In the paper,a quaternary copolymer corrosion and scale inhibitor was synthesized by using acrylic acid(AA),sodium maleic acid(MAH-Na),vinylpyrrolidone(NVP),and self synthesized quaternary ammonium imidazoline(QIM)as monomers.The system was initiated by UV light with diisobutyrate hydrochloride(V50).The optimal monomer ratio was selected through orthogonal experiments as 18∶6∶3.5∶2.5.Combined with static scaling experiments,dynamic corrosion experiments,and molecular weight tests,the optimal synthesis conditions were obtained as follows:V50 dosage of 0.6wt%,reaction time of 8h,monomer concentration of 35wt%.The corrosion inhibition rate of the corrosion and scale inhibitor synthesized under the optimal conditions reached 86.1%,CaCO3 scale inhibition rate reached 91.2%,CaSO4 scale inhibition rate reached 96.1%,and BaSO4 scale inhibition rate reached 73.2%.The performance was evaluated using on-site produced water as an example due to the single corrosion and scale inhibitors purchased in the market.
quad copolymerizationmonomer ratioorthogonal experimentcorrosion and scale inhibitors
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