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Optimisation of dilute-acid pretreatment conditions forenhancement sugar recovery and enzymatic hydrolysis ofwheat straw

Satari Baboukani, B ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1016/j.biosystemseng.2011.11.009
  3. Abstract:
  4. In order to produce bioethanol from agricultural residues such as wheat straw, the decomposition lignocellulosic materials into soluble sugars is necessary. This work focused on the influence of dilute sulphuric acid pretreatment conditions on sugar removal and the enzymatic saccharification of wheat straw. Response surface methodology (RSM) based on rotatable central composite design (RCCD) was used to optimise H 2SO 4-catalysed hydrothermal pretreatment of wheat straw, in respect to acid concentration (0.75-2.25%), treatment time (10-30min) and temperature (120-160°C). The pretreated wheat straw was hydrolysed by a standard blend of Cellusoft CR ®. Enzymatic hydrolysis was also measured to evaluate the optimal pretreatment conditions for maximising sugar recovery. The optimum values of factors for enhancing sugar recovery in pretreatment, and consequently enzyme hydrolysis, were: retention time 30min, acid concentration 1.6% and temperature 147°C. The results showed that temperature was more significant than acid concentration and treatment time for enhancement of xylose release and cellulose digestion
  5. Keywords:
  6. Acid concentrations ; Cellulose digestion ; Central composite designs ; Dilute-acid ; Enzymatic saccharification ; Enzyme hydrolysis ; Hydrothermal pretreatment ; Lignocellulosic material ; Optimisations ; Optimum value ; Pre-treatment ; Pretreatment conditions ; Response surface methodology ; Retention time ; Soluble sugars ; Sugar recovery ; Treatment time ; Wheat straws ; Agricultural wastes ; Ethanol ; Optimization ; Recovery ; Saccharification ; Sugars ; Sulfuric acid ; Enzymatic hydrolysis ; Enzymolysis ; Plant residues ; Pretreatment ; Sugar ; Wheat straw ; Triticum aestivum
  7. Source: Biosystems Engineering ; Volume 111, Issue 2 , 2012 , Pages 166-174 ; 15375110 (ISSN)
  8. URL: http://www.sciencedirect.com/science/article/pii/S1537511011002042