Lignocellulose pretreatment: A comparison of wet and dry ball attrition

Rivers, Douglas B.; Emert, George H.

doi:10.1007/bf01025806

Cited by 56 publications

(23 citation statements)

References 6 publications

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“…Physical pretreatments, such as milling 41 and microwave irradiation 42 , have also been utilised to enhance the hydrolyzability of lignocellulosic materials 3 . However, the major disadvantage of these methods is the high energy requirement.…”

Section: Pretreatment Of Lignocellulosicsmentioning

confidence: 99%

“…Superior recovery yield of pretreated materials and better substrates for hydrolysis have been obtained from lignocellulosic residues using steam rather than sodium hydroxide 19 , alkaline hydrogen peroxide 54,59 , nitric acid 47 , calcium hydroxide 60 , alkaline organosolv 40 , sulfur dioxide 22 , full soda cook, aqueous phenol and calcium hydroxide plus sodium carbonate 27 . Steam explosion has also been compared to other methods used for pretreating wood residues, such as microwave irradiation 41 , milling 47 , dilute sulfuric acid hydrolysis 61 and ammonia pretreatment 62 , and demonstrated to be more effective. Three other methods have been described as suitable alternatives to high pressure steaming, particularly when pretreatment is followed by the simultaneous saccharification and fermentation (SSF) 63 of the substrate.…”

Section: Steam Pretreatment (Steam Explosion)mentioning

confidence: 99%

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The chemistry involved in the steam treatment of lignocellulosic materials

Ramos¹

2003

Quím. Nova

543

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%

Section: Steam Pretreatment (Steam Explosion)mentioning

confidence: 99%

The chemistry involved in the steam treatment of lignocellulosic materials

Ramos¹

2003

Quím. Nova

543

217

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“…There are various techniques used for the comminution of biomass, including dry, wet and vibratory ball milling [25,26] and compression milling [27]. However, where the smallest particle sizes are required, as in some dilute acid pre-treatment processes and in entrained flow gasifiers, the energy costs required may account for up to a third of the total energy demand of the biorefinery [28].…”

Section: Size-reductionmentioning

confidence: 99%

An examination of biorefining processes, catalysts and challenges

Hayes¹

2009

Catalysis Today

304

188

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“…Quando se considera a produção de biocombustíveis, o fato de a secagem permitir a estocagem da biomassa por longos períodos, facilitar o transporte e facilitar a cominuição desta em moinhos comumente usados em escalas industriais, percebe-se que esta estratégia torna-se interessante, mesmo que as etapas seguintes sejam a reidratação do material para a produção de açúcares via processos biológicos (Rivers et al, 1987;Digman et al, 2010;Ewanick et al, 2011).…”

Section: Introductionunclassified

Efeito Da Secagem De Brachiaria Brizantha Cv. Marandu Sobre a Hidrólise Enzimática De Seus Polissacarídeos

Carvalho¹,

Carvalho²,

Gambetta³

et al. 2015

Anais Do XX Congresso Brasileiro De Engenharia Química

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RESUMO -A eficácia da hidrólise enzimática da biomassa é influenciada pela umidade da amostra. Alguns pré-tratamentos químicos podem reduzir/eliminar este efeito. O objetivo deste trabalho foi avaliar o efeito de secagem sobre o pré-tratamento químico e hidrólise enzimática de brachiaria brizantha. A biomassa foi moída e a umidade determinada, 65%, e uma parte desta foi seca até 5% de umidade. Cada uma destas amostras foi submetida à pré-tratamentos fraco (ácido e base diluídos) e forte (ácido e base concentrados) e depois submetidas à hidrólise enzimática. Os resultados comprovaram que a secagem da biomassa desfavorece a hidrólise, pois o rendimento de açúcares foi de 35 % para a amostra úmida e 2 % para amostra seca. Após pré-tratamento fraco o rendimento para amostra seca, 70 %, foi maior do que na amostra úmida, 59 %. Quando pré-tratamento forte foi aplicado, os rendimentos de hidrólise para amostras úmida (95 %) e seca (92 %) tornaram-se similares. Concluiu-se que o processo de secagem da biomassa não influencia o rendimento de açúcares da hidrólise enzimática se um pré-tratamento químico adequado for aplicado.

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Lignocellulose pretreatment: A comparison of wet and dry ball attrition

Cited by 56 publications

References 6 publications

The chemistry involved in the steam treatment of lignocellulosic materials

The chemistry involved in the steam treatment of lignocellulosic materials

An examination of biorefining processes, catalysts and challenges

Efeito Da Secagem De Brachiaria Brizantha Cv. Marandu Sobre a Hidrólise Enzimática De Seus Polissacarídeos

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