Comparison of steam and ammonia pretreatment for enzymatic hydrolysis of cellulose

Mes-Hartree, M.; Dale, Bruce E.; Craig, Wayne

doi:10.1007/bf00269069

Cited by 95 publications

(43 citation statements)

References 9 publications

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“…A wide variety of chemicals have been suggested in the literature and these include sodium hydroxide [19][20][21] , sulfur dioxide [22][23][24][25][26] , aqueous ammonia 27,28 , calcium hydroxide plus calcium carbonate 27 , phosphoric acid [29][30][31] , alkaline hydrogen peroxide 32 , inorganic salts with acidic properties 33 , ammonium salts 21,33,34 , Lewis acids and organic acid anhydrides 34 , acetic acid 21,33,34 , formic acid 33 , sulfuric acid [35][36][37] , n-butylamine 38 , n-propylamine 39 and alcohols (methanol, ethanol or butanol) in the presence of an acid or alkaline catalyst 40 .…”

Section: Pretreatment Of Lignocellulosicsmentioning

confidence: 99%

The chemistry involved in the steam treatment of lignocellulosic materials

Ramos¹

2003

Quím. Nova

540

217

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Recebido em 16/8/02; aceito em 15/5/03Pretreatment of lignocellulosic materials is essential for bioconversion because of the various physical and chemical barriers that greatly inhibit their susceptibility to bioprocesses such as hydrolysis and fermentation. The aim of this article is to review some of the most important pretreatment methods developed to date to enhance the conversion of lignocellulosics. Steam explosion, which precludes the treatment of biomass with high-pressure steam under optimal conditions, is presented as the pretreatment method of choice and its mode of action on lignocellulosics is discussed. The optimal pretreatment conditions for a given plant biomass are defined as those in which the best substrate for hydrolysis is obtained with the least amount of soluble sugars lost to side reactions such as dehydration. Therefore, pretreatment optimization results from a compromise between two opposite trends because hemicellulose recovery in acid hydrolysates can only be maximized at lower pretreatment severities, whereas the development of substrate accessibility requires more drastic pretreatment conditions in which sugar losses are inevitable. To account for this heterogeneity, the importance of several process-oriented parameters is discussed in detail, such as the pretreatment temperature, residence time into the steam reactor, use of an acid catalyst, susceptibility of the pretreated biomass to bioconversion, and process design.

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Section: Pretreatment Of Lignocellulosicsmentioning

confidence: 99%

The chemistry involved in the steam treatment of lignocellulosic materials

Ramos¹

2003

Quím. Nova

540

217

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“…In this process, the material undergoes the attack of liquid ammonia at high temperature and pressure and later a quick decompression is carried out. This process does not generate inhibitors of the fermentation (Mes-Hartree et al, 1988).…”

Section: Introductionmentioning

confidence: 96%

Sugar cane bagasse prehydrolysis using hot water

Abril

Medina

Abril

2012

Braz. J. Chem. Eng.

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-Results are presented on the hot water prehydrolysis of sugar cane bagasse for obtaining ethanol by fermentation. The experimental study consisted of the determination of the effect of temperature and time of prehydrolysis on the extraction of hemicelluloses, with the objective of selecting the best operating conditions that lead to increased yield of extraction with a low formation of inhibitors. The study, carried out in a pilot plant scale rotational digester, using a 3 2 experimental design at temperatures of 150-190°C and times of 60-90 min, showed that it is possible to perform the hot water prehydrolysis process between 180-190°C in times of 60-82 min, yielding concentrations of xylose ≥ 35 g/L, furfural ≤ 2.5 g/L, phenols from soluble lignin ≤ 1.5 g/L, and concentrations ≤ 3.0 g/L of hemicelluloses in the cellolignin residue. These parameters of temperature and prehydrolysis time could be used for the study of the later hydrolysis and fermentation stages of ethanol production from sugar cane bagasse.

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“…Examples include physical (e.g., limited pyrolysis and mechanical disruption/comminution, Mosier et al, 2005), physicochemical (e.g., steam explosion, ammonia fiber explosion, Grous et al, 1986;Mes-Hartree et al, 1988), chemical (e.g., acid hydrolysis, alkaline hydrolysis, high temperature organic solvent pretreatment, oxidative delignification, Chum et al, 1988;Gierer and Noren, 1982;Zhang et al, 2007), and biological (e.g., lignin degradation by white-and soft-rot fungi, Hatakka, 1983;Lee, 1997) methods. In all cases, upon sufficient removal of the lignin, there was also substantial degradation of lignin and in many cases there was substantial loss in fermentable sugar content of the residual polysaccharides (Galbe and Zacchi, 2007).…”

Section: Introductionmentioning

confidence: 99%

Ionic liquid‐mediated selective extraction of lignin from wood leading to enhanced enzymatic cellulose hydrolysis

Lee

Doherty

Linhardt

et al. 2008

Biotech & Bioengineering

848

571

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Lignocellulose represents a key sustainable source of biomass for transformation into biofuels and bio-based products. Unfortunately, lignocellulosic biomass is highly recalcitrant to biotransformation, both microbial and enzymatic, which limits its use and prevents economically viable conversion into value-added products. As a result, effective pretreatment strategies are necessary, which invariably involves high energy processing or results in the degradation of key components of lignocellulose. In this work, the ionic liquid, 1-ethyl-3-methylimidazolium acetate ([Emim][CH 3 COO]), was used as a pretreatment solvent to extract lignin from wood flour. The cellulose in the pretreated wood flour becomes far less crystalline without undergoing solubilization. When 40% of the lignin was removed, the cellulose crystallinity index dropped below 45, resulting in >90% of the cellulose in wood flour to be hydrolyzed by Trichoderma viride cellulase. [Emim] [CH 3 COO] was easily reused, thereby resulting in a highly concentrated solution of chemically unmodified lignin, which may serve as a valuable source of a polyaromatic material as a value-added product.

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Comparison of steam and ammonia pretreatment for enzymatic hydrolysis of cellulose

Cited by 95 publications

References 9 publications

The chemistry involved in the steam treatment of lignocellulosic materials

The chemistry involved in the steam treatment of lignocellulosic materials

Sugar cane bagasse prehydrolysis using hot water

Ionic liquid‐mediated selective extraction of lignin from wood leading to enhanced enzymatic cellulose hydrolysis

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