Does densification influence the steam pretreatment and enzymatic hydrolysis of softwoods to sugars?
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- 作者：Linoj Kumar ; Zahra Tooyserkani ; Shahab Sokhansanj ; Jack N Saddler
- 关键词：Steam pretreatment ; Pelletisation ; Enzymatic hydrolysis ; Softwoods ; Lignin
- 刊名：Bioresource Technology
- 出版年：2012
- 出版时间：October, 2012
- 年：2012
- 卷：121
- 期：Complete
- 页码：190-198
- 全文大小：831 K
文摘
The global trade in wood pellets continues to grow. However, their potential as a feedstock for large scale cellulosic ethanol production has not been evaluated. We anticipated that the reduced moisture content and pressure exerted on the wood biomass during the pelletisation process would result in some carbohydrate loss as well as making the biomass more recalcitrant to pretreatment and subsequent hydrolysis. However, when softwood chips and pellets were steam pretreated at medium severity, little hemicellulose loss occurred while more than two-thirds of the cellulose present in the cellulose rich water insoluble fractions were hydrolysed (at 20 FPU cellulase/g cellulose). In addition, prior steaming substantially reduced the particle size of the wood chips enabling direct pelletisation without the need for grinding. Surprisingly, it was also possible to apply a single steam pretreatment to facilitate both pelletisation and subsequent enzymatic hydrolysis without the need for a further pretreatment step.