Imidazoline-lauric derivative synthesis using MAOS (microwave assisted organic synthesis) method and its activity as corrosion inhibitor towards carbon steel

Abstract

Imidazoline is a heterocyclic compound containing nitrogen atom, which is wellknown in industry, especially in petroleum field as a corrosion inhibitor of oil refineries in sea environment. In searching of potential organic compounds for corrosion inhibitor, imidazoline-lauric derivative had been successfully synthesized by reacting triethylenetetramine (TETA) and lauric acid (LA) with solvent free and variation of reaction time using MAOS (Microwave Assisted Organic Synthesis) method. The optimum yield of TETA-LA imidazoline was 72.6 % at 7 min reaction time in 800 watts. TETA-LA imidazoline was identified using TLC and melting point analyzer while its structure had been confirmed using Fourier Transform Infrared (FTIR), UV-Vis, Proton Nuclear Magnetic Resonance (1H-NMR), and Mass Spectrometry (MS) spectral data. The highest percentage of inhibition efficiency (% IE) using Tafel polarization method was 74.5 % at 500 ppm of TETA-LA imidazoline. It can be concluded that imidazoline-lauric derivative is potent to be developed as corrosion inhibitor towards carbon steel.