Recent process improvements for the ammonia fiber expansion (AFEX) process and resulting reductions in minimum ethanol selling price

Elizabeth (Newton) Sendich, Mark Laser, Seungdo Kim, Hasan Alizadeh, Lizbeth Laureano-Perez, Bruce Dale, Lee Lynd

Research output: Contribution to journalArticle

  • 99 Citations

Abstract

The ammonia fiber expansion (AFEX) process has been shown to be an effective pretreatment for lignocellulosic biomass. Technological advances in AFEX have been made since previous cost estimates were developed for this process. Recent research has enabled lower overall ammonia requirements, reduced ammonia concentrations, and reduced enzyme loadings while still maintaining high conversions of glucan and xylan to monomeric sugars. A new ammonia recovery approach has also been developed. Capital and operating costs for the AFEX process, as part of an overall biorefining system producing fuel ethanol from biomass have been developed based on these new research results. These new cost estimates are presented and compared to previous estimates. Two biological processing options within the overall biorefinery are also compared, namely consolidated bioprocessing (CBP) and enzymatic hydrolysis followed by fermentation. Using updated parameters and ammonia recovery configurations, the cost of ethanol production utilizing AFEX is calculated. These calculations indicate that the minimum ethanol selling price (MESP) has been reduced from $1.41/gal to $0.81/gal.

LanguageEnglish (US)
Pages8429-8435
Number of pages7
JournalBioresource Technology
Volume99
Issue number17
DOIs
StatePublished - Nov 2008

Profile

Ammonia
ethanol
Sales
Ethanol
ammonia
Fibers
biorefining
Costs and Cost Analysis
cost
Biomass
bioprocessing
ethanol fuels
Ethanol fuels
Costs
Xylans
Recovery
operating costs
Fuel systems
Enzymatic hydrolysis
Glucans

Keywords

  • AFEX pretreatment
  • Biological processing
  • Biomass
  • Ethanol
  • Modeling

ASJC Scopus subject areas

  • Agronomy and Crop Science
  • Food Science
  • Process Chemistry and Technology
  • Applied Microbiology and Biotechnology
  • Bioengineering
  • Environmental Engineering
  • Waste Management and Disposal

Cite this

Recent process improvements for the ammonia fiber expansion (AFEX) process and resulting reductions in minimum ethanol selling price. / Sendich, Elizabeth (Newton); Laser, Mark; Kim, Seungdo; Alizadeh, Hasan; Laureano-Perez, Lizbeth; Dale, Bruce; Lynd, Lee.

In: Bioresource Technology, Vol. 99, No. 17, 11.2008, p. 8429-8435.

Research output: Contribution to journalArticle

Sendich, Elizabeth (Newton) ; Laser, Mark ; Kim, Seungdo ; Alizadeh, Hasan ; Laureano-Perez, Lizbeth ; Dale, Bruce ; Lynd, Lee. / Recent process improvements for the ammonia fiber expansion (AFEX) process and resulting reductions in minimum ethanol selling price. In: Bioresource Technology. 2008 ; Vol. 99, No. 17. pp. 8429-8435
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