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

    • 96 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.

    Original languageEnglish (US)
    Pages (from-to)8429-8435
    Number of pages7
    JournalBioresource Technology
    Volume99
    Issue number17
    DOIs
    StatePublished - Nov 2008

    Profile

    Ammonia
    Ethanol
    ammonia
    Fibers
    Abnormal Erythrocytes
    Saimiriine herpesvirus 2
    Costs and Cost Analysis
    ethanol
    cost
    Costs
    Biomass
    Sales
    Recovery
    Caprylates
    Panthera
    Muscle Contraction
    biorefining
    biomass
    cost estimates
    Xylans

    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, Vol. 99, No. 17, 11.2008, p. 8429-8435.

    Research output: Contribution to journalArticle

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