The hydrotrope sodium butyl monoglycol sulfate for the separation of mixtures of o-, m-, and p-chloronitrobenzenes was explored at the eutectic compositions. Three ternary diagrams were constructed using the single- and two-component equilibrium compositions of binary mixtures at different hydrotrope concentrations together with eutectic and two-component saturation tie lines. It was possible to separate two of the three binary simple and the ternary eutectics because sodium butyl monoglycol sulfate was able to shift their equilibrium curves away from the eutectic tie lines.