Corrosion of metals is one of the most challenging problems in the industry. Corrosion inhibitors are applied in order to reduce this phenomenon; imidazoline type stands out among others, because of its efficiency. Imidazolines are synthesized from fatty acids such as palmitic or oleic, which are found in palm oil and its derivatives. For this reason, the derivatives of the Ecuadorian palm promise to be an alternative for synthesizing imidazoline corrosion inhibitors. Despite this, previous researches have only managed to obtain amidoamine, which has lower efficiencies than imidazoline inhibitors. Bearing this in mind, this research synthesized imidazoline inhibitors from Ecuadorian palm derivatives (crude palm oil, crude palm kernel oil, and fatty acids byproducts), diethylenetriamine (DETA) and aminoethylethanolamine (AEEA) in the molar ratio 2.5:1 amine/oil. The inhibitors were characterized by FTIR and then their performances as a corrosion inhibitor were tested for carbon steel API 5LX52 in saline medium saturated with CO<sub>2</sub> by means of electrochemical techniques, open circuit potential (OCP), linear polarization resistance (LPR) and potentiodynamic polarization curves. The FTIR analysis showed that the molecules synthesized have bands at 1 643, 1 613 and 1 547, which are assigned to the bonds C=N, N=C-N and C-N-C, respectively, demonstrating the presence of the imidazoline molecule. These bonds allow the inhibitors to self-assemble on the surface of the metal forming a protective layer. The corrosion inhibitors synthesized were evaluated at 100 ppm and submitted efficiencies between 70% and 80%. These results demonstrate that the corrosion inhibitor synthesized from Ecuadorian palm derivatives may be an alternative to currently commercially available inhibitors, not only for its efficiency but also for its lower cost.

Synthesis and characterization of imidazoline corrosion inhibitors obtained from Ecuadorian palm oil derivatives (<i>Elaeis guineensis</i>)

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

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Synthesis and characterization of imidazoline corrosion inhibitors obtained from Ecuadorian palm oil derivatives (Elaeis guineensis)