Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Monitoring of the Content of Imidazoline-Containing Corrosion Inhibitor

  • Zadorozhny, P.A. (Institute of Chemistry, Far Eastern Branch, Russian Academy of Science) ;
  • Sukhoverkhov, S.V. (Institute of Chemistry, Far Eastern Branch, Russian Academy of Science) ;
  • Markin, A.N. (Institute of Chemistry, Far Eastern Branch, Russian Academy of Science) ;
  • Savin, K.I. (Sakhalin Energy Investment Company) ;
  • Prokuda, N.A. (Institute of Chemistry, Far Eastern Branch, Russian Academy of Science)
  • Received : 2016.12.02
  • Accepted : 2017.08.03
  • Published : 2017.08.31
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Abstract

The qualitative composition of active components of the corrosion inhibitor CGW-85567 was studied. It was found that С18:2 and С18:1 imidazolines and the corresponding imidazolin-amides are the major components. The HPLC/MS technique was developed for their determination in the water solutions of monoethylene glycol (MEG). Industrial application of the inhibitor showed that MEG solution retained high concentration of the inhibitor for a long time after ceasing its addition into pipelines. Low values of the partition coefficients (0.010-0.014) of imidazolines in the system "water solution of MEG (concentration of MEG 62-85% v/v) - gas condensate" have allowed to pass on from the technology of continuous pumping of the inhibitor into protected pipelines to the periodic dosing technology. Taking into account a long time of circulation in the system and high temperatures during MEG regeneration process possible degradation products of the inhibitor were studied. N, N-dimethyl-dodecanamine-1, and N, N-dimethyl-tetradecanamine-1 were identified as major degradation products of the corrosion inhibitor CGW-85567.

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References

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