Lactic acid conversion to 2,3-pentanedione and acrylic acid over silica-supported sodium nitrate: Reaction optimization and identification of sodium lactate as the active catalyst

Douglas C. Wadley, Man S. Tam, Prashant B. Kokitkar, James E. Jackson, Dennis J. Miller

    Research output: Research - peer-reviewArticle

    • 54 Citations

    Abstract

    Lactic acid is converted to 2,3-pentanedione, acrylic acid, and other products in vapor-phase reactions over silica-supported sodium lactate formed from sodium nitrate. Multiparameter optimization of reaction conditions using a Box-Benkhen experimental design shows that the highest yield and selectivity to 2,3-pentanedione are achieved at low temperature, elevated pressure, and long contact time, while yield and selectivity to acrylic acid are most favorable at high temperature, low pressure, and short contact time. Post-reaction Fourier transform infrared spectroscopic analyses of the catalyst indicate that sodium nitrate as the initial catalyst material is transformed to sodium lactate at the onset of reaction via proton transfer from lactic acid to nitrate. The resultant nitric acid vaporizes as it is formed, leaving sodium lactate as the sole sodium-bearing species on the catalyst during reaction.

    LanguageEnglish (US)
    Pages162-171
    Number of pages10
    JournalJournal of Catalysis
    Volume165
    Issue number2
    StatePublished - 1997

    Profile

    sodium nitrates
    lactates
    lactic acid
    acrylic acid
    sodium
    silicon dioxide
    catalysts
    acids
    optimization
    Sodium Lactate
    Silicon Dioxide
    Lactic Acid
    Catalysts
    2,3-pentanedione
    sodium nitrate
    Lactic acid
    Acrylics
    Nitrates
    Silica
    Sodium

    ASJC Scopus subject areas

    • Catalysis
    • Process Chemistry and Technology

    Cite this

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    abstract = "Lactic acid is converted to 2,3-pentanedione, acrylic acid, and other products in vapor-phase reactions over silica-supported sodium lactate formed from sodium nitrate. Multiparameter optimization of reaction conditions using a Box-Benkhen experimental design shows that the highest yield and selectivity to 2,3-pentanedione are achieved at low temperature, elevated pressure, and long contact time, while yield and selectivity to acrylic acid are most favorable at high temperature, low pressure, and short contact time. Post-reaction Fourier transform infrared spectroscopic analyses of the catalyst indicate that sodium nitrate as the initial catalyst material is transformed to sodium lactate at the onset of reaction via proton transfer from lactic acid to nitrate. The resultant nitric acid vaporizes as it is formed, leaving sodium lactate as the sole sodium-bearing species on the catalyst during reaction.",
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    AU - Kokitkar,Prashant B.

    AU - Jackson,James E.

    AU - Miller,Dennis J.

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