Abstract <p>A method for chemical recycling of polyethylene terephthalate into a porous carbon material is considered which involves alkaline hydrolysis of polyethylene terephthalate preliminarily dissolved in dimethyl sulfoxide to obtain potassium terephthalate, followed by its pyrolysis at 850°C. Reuse of dimethyl sulfoxide for dissolution of subsequent batches of bottle plastic waste is studied for the first time. The proposed method consists in evaporating water from a mixture of dimethyl sulfoxide and products of alkaline hydrolysis of polyethylene terephthalate. It is shown that, despite the change in the coloration of the solvent, its reuse does not affect the process of alkaline hydrolysis of bottle plastic and it results in the formation of potassium terephthalate, pyrolysis of which forms a porous carbon material with similar morphological and structural characteristics. It is found that all the carbon materials obtained are characterized by a defective graphite-like structure with a specific surface area of 1407–1595 m²/g and the presence of surface oxygen-containing groups.</p>