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    FTIR lubricant analysis: Concentration of dispersed sulphuric acid

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    Publication date
    2014
    Author
    Sautermeister, F.A.
    Priest, Martin
    Fox, M.F.
    Keyword
    Ftir
    ; Emulsion
    ; Lubricant degradation
    ; Marine diesel engine
    ; Sulphuric acid
    ; Acid dissociation
    ; Infrared-spectroscopy
    ; Water structure
    ; Solutes
    Peer-Reviewed
    Yes
    
    Metadata
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    Abstract
    This paper aims to establish the acid concentration of finely dispersed droplets in hydrocarbon oils. Small quantities of aqueous sulphuric acid (H2SO4) were found to be trapped within hydrocarbon shells, making them inaccessible for concentration evaluation by titration. Fourier transform infrared spectroscopy (FTIR) used in the attenuated total reflection mode (ATR; FTIR-ATR) was applied to study the reaction products of squalane, C30H62, and an API Group I base oil with various concentrations of aqueous H2SO4. The absorbance comparison usually used for estimating acid concentrations was found to fail when small quantities of acid are trapped in the reaction product. It was found that the peak shift and changes in absorbance found for various pure aqueous acid concentrations were useful to establish the remaining concentration of the trapped H2SO4. This paper fulfils the identified need to study acid dissociation-dependent peak shifts of H2SO4 to find the acid concentration of finely dispersed droplets in hydrocarbon oils.
    URI
    http://hdl.handle.net/10454/10782
    Version
    No full-text in the repository
    Citation
    Sautermeister FA, Priest M and Fox MF (2014) FTIR lubricant analysis: Concentration of dispersed sulphuric acid. Industrial Lubrication and Tribology. 66(4): 555-559.
    Link to publisher’s version
    https://doi.org/10.1108/ilt-07-2012-0065
    Type
    Article
    Collections
    Engineering and Informatics Publications

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