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Abstract
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In this study, an adsorptive polyethersulfone (PES) membrane was used to remove the heat stable salts (HSS) from 40 wt.% methyldiethanolamine (MDEA). The synthesized membranes were characterized using SEM, FTIR, porosity and mean pore size calculations, contact angle measurement, pure water and amine flux tests in order to examine their morphology. It was observed that Langmuir equilibrium isotherm best explained the ion exchange process with the highest capacity reaching 22.63 mg/g. The surface of the optimized M2 membrane was coated with a polyamide (PA) layer via interfacial polymerization (IP) method to examine Donnan effect on salts rejection. The study demonstrated that the membranes' ability to reject ions was influenced by the membrane's surface charge. The highest removal efficiency was reported for phosphate ions, which was 82.2% for M2/IP. Divalent ions like sulfate and oxalate were rejected more effectively than monovalent ions like chloride and nitrate. The results suggest that adsorptive membranes offer a cost effective and efficient alternative for amine recovery benefiting refineries and related industries.
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