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Hyperbranched poly(amido amine) demulsifier (PDDM) was synthesized by a modified “one‐pot” method with 4,4‐diaminodiphenyl methane as the central core and ethylenediamine as the interior branches. The structure of the demulsifier was confirmed by proton nuclear magnetic resonance and Fourier transform infrared. The effects of the temperature and PDDM concentration on the demulsification performance...