Thermally safe operation of a semibatch reactor for liquid-liquid reactions - Fast reactions

M. Steensma, Metske Steensma, K.R. Westerterp

    Research output: Contribution to journalArticleAcademicpeer-review

    64 Citations (Scopus)
    54 Downloads (Pure)

    Abstract

    Accumulation of the reactant supplied to a cooled semibatch reactor (SBR) will occur if the mass transfer rate across the interface is insufficient to keep pace with the supply rate. Then, due to a low starting temperature or supercooling, the reaction temperature does not rise fast enough to the desired value. This accumulation may eventually lead to a temperature runaway. We investigated the possibility of such an event for reactions of the type "chemically enhanced mass transfer" or "fast" and found that only low distribution coefficients, i.e. 10-4 or lower, can lead to accumulation. At higher distribution coefficients, the mass transfer rate across the interface of a well-mixed dispersion is generally sufficient to prevent accumulation. A thermal runaway in the fast regime exerts a moderate effect, because the effective activation energy is halved. Calculations for the instantaneous reaction regime, regarded as a special case of fast reactions, show that there is no runaway possible.
    Original languageUndefined
    Pages (from-to)367-375
    Number of pages9
    JournalChemical engineering and technology
    Volume14
    Issue number6
    DOIs
    Publication statusPublished - 1991

    Keywords

    • METIS-105799
    • IR-70946

    Cite this

    Steensma, M. ; Steensma, Metske ; Westerterp, K.R. / Thermally safe operation of a semibatch reactor for liquid-liquid reactions - Fast reactions. In: Chemical engineering and technology. 1991 ; Vol. 14, No. 6. pp. 367-375.
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    abstract = "Accumulation of the reactant supplied to a cooled semibatch reactor (SBR) will occur if the mass transfer rate across the interface is insufficient to keep pace with the supply rate. Then, due to a low starting temperature or supercooling, the reaction temperature does not rise fast enough to the desired value. This accumulation may eventually lead to a temperature runaway. We investigated the possibility of such an event for reactions of the type {"}chemically enhanced mass transfer{"} or {"}fast{"} and found that only low distribution coefficients, i.e. 10-4 or lower, can lead to accumulation. At higher distribution coefficients, the mass transfer rate across the interface of a well-mixed dispersion is generally sufficient to prevent accumulation. A thermal runaway in the fast regime exerts a moderate effect, because the effective activation energy is halved. Calculations for the instantaneous reaction regime, regarded as a special case of fast reactions, show that there is no runaway possible.",
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    Thermally safe operation of a semibatch reactor for liquid-liquid reactions - Fast reactions. / Steensma, M.; Steensma, Metske; Westerterp, K.R.

    In: Chemical engineering and technology, Vol. 14, No. 6, 1991, p. 367-375.

    Research output: Contribution to journalArticleAcademicpeer-review

    TY - JOUR

    T1 - Thermally safe operation of a semibatch reactor for liquid-liquid reactions - Fast reactions

    AU - Steensma, M.

    AU - Steensma, Metske

    AU - Westerterp, K.R.

    PY - 1991

    Y1 - 1991

    N2 - Accumulation of the reactant supplied to a cooled semibatch reactor (SBR) will occur if the mass transfer rate across the interface is insufficient to keep pace with the supply rate. Then, due to a low starting temperature or supercooling, the reaction temperature does not rise fast enough to the desired value. This accumulation may eventually lead to a temperature runaway. We investigated the possibility of such an event for reactions of the type "chemically enhanced mass transfer" or "fast" and found that only low distribution coefficients, i.e. 10-4 or lower, can lead to accumulation. At higher distribution coefficients, the mass transfer rate across the interface of a well-mixed dispersion is generally sufficient to prevent accumulation. A thermal runaway in the fast regime exerts a moderate effect, because the effective activation energy is halved. Calculations for the instantaneous reaction regime, regarded as a special case of fast reactions, show that there is no runaway possible.

    AB - Accumulation of the reactant supplied to a cooled semibatch reactor (SBR) will occur if the mass transfer rate across the interface is insufficient to keep pace with the supply rate. Then, due to a low starting temperature or supercooling, the reaction temperature does not rise fast enough to the desired value. This accumulation may eventually lead to a temperature runaway. We investigated the possibility of such an event for reactions of the type "chemically enhanced mass transfer" or "fast" and found that only low distribution coefficients, i.e. 10-4 or lower, can lead to accumulation. At higher distribution coefficients, the mass transfer rate across the interface of a well-mixed dispersion is generally sufficient to prevent accumulation. A thermal runaway in the fast regime exerts a moderate effect, because the effective activation energy is halved. Calculations for the instantaneous reaction regime, regarded as a special case of fast reactions, show that there is no runaway possible.

    KW - METIS-105799

    KW - IR-70946

    U2 - 10.1002/ceat.270140602

    DO - 10.1002/ceat.270140602

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    EP - 375

    JO - Chemical engineering and technology

    JF - Chemical engineering and technology

    SN - 0930-7516

    IS - 6

    ER -