Comparison of SO2 and H2SO4 impregnation of softwood prior to steam pretreatment on ethanol production

  • Charlotte Tengborg
  • Kerstin Stenberg
  • Mats Galbe
  • Guido Zacchi
  • Simona Larsson
  • Eva Palmqvist
  • Bärbel Hahn-Hägerdal
Session 1: Feedstock Supply and Processing

DOI: 10.1007/BF02920119

Cite this article as:
Tengborg, C., Stenberg, K., Galbe, M. et al. Appl Biochem Biotechnol (1998) 70: 3. doi:10.1007/BF02920119

Abstract

The pretreatment of softwood with sulfuric acid impregnation in the production of ethanol, based on enzymatic hydrolysis, has been investigated. The parameters investigated were: H2SO4 concentration (0.5 – 4.4% w/w liquid), temperature (180 – 240°C), and residence time (1-20 minutes). The combined severity (log Ro-pH) was used to combine the parameters into a single reaction ordinate. The highest yields of fermentable sugars, i.e., glucose and mannose, were obtained at a combined severity of 3. At this severity, however, the fermentability declined and the ethanol yield decreased. In a comparison with previous results, SO2 impregnation was found to be preferable, since it resulted in approximately the same sugar yields, but better fermentability.

Index Entries

Softwood H2SO4 SO2 steam pretreatment ethanol production 

Copyright information

© Humana Press Inc. 1998

Authors and Affiliations

  • Charlotte Tengborg
    • 1
  • Kerstin Stenberg
    • 1
  • Mats Galbe
    • 1
  • Guido Zacchi
    • 1
  • Simona Larsson
    • 2
  • Eva Palmqvist
    • 2
  • Bärbel Hahn-Hägerdal
    • 2
  1. 1.Deportment of Chemical EngineeringLund UniversityLundSweden
  2. 2.Department of Applied MicrobiologyLund UniversityLundSweden

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