The microwave assisted synthesis of 1-alkyl-3-methylimidazolium bromide as potential corrosion inhibitor toward carbon steel in 1 M HCl solution saturated with carbon dioxide

Abstract

Injection of corrosion inhibitor into the fluid current of oil and gas pipelines is an effective way to mitigate corrosion rate on the inner-surface parts of pipelines, especially carbon steel pipelines. In this research, two alkylimidazolium ionic liquids, 1-decyl-3-methylimidazolium bromide (IL1) and 1-dodecyl-3-methylimidazolium bromide (IL2) have been synthesized and studied as a potential corrosion inhibitor towards carbon steel in 1 M HCl solution saturated with carbon dioxide. IL1 and IL2 were synthesized using microwave assisted organic synthesis (MAOS) method. Mass Spectrometry analysis of IL1 and IL2 showed molecular mass [M-H+] peak at 223.2166 and 251.2484, respectively. The FTIR, 1 H-NMR and 13 C-NMR spectra confirmed that IL1 and IL2 were successfully synthesized. Corrosion inhibition activity of IL1 and IL2 were determined using weight loss method. The results showed that IL1 and IL2 have the potential as good corrosion inhibitors with corrosion inhibition efficiency of IL1 and IL2 are 96.00% at 100 ppm (343 K) and 95.60% at 50 ppm (343 K), respectively. The increase in the concentration of IL1 and IL2 tends to improve their corrosion inhibition activities. Analysis of the data obtained from the weight loss method shows that the adsorption of IL1 and IL2 on carbon steel is classified into chemisorption which obeys Langmuir's adsorption isotherm.

Development of a Zwitterionic Compound Derived from β-Amino Acid as a Green Inhibitor for CO2Corrosive Environments

“…However, despite the efforts, the high toxicity of some of these molecules, including recently developed ionic liquids (IL) such as 1-octyl-3-methyl­pyridinium bromide, precludes their use as corrosion inhibitors specifically in acidic mediums due to new generation of environmental regulations as their EC 50 values are around 1 to 2 ppm even though can reach significant corrosion inhibiting efficiency (>80%). , On the other hand, the environmental impact of the synthetic procedures used to obtain such corrosion inhibitors must be also taken into account due to intensive use of toxic raw materials and solvents, as well as the production of byproducts and waste matter in general and the intensive use of energy. − …”