Abstract
Poly(ethylene terephthalate), PET, waste was depolymerized with propylene glycol (PG) to an oligoester (OE). The hydroxyl value of the glycolized product before and after removing the free glycol were determined. The glycolized product was reacted with polyethylene glycol (PEG) of different molecular weights, namely, 600, 1000 and 4000 to form compounds having different hydrophil-lipophil balance (HLB) and hence different surface activities. The interfacial tension at the aqueous/benzene interface was determined. It was found that the demulsifiers' concentrations required to cause minimum interfacial tension are always less than that inducing maximum demulsification efficiency. The demulsification efficiency of the prepared surfactants in breaking synthetic water-in-benzene emulsions stabilized by petroleum asphaltenes was evaluated. The data revealed that the demulsification efficiency increases with increasing the demulsifiers' concentration, contact time and hydrophilicity.
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