Loading...

Biofuel Alcohol Production from Agricultural Residues in a Slurry Bioreactor

Sattari, Behzad | 2010

818 Viewed
  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 41383 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Vossoughi, Manoochehr; Alemzadeh, Iran
  7. Abstract:
  8. Nowadays bioethanol is one of the main factors in the fuel market. It is currently produced from sugars and starchy materials, but lignocelluloses can be expected to be major feedstocks for ethanol production in the future. Agricultural residues such as wheat straw are being considered a potential lignocellulose raw material for fuel-ethanol production as an alternative to starch or sugar-containing feedstock. In order to produce bioethanol, it is necessary to decompose the wheat straw into soluble sugars. But lignocellulosic materias needs pretreatment before hydrolysis and fermentation. The main goal of pretreatment is to increase the enzyme accessibility improving digestibility of cellulose. Different acid and alkali pretreatments were used to select the maximum sugar and alcohol yields. A rotatable central composite design of response surface method was used to optimize H2SO4-catalyzed hydrothermal pretreatment of wheat straw, in respect to acid concentration (0.5–2.5%), treatment time (10–30 min) and temperature (120–160°C). A high pressure reactor with advanced heating-cooling system was used for dilute-acid pretreatment. Based on the type of dilute acid pretreatment applied, a xylosw yield of 10-90% and glucose yield down to 50% was achieved. Enzymatic hydrolysis after dilute acid pretreatment was also measured to evaluate the optimal pretreatment conditions for maximizing sugar recovery. Two kind of cellulose enzyme, Cellusoft CR and Celluclast 1.5L were used for saccarification. Optimum conditions based on maximize sugar recovery and minimize inhibitor production were: 30 minutes retention time, 1.53% acid concentration and 147ºC. With combining a special acid and alkali pretreatment and was objected pretreatment biomass to SSF process a maximum of 10.7 g/l ethanol was achieved
  9. Keywords:
  10. Bioethanol ; Wheat Straw ; Sugars ; Cellulose ; Lignocellulosic ; Central Composite Design ; Pretreatment

 Digital Object List

 Bookmark

No TOC