Green synthesis of polymeric surfactants from recycling of plastic waste for applications on steel protection in the petroleum industry

Abstract

Green synthesis of four novel nonionic polymeric surfactants: from the recycled product of poly (ethylene terephthalate) plastic waste for application in corrosion protection of carbon steel. In this respect, PET waste was subjected to aminolysis and glycolysis via a reaction with Trimethylenediamine (TEDA) and Tri ethylene glycol (TEG) in the presence of suitable catalysts. The prepared materials were characterized by FT-IR, 1HNMR, and elemental analysis. It was evaluated as a corrosion inhibitor for steel (type-X60) used in the petroleum industry in the marine environment. Chemical, analytical, and electrochemical techniques were used for the evaluation of the corrosion inhibition efficiency of the prepared polymeric surfactants. The effect of concentration and temperature was studied. The maximum inhibition efficiency (IE) of 96% at an inhibitor concentration of 200 ppm and a temperature of 303 K. The glycoside and amide products were compared, the efficiency of amide products (96%) was higher than the efficiency of glycoside products (91%). According to potentiodynamic polarization data, the prepared surfactant boosts polarization resistance and inhibition performance by adsorbing on the metal/electrolyte interface. The surface morphology of steel was examined using SEM. A protective coating of inhibitor molecules forms on the steel surface.

Keywords

• Green synthesis
• polymeric surfactant
• plastic waste
• corrosion of steel
• AAS
• PDP, EIS, and SEM