A comparison of pretreatment methods for bioethanol production from lignocellulosic materials

Conde‐Mejía, Carolina; Jiménez‐Gutiérrez, Arturo; El‐Halwagi, Mahmoud M.

doi:10.1016/j.psep.2011.08.004

Cited by 172 publications

(81 citation statements)

References 32 publications

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“…A major demerit of this process is its requirement of special corrosion-resistant reactors which are usually expensive both in investment and operation [72], compared to other chemical (e.g., dilute alkali) and physicochemical (e.g., steam explosion and AFEX) methods [13,73]. The energy consumption of the process and the cost of the acid [74] as well as performance limitations based on particle size (a few millimetres) and solids concentration (≤30%) contribute significantly to the overall cost [14]. Dilute acids are less effective in removing lignin compared to alkaline methods.…”

Section: International Journal Of Chemical Engineeringmentioning

confidence: 99%

Chemical Pretreatment Methods for the Production of Cellulosic Ethanol: Technologies and Innovations

Bensah

Mensah

2013

International Journal of Chemical Engineering

268

105

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Pretreatment of lignocellulose has received considerable research globally due to its influence on the technical, economic and environmental sustainability of cellulosic ethanol production. Some of the most promising pretreatment methods require the application of chemicals such as acids, alkali, salts, oxidants, and solvents. Thus, advances in research have enabled the development and integration of chemical-based pretreatment into proprietary ethanol production technologies in several pilot and demonstration plants globally, with potential to scale-up to commercial levels. This paper reviews known and emerging chemical pretreatment methods, highlighting recent findings and process innovations developed to offset inherent challenges via a range of interventions, notably, the combination of chemical pretreatment with other methods to improve carbohydrate preservation, reduce formation of degradation products, achieve high sugar yields at mild reaction conditions, reduce solvent loads and enzyme dose, reduce waste generation, and improve recovery of biomass components in pure forms. The use of chemicals such as ionic liquids, NMMO, and sulphite are promising once challenges in solvent recovery are overcome. For developing countries, alkalibased methods are relatively easy to deploy in decentralized, low-tech systems owing to advantages such as the requirement of simple reactors and the ease of operation.

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Section: International Journal Of Chemical Engineeringmentioning

confidence: 99%

Chemical Pretreatment Methods for the Production of Cellulosic Ethanol: Technologies and Innovations

Bensah

Mensah

2013

International Journal of Chemical Engineering

268

105

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“…Furthermore, it is a promising technology in that it consumes less energy than steam explosion, reducing the energy requirements of the pre-treatment step, which is critical to developing viable cellulosic ethanol biorefineries at an industrial scale. Improvements can be made to the SS pre-treatment in order to improve the overall yield from the biomass, which is still comparatively low with regards to other pretreatment technologies (Conde-Mejia et al, 2012). Hypothetically, increasing the process efficiency to 80% through optimization and addition of catalysts could further decrease the energy consumption by approximately 38%, with only a modest increase in process cost associated with catalyst (0.01$/L ethanol) if the chemical demand is similar to steam explosion.…”

Section: Resultsmentioning

confidence: 99%

Process analysis of superheated steam pre-treatment of wheat straw and its relative effect on ethanol selling price

Barchyn¹,

Cenkowski²

2014

Biofuel Res. J.

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Please cite this article as: Barchyn D., Cenkowski S. Process analysis of superheated steam pre-treatment of wheat straw and its relative effect on ethanol selling price. Biofuel Research Journal 4 (2014) 123-138.. Biofuel Research Journal 4 (2014) Existing bioethanol operations rely on starch-based substrates, which have been criticized for their need to displace food crops in order to be produced. As an alternative to these first generation biofuels, the use of agricultural residues is being considered to create more environmentally-benign second generation, or cellulosic biofuels. Recalcitrance of these substrates to fermentation requires extensive pre-treatment processes, which often consume more energy than can be extracted from the ethanol that they produce, so one of the priorities in developing cellulosic ethanol is an effective and efficient pre-treatment method. This study examines the use of superheated steam (SS) as a process medium by which wheat straw lignocellulosic material is pre-treated. Following enzymatic hydrolysis, it was found that 47% of the total glucose could be liberated from the substrate, and the optimal conditions for pre-treatment were 15 min in hot water (193 kPa, 119˚C) followed by 2 min in SS. Furthermore, a preliminary relative economic analysis showed that the minimum ethanol selling price (MESP) was comparable to that obtained from steam explosion, a similar process, while energy consumption was 22% less. The conclusion of the study is that SS treatment stands to be a competitive pre-treatment technology to steam explosion.

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“…Significant effort has been invested in the conversion of lignocellulosic biomass into platform chemicals as well as further upgrading to biofuels [1][2][3]. Lignocellulosic biomass, which is generally sourced from wood and agricultural wastes, is mainly composed of cellulose, hemicellulose, and lignin.…”

Section: Introductionmentioning

confidence: 99%

Deacetylation Followed by Fractionation of Yellow Poplar Sawdust for the Production of Toxicity-Reduced Hemicellulosic Sugar for Ethanol Fermentation

Kim

2018

Energies

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Abstract:In order to produce bioethanol from yellow poplar sawdust without detoxification, deacetylation (mild alkali treatment) was performed with aqueous ammonia solution. To select the optimal conditions, deacetylation was carried out under different conditions: NH 4 OH loading (2-10% (w/v)) and a solid-to-liquid ratio of 1:4-1:10 at 121 • C for 60 min. In order to assess the effectiveness of deacetylation, fractionation of deacetylated yellow poplar sawdust was performed using dilute acid (H 2 SO 4 , 0.5-2.0% (w/v)) at a reaction temperature of 130-150 • C for 10-80 min. The toxicity-reduced hemicellulosic hydrolyzates that were obtained through a two-step treatment at optimized conditions were fermented using Pichia stipitis for ethanol production, without any further detoxification. The maximum ethanol production was 4.84 g/L, corresponding to a theoretical ethanol yield of 82.52%, which is comparable to those of intentionally made hydrolyzates as controls.

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A comparison of pretreatment methods for bioethanol production from lignocellulosic materials

Cited by 172 publications

References 32 publications

Chemical Pretreatment Methods for the Production of Cellulosic Ethanol: Technologies and Innovations

Chemical Pretreatment Methods for the Production of Cellulosic Ethanol: Technologies and Innovations

Process analysis of superheated steam pre-treatment of wheat straw and its relative effect on ethanol selling price

Deacetylation Followed by Fractionation of Yellow Poplar Sawdust for the Production of Toxicity-Reduced Hemicellulosic Sugar for Ethanol Fermentation

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