Effects of ammonium lactate on 2,3-pentanedione formation from lactic acid

    Research output: Research - peer-reviewArticle

    • 14 Citations

    Abstract

    Ammonia is often used for pH adjustment during fermentation of glucose to lactic acid. Its presence as ammonium lactate in the catalytic upgrading of lactic acid to 2,3-pentanedione over CsOH/silica reduces diketone yields to nearly zero at high ammonia levels. Removal of ammonia from the feed restores 2,3-pentanedione yield, indicating that the catalyst itself is not poisoned by ammonia. Instead, 2,3-pentanedione continues to form in the presence of ammonia and is consumed in secondary reactions downstream of the catalyst bed. Both base-catalyzed self-condensation of 2,3-pentanedione to duroquinone (and oligomeric species) and direct reaction of ammonia with the diketone are observed.

    LanguageEnglish (US)
    Pages3873-3877
    Number of pages5
    JournalIndustrial and Engineering Chemistry Research
    Volume38
    Issue number10
    StatePublished - 1999

    Profile

    ammonium
    ammonia
    acid
    effect
    Ammonia
    Lactic Acid
    2,3-pentanedione
    Lactic acid
    catalyst
    Catalysts
    fermentation
    condensation
    glucose
    silica
    removal
    Silicon Dioxide
    Fermentation
    Condensation
    Glucose
    duroquinone

    ASJC Scopus subject areas

    • Chemical Engineering (miscellaneous)
    • Environmental Science(all)
    • Polymers and Plastics

    Cite this

    Effects of ammonium lactate on 2,3-pentanedione formation from lactic acid. / Tam, Man S.; Jackson, James E.; Miller, Dennis J.

    In: Industrial and Engineering Chemistry Research, Vol. 38, No. 10, 1999, p. 3873-3877.

    Research output: Research - peer-reviewArticle

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    abstract = "Ammonia is often used for pH adjustment during fermentation of glucose to lactic acid. Its presence as ammonium lactate in the catalytic upgrading of lactic acid to 2,3-pentanedione over CsOH/silica reduces diketone yields to nearly zero at high ammonia levels. Removal of ammonia from the feed restores 2,3-pentanedione yield, indicating that the catalyst itself is not poisoned by ammonia. Instead, 2,3-pentanedione continues to form in the presence of ammonia and is consumed in secondary reactions downstream of the catalyst bed. Both base-catalyzed self-condensation of 2,3-pentanedione to duroquinone (and oligomeric species) and direct reaction of ammonia with the diketone are observed.",
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