Effects of impregnation of softwood with sulfuric acid and sulfur dioxide on chemical and physical characteristics, enzymatic digestibility, and fermentability

Zhao, Wang; Wu, Guochao; Jönsson, Leif J.

doi:10.1016/j.biortech.2017.09.081

Cited by 46 publications

(30 citation statements)

References 25 publications

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“…Superior recovery yield of pretreated lignocellulosic materials over several other pretreatment options has been obtained using steam rather than sodium hydroxide (NaOH), calcium hydroxide (Ca (OH) 2 ) plus sodium carbonate (NaHCO 3 ), alkaline hydrogen peroxide, alkaline organosolv sulfur dioxide (SO 2 ), sodium bicarbonate (NaHCO 3 ), and aqueous phenol (C 6 H 5 OH). The efficiency of steam explosion has been evaluated by other methods used for pretreatment of wood residues, such as milling, dilute sulfuric acid hydrolysis, and ammonia pretreatment. Steam explosion has been demonstrated to be more effective than other pretreatments.…”

Section: Organic Solventsmentioning

confidence: 99%

“…Ramos et al suggested that the explosion is only desirable when hardwood chips with low moisture content are used. Wang et al used sulfur dioxide (SD) and higher temperatures in the pretreatment of spruce wood which caused increased inhibition of both enzymatic and microbial biocatalysts, and formation of pseudo‐lignin was also increased. Despite that, the authors also claimed that spruce pretreated with SD at high temperatures exhibited superior digestibility.…”

Section: Organic Solventsmentioning

confidence: 99%

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Future prospects of delignification pretreatments for the lignocellulosic materials to produce second generation bioethanol

Baig

Turcotte

2019

Int J Energy Res

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Summary Production of bioethanol is winning support from masses because it is a workable choice to solve the problems associated with the fluctuating prices of crude petroleum oil, climatic change, and reducing non‐renewable fuel reserves. First‐generation biofuels are produced directly from food crops. The biofuel (bioethanol, biodiesel) is ultimately derived from the starch, sugar, animal fats, and vegetable oil that these crops provide. It is important to note that the structure of the biofuel itself does not change between generations, but rather the source from which the fuel is derived changes. Corn, wheat, and sugar cane are the most commonly used first‐generation bioethanol feed stocks. Lignocellulosic materials are used as a feed stock for the production of second‐generation bioethanol. The major production steps are (1) delignification, (2) depolymerisation, and (3) fermentation. Agricultural residues are waste materials produced through the processing of agricultural crops. The main reason to use of these agricultural residues to produce bioethanol is to convert waste to value added products. The main challenges are the low yield of the cellulosic hydrolysis process due to the presence of lignin and hemicellulose with cellulose. Pretreatments of lignocellulosic materials to remove lignin and hemicellulose are the techniques used to enhance the hydrolysis. Present review article comprehensively discusses the different pretreatment methods of delignification for ethanol production. Published literature on pretreatments from 1982 to 2018 has been studied. Perspectives, gaps in studies, and recommendations are given to fully describe implementation of eight prominent pretreatments (milling, pyrolysis, organic solvents, steam explosion, hot water treatments, ozonolysis, enzymatic delignification, and genetic modification) for future research. The energy and environmental features of lignocellulosic materials are elaborated to show a sustainable aspect of second‐generation biofuel. It was felt necessary to discuss the concept of bio refinery to make biofuel production financially more attractive as well because the future prospects of second‐generation biofuel are promising.

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Section: Organic Solventsmentioning

confidence: 99%

Section: Organic Solventsmentioning

confidence: 99%

Future prospects of delignification pretreatments for the lignocellulosic materials to produce second generation bioethanol

Baig

Turcotte

2019

Int J Energy Res

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“…However, xylan is more susceptible to acid hydrolysis than is cellulose, and it is the hemicelluloses that are the main target for hydrothermal pretreatment under acidic conditions. If acid catalysts such as sulfuric acid and sulfur dioxide are included in the pretreatment, the result may be almost quantitative degradation of the hemicellulose, even for the most recalcitrant forms of lignocellulose, such as softwood [43]. Therefore, the effects of adding hemicellulases to the reaction mixture are related to both the feedstock and the type and the severity of the pretreatment.…”

Section: Enzymatic Saccharification Of Lignocellulosic Feedstocksmentioning

confidence: 99%

“…Research laboratories with focus on assessment of lignocellulosic feedstocks for biofuel production use analytical enzymatic saccharification to screen large sets of samples. Figure 1 and Table 2 provide an overview of different approaches to analytical-scale saccharification [43,. The main intention of analytical-scale studies is to use small amounts of biomass to screen many samples and parameters, for example with regard to comparison of different feedstocks, genetic modifications, environmental variants, different parts of plants, and different pretreatment methods.…”

Section: Pretreatment and Enzymatic Saccharificationmentioning

confidence: 99%

“…The approaches differ with regard to potential separation of the solid and liquid phases after pretreatment (Figure 1, Table 2). In some studies, the solids have been collected by centrifugation and thoroughly washed and neutralized with water and buffer [43,47,48,[54][55][56][57][58][59][60]71,73], while in other studies there has only been a neutralization step using concentrated buffer to adjust the pH prior to the enzymatic digestion step ( Table 2). Separation and washing is laborious, but the advantage is that more detailed information can be gathered from the experiment.…”

Section: Pretreatment and Enzymatic Saccharificationmentioning

confidence: 99%

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Analytical Enzymatic Saccharification of Lignocellulosic Biomass for Conversion to Biofuels and Bio-Based Chemicals

2018

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Lignocellulosic feedstocks are an important resource for biorefining of renewables to bio-based fuels, chemicals, and materials. Relevant feedstocks include energy crops, residues from agriculture and forestry, and agro-industrial and forest-industrial residues. The feedstocks differ with respect to their recalcitrance to bioconversion through pretreatment and enzymatic saccharification, which will produce sugars that can be further converted to advanced biofuels and other products through microbial fermentation processes. In analytical enzymatic saccharification, the susceptibility of lignocellulosic samples to pretreatment and enzymatic saccharification is assessed in analytical scale using high-throughput or semi-automated techniques. This type of analysis is particularly relevant for screening of large collections of natural or transgenic varieties of plants that are dedicated to production of biofuels or other bio-based chemicals. In combination with studies of plant physiology and cell wall chemistry, analytical enzymatic saccharification can provide information about the fundamental reasons behind lignocellulose recalcitrance as well as about the potential of collections of plants or different fractions of plants for industrial biorefining. This review is focused on techniques used by researchers for screening the susceptibility of plants to pretreatment and enzymatic saccharification, and advantages and disadvantages that are associated with different approaches.

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Subproducts and Inhibitors

Treichel

Fongaro

Scapini

et al. 2019

Utilising Biomass in Biotechnology

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Effects of impregnation of softwood with sulfuric acid and sulfur dioxide on chemical and physical characteristics, enzymatic digestibility, and fermentability

Cited by 46 publications

References 25 publications

Future prospects of delignification pretreatments for the lignocellulosic materials to produce second generation bioethanol

Future prospects of delignification pretreatments for the lignocellulosic materials to produce second generation bioethanol

Analytical Enzymatic Saccharification of Lignocellulosic Biomass for Conversion to Biofuels and Bio-Based Chemicals

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