The graft copolymerization of acrylic acid (AA) initiated by potassium persulfate (PPS) progresses through free radical initiation mechanism carried out onto purified guar gum backbone and acrylamide (AM) which has been synthesized by grafting polyacrylamide chains onto carboxymethyl guar gum (CMG) backbone using conventional redox grafting. The graft copolymers were characterized using FT-IR spectroscopy, elemental analysis, thermal analysis, scanning electron microscopy and rheologically. Reverse demulsification performance of the graft copolymers were evaluated using (crude oil-in-water emulsion) sample by a modified jar test method. It showed that graft copolymers based on acrylamide were better reverse demulsifiers than those based on acrylic acid. Among acrylamide synthetic graft copolymers CMG-g-AM (CGA1) diluted to about 1% in a dose of 50ppm performed best when compared with the other synthetic graft copolymers of acrylamide with a reverse demulsification efficiency of 64.7%, while the best reverse demulsification efficiency for graft copolymers of acrylic acid GG-g-AA (GGA2) diluted to about 1% in a dose of 50ppm is 59.2%, both products didn’t outperformed the Industrial Reverse Demulsifier (IRD).
guar gum, N, N-dimethylacrylamide, acrylic acid, acrylamide, graft copolymerization, oil-in-water emulsion, flocculation
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