Question: Which alkylbenzenesulfonate anionic surfactants are prone to salting out?
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It is an anionic surfactant whose infrared spectrum is very similar to that of sodium dodecylbenzenesulfonate. However, its 0.5% aqueous solution can undergo salting out, whereas sodium dodecylbenzenesulfonate cannot. Question: Which alkylbenzenesulfonate anionic surfactants are prone to salting out?
Could you share your infrared spectrum? I am also currently trying to determine the structure of a sodium alkylbenzenesulfonate; I have its NMR spectrum.
As a supplementary note, in my sample, which was originally a clear methanol solution, pale yellow (white) crystals also precipitated after being left for some time
The infrared instrument I use is very old; it records spectra on paper, and it’s not possible to share those spectra.
The alkylbenzenesulfonate anionic surfactant I isolated is light brownish-red in color after drying; it is hygroscopic, soluble in water, and prone to salting out. It dissolves to a small extent in petroleum ether, chloroform, propane, and ethanol respectively.