Investigation of volatile corrosion inhibitors using a facile method

Md. Badiuzzaman Biddut, Nushrat Jahan Rinky, Md Mayeedul Islam

Abstract

Top-of-the-line corrosion (TLC), a significant form of vapor phase corrosion (VPC), is a major concern in oil and gas transportation pipelines operating under stratified flow conditions. Conventional inhibitors used in these pipelines cannot reach the top portion due to their low volatility. In this study, a novel experimental setup was developed to investigate TLC. Azole-based compounds were initially screened and subsequently evaluated for their effectiveness in inhibiting TLC using this new setup. The experiments were conducted at 30 °C surface temperature and at varying gas temperatures of 40 °C, 50°C and 60°C. The results demonstrate that the setup is capable of accurately measuring TLC, water condensation rates, and droplet retention time, while also providing precise control over sample surface and gas temperatures. A Vapor Inhibiting Ability (VIA) test identified benzothiazole as a more effective VPC inhibitor compared to 2-aminothiazole and 2-mercaptobenzothiazole. Benzothiazole was found to reduce TLC by 80% under CO₂ conditions. Additionally, a new spectroscopic method was proposed to measure the concentration of VCIs in the condensed liquid, revealing that a significant amount of VCI co-condensed with the liquid.

Conclusion

· The newly designed TLC cell setup effectively measures top-of-the-line corrosion (TLC) using the linear polarization technique and quantifies Fe²⁺ concentration in the collected condensed liquid. This setup also measures condensation rates, droplet retention times, and allows precise control of both sample surface temperature and gas temperature. · Simple vapour inhibiting ability (VIA) tests indicate that 2-aminothiazole, 2-mercaptobenzothiazole, and benzothiazole can effectively prevent bottom-of-the-line corrosion, achieving an inhibition efficiency exceeding 85%. However, for top-of-the-line corrosion, benzothiazole demonstrates superior efficiency (53%) compared to the other inhibitors, making it a promising candidate for mitigating vapour phase corrosion. · Under top-of-the-line conditions, the inhibition efficiency of benzothiazole is concentration-dependent, as determined by our newly designed TLC setup. Maximum inhibition efficiency under TLC condition is found to reach about 80% at 1000 ppm. · For the first time, a straightforward method has been introduced for determining inhibitor concentration in the collected condensed liquid. It reveals that a significant amount of inhibitor is co-condensed with water.

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