Pretreatment of lignocellulosic wastes for biofuel production: A critical review

Kumari, Dolly; Singh, Radhika

doi:10.1016/j.rser.2018.03.111

Cited by 626 publications

(229 citation statements)

References 113 publications

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“…Steam explosion has been demonstrated to be more effective than other pretreatments. Some of the researches are showing a combination of pretreatment methods to improve delignification . Some examples of effectiveness are commented in Table .…”

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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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%

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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“…Comminuting of the lignocellulosic biomass through disintegration, flaking, crushing, or grinding is an important step in the pretreatment process. The extrusion process involves making the feedstock pass through heating, mixing, and shearing, leading to physical and chemical changes . The main purpose of the mechanical method is the reduction in the particle size and crystallinity of the lignocellulosic material so as to increase the surface area and the degree of polymerization to be reduced as well.…”

Section: Cellulosic Biomass Capacity For Bioethanol Production In Nigmentioning

confidence: 99%

“…This technique for pretreatment is highly efficient and is done by compressing the lignocellulosic biomass with steam; this is then followed by explosive decompression. It involves the lignocellulosic material being fused in high‐pressure steam of about 709.3–5066 kPa at a temperature of 160–190°C, followed by a sharp reduction of pressure, resulting in the rupture of the lignocellulosic material . This results in marshy solid material with a disordered lignocellulosic compound (cellulignin) and a liquid phase that can be removed by explosion.…”

Section: Cellulosic Biomass Capacity For Bioethanol Production In Nigmentioning

confidence: 99%

“…In another work, the liquid hot‐water pretreatment process, also called thermohydrolysis, involved the showering of the lignocellulosic biomass with hot water at a high pressure, at a temperature of about 220°C for close to 2 min. It should, however, be noted that, as compared to the steam‐explosion process, the efficiency of this method of biomass pretreatment is low …”

Section: Cellulosic Biomass Capacity For Bioethanol Production In Nigmentioning

confidence: 99%

“…Ethanol is then produced by fermentation using yeast or bacteria as a catalyst. The ethanol that is produced will then be made to go through the process of normal atmospheric distillation and other complex purification systems like pervaporation and reverse osmosis, which are novel separation processes developed from intensive research …”

Section: Cellulosic Biomass Capacity For Bioethanol Production In Nigmentioning

confidence: 99%

See 2 more Smart Citations

Harnessing the potential of bio‐ethanol production from lignocellulosic biomass in Nigeria – a review

Awoyale

Lokhat

2018

Biofuels Bioprod Bioref

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The need to diversify energy sources and to change from the present non‐renewable hydrocarbon sources to renewable energy sources has prompted huge investments in research activities to produce bioethanol from carbohydrate‐rich foodstuffs such as cassava tuber, sugarcane molasses, yam tubers, rice grains, corn grains, and a host of others. In recent times, however, more attention has been given to producing bioethanol from the non‐edible parts of carbohydrate‐rich foodstuffs, which are obtained mainly as waste products from food‐crop processing. Such non‐edible components include peels, bagasse, straw, stalk, and cobs. The most important component of the biomass is lignocellulose, which is broken down into carbohydrates and then fermented. The major challenge in deploying biomass as feedstock for bioethanol production is the fact that lignocellulosic biomass is highly recalcitrant and therefore requires more vigorous pretreatment prior to saccharification and fermentation. The main techniques used for pretreating lignocellulosic materials are physical and thermal as well as chemical and biological methods. In Nigeria, lignocellulosic bioethanol production potential from agricultural residues amounts to about 7.556 × 109 L per annum with more than 62% generated from process residues. Cassava biomass alone can produce more than 114 L of bioethanol for every ton of cassava peels after processing. Nigeria has more than enough agricultural residues for bioethanol production to meet its sustainable bioethanol‐blending demands. © 2018 Society of Chemical Industry and John Wiley & Sons, Ltd.

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Bioelectricity Production from Lignocellulosic Biomass

Das

Basumatary

Kalita

et al. 2020

Lignocellulosic Biorefining Technologies

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Pretreatment of lignocellulosic wastes for biofuel production: A critical review

Cited by 626 publications

References 113 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

Harnessing the potential of bio‐ethanol production from lignocellulosic biomass in Nigeria – a review

Bioelectricity Production from Lignocellulosic Biomass

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