Chitosan-based hyperbranched polyamidoamine for demulsification of oil-in-water wastewater, and quaternary ammonium salt thereof

The invention discloses a chitosan-based hyperbranched polyamidoamine for demulsification of oil-in-water wastewater. Chitosan is dispersed in a solvent, an aldehyde compound is added, uniform mixing is performed, an acrylate compound is added, a catalyst is added, a reaction is performed under the illumination condition, and suction filtration is performed after the reaction is completed to obtain an ester-terminated chitosan intermediate; and the ester-terminated chitosan intermediate is dispersed in a solvent, polybasic aliphatic amine and the acrylate compound are added, and transesterification is performed at room temperature to obtain the chitosan-based hyperbranched polyamidoamine. The invention also discloses a low-temperature high-efficiency chitosan-based hyperbranched amide amine demulsifier modified with quaternary ammonium salt, obtained by carrying out quaternary ammonium salt modification on the chitosan-based hyperbranched polyamide amine. The chitosan-based hyperbranched polyamidoamine takes