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Dissolution of Soap Scum by Surfactant. Part II: Effects of NaCl and Added Chelant on Equilibrium Solubility and Dissolution Rate of Calcium Soap Scum in Amphoteric Surfactant Solutions

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Journal of Surfactants and Detergents

Abstract

The effects of solution pH and NaCl on the equilibrium solubility and dissolution rate of a model soap scum (calcium octadecanoate or calcium stearate) in aqueous solutions of dimethyldodecylamine oxide surfactant (DDAO) with and without chelant disodium ethylenediaminetetraacetate are reported. The equilibrium solubility and dissolution rate of soap scum increased with increasing solution pH when the chelant was added in the DDAO system while in the chelant-free systems the opposite trend was observed. The added NaCl has an ambiguous effect on the solubility and dissolution rate of soap scum in the absence of chelant, but a small level of added NaCl reduces both solubility and the dissolution rate constant in the presence of chelant. Both equilibrium and kinetics of dissolution are maximized at high pH with DDAO/chelant and no added salt.

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Acknowledgments

Financial support for this work was provided by The Thailand Research Fund (TRF)—The Royal Golden Jubilee Ph.D. Program (RGJ); Center of Excellence on Petrochemical and Materials Technology, Thailand; The Petroleum and Petrochemical College, Chulalongkorn University; The industrial sponsors of the Institute for Applied Surfactant Research at the University of Oklahoma including CESI Chemical Research, Church and Dwight, Clorox, ConocoPhillips, Ecolab, GSK (GlaxoSmithKline), Halliburton Services, Huntsman, InVia-Westvaco, Novus, Procter and Gamble, Phillips 66, Sasol North America, S.C. Johnson and Son, and Shell Chemical. We thank David Scheuing for introducing us to this research topic.

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Authors and Affiliations

  1. The Petroleum and Petrochemical College, Chulalongkorn University, Bangkok, Thailand

    Sawwalak Itsadanont, Darunrat Ratanalert & Sumaeth Chavadej

  2. Institute for Applied Surfactant Research, University of Oklahoma, Norman, Oklahoma

    Sukhwan Soontravanich, John F. Scamehorn & David A. Sabatini

  3. Center of Excellence on Petrochemical and Materials Technology, Chulalongkorn University, 254 Soi Chulalongkorn12, Phayathai Rd., Wangmai, Patumwan, Bangkok, 10330, Thailand

    Sumaeth Chavadej

Authors
  1. Sawwalak Itsadanont
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  2. Darunrat Ratanalert
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  3. Sukhwan Soontravanich
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  4. John F. Scamehorn
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  5. David A. Sabatini
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  6. Sumaeth Chavadej
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Correspondence to Sumaeth Chavadej.

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Itsadanont, S., Ratanalert, D., Soontravanich, S. et al. Dissolution of Soap Scum by Surfactant. Part II: Effects of NaCl and Added Chelant on Equilibrium Solubility and Dissolution Rate of Calcium Soap Scum in Amphoteric Surfactant Solutions. J Surfact Deterg 17, 859–864 (2014). https://doi.org/10.1007/s11743-014-1583-4

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  • DOI: https://doi.org/10.1007/s11743-014-1583-4

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