An adsorption technique named for these systems can be used to purify the green solvent dimethyl carbonate over alumina followed by PSD. The efficiency of processing these systems can be improved by using extractive dividing wall columns. These systems are visualized on residue curve maps as nodes or saddles. Heterogeneous types of these systems can be generated by batch addition of entrainers like cyclohexane into an immiscible mixture. These systems often show positive or negative deviations from Raoult’s (-5[1])law. (10[1]-5[1])The formation of these systems explains why benzene must be added to a 96-percent ethanol in water mixture for further purification. For 10 points, name these mixtures with identical liquid and vapor compositions that prevent their separation by simple distillation. (10[1])■END■ (10[1]0[2])