contrasting tests were performed; and (2) a series of fermentation tests were conducted to explore the best process parameters and biogas production characteristics. The results showed that a biological and chemical combined pretreatment effectively improved the biogas productivity of poplar leaves as fermentation substrates, and the parameter that had the greatest effect during anaerobic digestion was temperature followed by the solid concentration and pH value. The optimal pretreatment condition was: alkali concentration 4.61%, bacterial concentration 0.20‰, and a composting time of 6.6 days. By considering the factors that affect the fermentation of poplar leaves and the cumulative gas production, the optimum condition for poplar leave digestion was found to be a temperature of 30°C, a pH of 7, and a 10% solid concentration. In addition, the methane yield of the optimized trial was well fitted using the modified Gompertz model. ARTICLE HISTORY

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Comparison of sodium hydroxide and calcium hydroxide pretreatments on the enzymatic hydrolysis and lignin recovery of sugarcane bagasse

Cited by 51 publications

References 15 publications

Lignocellulosic Biomass Mild Alkaline Fractionation and Resulting Extract Purification Processes: Conditions, Yields, and Purities

Lignocellulosic Biomass Mild Alkaline Fractionation and Resulting Extract Purification Processes: Conditions, Yields, and Purities

High value‐added monomer chemicals and functional bio‐based materials derived from polymeric components of lignocellulose by organosolv fractionation

Process optimization for the anaerobic digestion of poplar ( Populus L .) leaves

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