Reaction and kinetic studies of lactic acid conversion over alkali-metal salts

Man S. Tam, Radu Craciun, Dennis J. Miller, James E. Jackson

    Research output: Research - peer-reviewArticle

    • 32 Citations

    Abstract

    Studies of lactic acid catalytic conversion over alkali salts and bases on silica demonstrate that the yield of 2,3-pentanedione (23P) increases with decreasing Lewis acidity of the alkali metal, from 15% for lithium hydroxide at 320°C to 49% for cesium hydroxide at 280°C. The rate of 23P formation varies linearly with alkali metal loading up to saturation at 2 mmol of catalyst/g of support. Experiments with different silica supports showed that acetaldehyde formation increases with support acidity, reducing 23P yield. Postreaction FTIR studies indicate the presence of alkali lactate as the dominant species on the support surface at reaction conditions. These results, along with the kinetic model developed, support the proposed mechanism of 23P formation as a condensation between lactic acid and alkali lactate.

    LanguageEnglish (US)
    Pages2360-2366
    Number of pages7
    JournalIndustrial and Engineering Chemistry Research
    Volume37
    Issue number6
    StatePublished - 1998

    Profile

    Alkali metals
    Lactic acid
    Acidity
    Silica
    Salts
    Kinetics
    Alkali Metals
    Lactic Acid
    2,3-pentanedione
    alkali metal
    salt
    kinetics
    acid
    Alkalies
    Acetaldehyde
    Cesium
    Catalyst supports
    Condensation
    Lithium
    Catalysts

    ASJC Scopus subject areas

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

    Cite this

    Reaction and kinetic studies of lactic acid conversion over alkali-metal salts. / Tam, Man S.; Craciun, Radu; Miller, Dennis J.; Jackson, James E.

    In: Industrial and Engineering Chemistry Research, Vol. 37, No. 6, 1998, p. 2360-2366.

    Research output: Research - peer-reviewArticle

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