Fermentability of the hemicellulose-derived sugars from steam-exploded softwood (douglas fir)

Boussaid, Abdel; Robinson, Jamie; Cai, Yijin; Gregg, David J.; Saddler, John N.

doi:10.1002/(sici)1097-0290(19990805)64:3<284::aid-bit4>3.0.co;2-c

Cited by 102 publications

(46 citation statements)

References 16 publications

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“…As a result, the addition of SO 2 as an acid catalyst was shown to be only beneficial for hardwoods 23,24,26 but litteraly essential for softwoods such as spruce 24,26 , radiata pine 104 and Douglas fir 105 . In these studies, SO 2 impregnation was achieved by injecting anhydrous SO 2 gas into plastic bags containing the chips and the amount of retained SO 2 was expressed in relation to the chips dry weight.…”

Section: Steam Pretreatment (Steam Explosion)mentioning

confidence: 99%

The chemistry involved in the steam treatment of lignocellulosic materials

Ramos¹

2003

Quím. Nova

546

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: Steam Pretreatment (Steam Explosion)mentioning

confidence: 99%

The chemistry involved in the steam treatment of lignocellulosic materials

Ramos¹

2003

Quím. Nova

546

217

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“…Chemical pre-treatment could focus on the use of cheaper swelling agents such as sodium hydroxide, hydrazine and anhydrous ammonia. The effectiveness of pre-treatment alternatives is often dictated by feedstock characteristics (i.e., Wood and Saddler 1988, Boussaid et al 1999, Mosier et al 2005, and it seems likely that ultimate pre-treatment selection will be based on the inherent advantages/disadvantages associated with specific feedstocks; for the Canadian forest sector, two pre-treatments of particular interest are steam-explosion pre-treatment and organosolv pre-treatment (Chandra et al 2007). Woody biomass pre-treatment technologies are at varying stages of commercial development, and require significant capital investment at this time.…”

Section: Technical Challenges With Bioconversionmentioning

confidence: 99%

Energy from forest biomass in Ontario: Getting beyond the promise

Mabee¹,

Mirck²,

Chandra³

2011

The Forestry Chronicle

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The recent decline in Ontario's forest sector has resulted in the idling or closure of many mills, creating an opportunity for forest-derived bioenergy supported by the Ontario Green Energy and Green Economy Act. Combined heat and power production from forest biomass seems to provide an optimal balance between energy supplied and employment opportunities. This option could provide Ontario with 5.3% of electricity and 1.5% of heat energy needs. The province could sustainably support up to 12 60-MW installations. Five key recommendations are advanced, including the need for a bioenergy strategy within the province, options for developing funding for this sector, and the possibility of creating a bioenergy network using existing research assets within Ontario.

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“…The process employs high pressure steam with temperature typically ranging from 160 to 260 °C for few minutes. This is followed by explosive decompression of biomass (Banerjee et al, 2010;Boussaid et al, 1999;Sun et al, 2004;Varga et al 2004). A number of studies have been already reported in literature describing positive effects in terms of enhancing the enzymatic hydrolizability of several materials (hardwood and softwood, corn stover, straws etc.)…”

Section: Fig 2 Main Steps Of Bioethanol Production From Lignocellulmentioning

confidence: 99%