Abstract
It has been demonstrated that systems containing a nonionic surfactant and formamide in certain cases display a lower consolute solution temperature, analogously to the corresponding aqueous systems. The solubilization of hydrocarbon in such solutions, containing tetraethylene glycol dodecyl ether as surfactant, has been investigated and is shown to be strongly temperature dependent. Three-phase regions in ternary systems formamide/hydrocarbon/tetraethylene glycol dodecyl ether exist in temperature intervals which, for a given surfactant, vary strongly depending on the hydrocarbon used. The trend for the intervals is similar to the trend for the aqueous systems: the larger the aliphatic hydrocarbon, the higher the temperature where the three-phase region occurs.
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