Sorption behaviour of dodecylsulphate and other anionic surfactants on anion-exchange resins

Abstract

Concentration isotherms have been determined for sodium dodecylsulphate from aqueous solution on the chloride form of Amberlyst A27, Cellex-T, Amberlyst IRA68, Zerolit FF(IP), Dowex 1-X8, Amberlite IRA401, Amberlite IRA904, Zerolit MPH, Amberlite IRA47S and Amberlyst IRA93 and on bromide and tetrafluorobromate forms of Amberlyst A27. Isotherms have also been determined on Amberlyst A27 (chloride) for increased ionic strength in the presence of sodium chloride adjuster at 20 and 50 times the resin capacity and for various organic-aqueous media, including 50% and 75% ethanol-water, dimethylformamide-water and tetrahydrofuran-water.

Amberlyst A27 (chloride) was selected for concentration isotherm studies of dodecyl- and tetradecylsulphate from water and 75% ethanol-water, decyl-, tetradecyl- and pentadecylbenzenesulphonate from water and 75% ethanol-water, and sec-dodecylsulphate, dodecane- and dodecenesulphonate, dodecanoate, 4-toluenesulphonate, tripolyphosphate and sulphate from water.

Column experiments designed to desorb and separate various anions with Amberlyst A27 are described and separations of anion pairs such as dodecanoate and dodecylsulphate, and tripolyphosphate and decylbenzenesulphonate, are discussed.