This review article considers the properties of the homologous series of ethoxylated monoalkylphenols C9H19C6H4O(C2H4O)nH with degrees of oxyethylation from n = 2 to n = 12, which are effective nonionic surfactants for cloud point extraction. The results of cloud point measurements of aqueous solutions of pure ethoxylated monoalkylphenols, in their mutual mixtures, in the presence of sodium salts, depending on the concentration of the surfactant and the balance of surfactants in binary mixtures are discussed. Based on the results of self-diffusion coefficient measurements, the effective radii of micelles and dehydrated aggregates of surfactants near and above the turbidity region are calculated, and the phenomenon of oxyethylene chain contraction is discussed. The efficiency of phenol CPE was measured by NMR spectroscopy, the effect of electrolytes and the composition of mutual mixtures of surfactants on increasing the efficiency of CPE and reducing the process temperature to room values ​​was analyzed. The CPE method is an effective, environmentally friendly method of wastewater treatment, and the homologous series of ethoxylated monoalkylphenols are excellent nonionic surfactants for it.