The extent to which hexadecyltrimethylammonium chloride is removed from 10−5Msolutions by solvent sublation into 2-octanol is compared to the extraction achieved by equilibrium distribution between the two phases. A comparison is also made between.the rates of removal by solvent sublation and by foaming, which shows the former process to be slower but to be preferable if the foams are unstable. The findings are in keeping with a mechanism of solvent sublation published previously.