Premium
Dissolution of Soap Scum by Surfactants. Part III. Effect of Chelant Type on Equilibrium Solubility and Dissolution Rate of Calcium and Magnesium Soap Scums in Various Surfactant Systems
Author(s) -
Itsadat Sawwalak,
Theptat Prariyada,
Scamehorn John F.,
Soontravanich Sukhwan,
Sabatini David A.,
Chavadej Sumaeth
Publication year - 2015
Publication title -
journal of surfactants and detergents
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.349
H-Index - 48
eISSN - 1558-9293
pISSN - 1097-3958
DOI - 10.1007/s11743-015-1731-5
Subject(s) - chemistry , dissolution , solubility , pulmonary surfactant , ethylenediamine , inorganic chemistry , magnesium , nuclear chemistry , organic chemistry , biochemistry
Soap scum can be effectively removed by using an appropriate surfactant with a chelating agent at a high solution pH. The equilibrium solubilities and dissolution rates of two model soap scums [calcium stearate and magnesium stearate: Ca(C 18 ) 2 and Mg(C 18 ) 2 ] were investigated in aqueous solutions containing three different types of surfactants [methyl ester sulfonate (MES) as an anionic surfactant; alcohol ethoxylate (EO9) as a nonionic surfactant; and dimethyldodecylamine oxide (DDAO) as an amphoteric surfactant] in the presence of different biodegradable chelants: trisodium ethylenediamine disuccinic acid (Na 3 EDDS) and tetrasodium glutamate diacetic acid (Na 4 GLDA) compared with disodium ethylenediamine tetraacetate (Na 2 EDTA), a chelant with poor biodegradability. The highest equilibrium solubility and dissolution rate of either soap scum were observed at high pH in the DDAO system with Na 4 GLDA. In addition, the calcium soap scum had a similar to higher equilibrium solubility and a higher dissolution rate constant as compared with the magnesium soap scum.