Theoretical and experimental study of the absorption rate of H2S in CuSO4 solutions: the effect of enhancement of mass transfer by a precipitation reaction

H. ter Maat, M. Al-Tarazi, J.A. Hogendoorn, J.P.M. Niederer, G.F. Versteeg

    Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

    Abstract

    In this paper the desulphurization of gas streams using aqueous copper sulphate (CuSO4) solutions as washing liquor is studied theoretically and experimentally. The desulphurization is accomplished by a precipitation reaction that occurs when sulphide ions and metal ions are brought into contact with each other.

    Absorption experiments of H2S in aqueous CuSO4 solutions were carried out in a Mechanically Agitated Gas Liquid Reactor. The experiments were conducted at a temperature of 293 K and CuSO4 concentrations between 0.01 and 0.1 M. These experiments showed that the process efficiently removes H2S. Furthermore, the experiments indicate that the absorption of H2S in a CuSO4 solution may typically be considered a mass transfer limited process at, for this type of industrial process, relevant conditions.

    The extended model developed by Al-Tarazi et al. (2004) has been used to predict the rate of H2S absorption. This model describes the absorption and accompanying precipitation process in terms of, among others, elementary reaction steps, particle nucleation and growth. The results from this extended model and results obtained with a much simpler model, regarding the absorption of H2S in CuSO4 containing aqueous solutions as absorption of a gas accompanied by an instantaneous irreversible reaction were compared with experimental results. From this comparison it appeared that the absorption rate of H2S in a CuSO4 solution can, under certain conditions, be considered as a mass transfer rate controlled process. Under a much wider range of conditions the error that is made by assuming that the absorption process is a mass transfer controlled process, is still within engineering accuracy. Application of the simple model allows for a considerable reduction of the theoretical effort needed for the design of a gas–liquid contacting device, thereby still assuring that the desired gas specification can be met under a wide range of operating conditions.

    A comparison of the experimental results and the simulated results showed that the extended model gives an under prediction of the H2S absorption rate for the experimental conditions applied.
    Original languageEnglish
    Title of host publicationIChemE Distillation & Absorption Conference 2006
    EditorsEva Sørensen
    PublisherInstitution of Chemical Engineers
    Pages481-497
    ISBN (Print)9780852955055
    Publication statusPublished - 2006
    EventIChemE Distillation and Absorption Conference 2006 - Rugby, United Kingdom
    Duration: 4 Sep 20066 Sep 2006

    Publication series

    NameSymposium series
    PublisherInstitution of Chemical Engineers
    Volume152
    ISSN (Print)0307-0492

    Conference

    ConferenceIChemE Distillation and Absorption Conference 2006
    CountryUnited Kingdom
    CityRugby
    Period4/09/066/09/06

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  • Cite this

    ter Maat, H., Al-Tarazi, M., Hogendoorn, J. A., Niederer, J. P. M., & Versteeg, G. F. (2006). Theoretical and experimental study of the absorption rate of H2S in CuSO4 solutions: the effect of enhancement of mass transfer by a precipitation reaction. In E. Sørensen (Ed.), IChemE Distillation & Absorption Conference 2006 (pp. 481-497). (Symposium series; Vol. 152). Institution of Chemical Engineers.