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

C Tengborg, K Stenberg, Mats Galbe, Guido Zacchi, S Larsson, E Palmqvist, Bärbel Hahn-Hägerdal

Research output: Contribution to journalArticlepeer-review

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 degrees 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.
Original languageEnglish
Pages (from-to)3-15
JournalApplied Biochemistry and Biotechnology
Volume70-2
DOIs
Publication statusPublished - 1998

Subject classification (UKÄ)

  • Biochemistry and Molecular Biology

Keywords

  • softwood
  • SO2
  • H2SO4
  • steam pretreatment
  • ethanol production

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