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

    Research output: Contribution to journalArticle

    • 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.

    Original languageEnglish (US)
    Pages (from-to)3873-3877
    Number of pages5
    JournalIndustrial and Engineering Chemistry Research
    Volume38
    Issue number10
    StatePublished - 1999

    Profile

    ammonia
    Ammonia
    Lactic Acid
    acid
    Lactic acid
    ammonium
    catalyst
    Catalysts
    Afferent Loop Syndrome
    fermentation
    condensation
    glucose
    silica
    Fermentation
    Glucose
    Condensation
    Silica
    Removal
    Silicon Dioxide
    Dye Dilution Technique

    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: Contribution to journalArticle

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

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

    Research output: Contribution to journalArticle

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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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