Kinetics of the aqueous-phase hydrogenation of L-alanine to L-alaninol

    Research output: Research - peer-reviewArticle

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    Abstract

    The kinetics of the aqueous-phase, stereoretentive hydrogenation of alanine to alaninol over 5 wt % Ru/C catalyst in a three-phase stirred batch reactor is presented. Alanine readily undergoes hydrogenation when in the carboxylic acid form (-COOH), a condition that can be achieved by acidifying the reaction solution with phosphoric acid. The conversion rate is not limited by mass-transport resistances over the ranges of temperature (353-398 K), hydrogen pressure (1.7-13.8 MPa), alanine feed concentration (0.22-0.46 M), and phosphoric acid concentration (0-1.2M) investigated. A Langmuir-Hinshelwood (L-H) kinetic model is presented in which protonated alanine and undissociated phosphoric acid compete for one set of surface sites and H2 dissociatively adsorbs on a second type of site. The average error between the experimental and predicted conversions over all data collected was 8%.

    LanguageEnglish (US)
    Pages3297-3303
    Number of pages7
    JournalIndustrial and Engineering Chemistry Research
    Volume43
    Issue number13
    StatePublished - Jun 23 2004

    Profile

    Alanine
    Hydrogenation
    Kinetics
    2-aminopropanol
    Phosphoric acid
    kinetics
    acid
    phosphoric acid
    Batch reactors
    Carboxylic acids
    Mass transfer
    Hydrogen
    Catalysts
    Temperature
    carboxylic acid
    mass transport
    catalyst
    hydrogen
    temperature
    reactor

    ASJC Scopus subject areas

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

    Cite this

    Kinetics of the aqueous-phase hydrogenation of L-alanine to L-alaninol. / Jere, Frank T.; Jackson, James E.; Miller, Dennis J.

    In: Industrial and Engineering Chemistry Research, Vol. 43, No. 13, 23.06.2004, p. 3297-3303.

    Research output: Research - peer-reviewArticle

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    abstract = "The kinetics of the aqueous-phase, stereoretentive hydrogenation of alanine to alaninol over 5 wt % Ru/C catalyst in a three-phase stirred batch reactor is presented. Alanine readily undergoes hydrogenation when in the carboxylic acid form (-COOH), a condition that can be achieved by acidifying the reaction solution with phosphoric acid. The conversion rate is not limited by mass-transport resistances over the ranges of temperature (353-398 K), hydrogen pressure (1.7-13.8 MPa), alanine feed concentration (0.22-0.46 M), and phosphoric acid concentration (0-1.2M) investigated. A Langmuir-Hinshelwood (L-H) kinetic model is presented in which protonated alanine and undissociated phosphoric acid compete for one set of surface sites and H2 dissociatively adsorbs on a second type of site. The average error between the experimental and predicted conversions over all data collected was 8%.",
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    N2 - The kinetics of the aqueous-phase, stereoretentive hydrogenation of alanine to alaninol over 5 wt % Ru/C catalyst in a three-phase stirred batch reactor is presented. Alanine readily undergoes hydrogenation when in the carboxylic acid form (-COOH), a condition that can be achieved by acidifying the reaction solution with phosphoric acid. The conversion rate is not limited by mass-transport resistances over the ranges of temperature (353-398 K), hydrogen pressure (1.7-13.8 MPa), alanine feed concentration (0.22-0.46 M), and phosphoric acid concentration (0-1.2M) investigated. A Langmuir-Hinshelwood (L-H) kinetic model is presented in which protonated alanine and undissociated phosphoric acid compete for one set of surface sites and H2 dissociatively adsorbs on a second type of site. The average error between the experimental and predicted conversions over all data collected was 8%.

    AB - The kinetics of the aqueous-phase, stereoretentive hydrogenation of alanine to alaninol over 5 wt % Ru/C catalyst in a three-phase stirred batch reactor is presented. Alanine readily undergoes hydrogenation when in the carboxylic acid form (-COOH), a condition that can be achieved by acidifying the reaction solution with phosphoric acid. The conversion rate is not limited by mass-transport resistances over the ranges of temperature (353-398 K), hydrogen pressure (1.7-13.8 MPa), alanine feed concentration (0.22-0.46 M), and phosphoric acid concentration (0-1.2M) investigated. A Langmuir-Hinshelwood (L-H) kinetic model is presented in which protonated alanine and undissociated phosphoric acid compete for one set of surface sites and H2 dissociatively adsorbs on a second type of site. The average error between the experimental and predicted conversions over all data collected was 8%.

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