Dissolution of Soap Scum by Surfactant Part I: Effects of Chelant and Type of Soap Scum. Issue 5 (5th November 2013)

• Record Type: Journal Article
• Authors: Itsadanont, Sawwalak; Scamehorn, John F.; Soontravanich, Sukhwan; Sabatini, David A.; Chavadej, Sumaeth
• Is Part Of: Journal of surfactants and detergents. Volume 17:Issue 5(2014)
• Page Start: 849
• Page End: 857
• Publication Date: 2013-11-05
• Subjects: Anionic surfactants -- Application of surfactants -- Non‐ionic surfactants -- Soap scum; Surface active agents -- Periodicals; Detergents -- Periodicals; 668.1
• DOI: 10.1007/s11743-013-1544-3
• Languages: English
• ISSNs: 1097-3958

Abstract

Abstract: The equilibrium solubilities of two model soap scums [calcium stearate and magnesium stearate: Ca(C18 )2 and Mg(C18 )2 ] were measured in aqueous solutions containing three different types of surfactants: methyl ester sulfonate (MES) as an anionic; alcohol ethoxylate (EO9) as a nonionic; and dimethyldodecylamine oxide (DDAO) as an amphoteric with and without a chelating agent [disodium ethylenediaminetetraacetate (Na2 EDTA)]. The solubility of calcium soap scum was generally higher than that of magnesium soap scum, the exception being some DDAO systems. The use of the DDAO surfactant with the Na2 EDTA chelating agent at high pH gives the highest solubilities of both studied soap scums. The soap scum solubility is on the order of 2, 000 times that in water at high pH. The DDAO is the most effective surfactant under all conditions. The MES is more effective than the EO9 at low pH with the opposite trend observed at high pH. The synergism from added chelant is generally greater at higher pH and is greatest for DDAO followed by EO9.