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Volume :19 Issue : 1 1992      Add To Cart                                                                    Download

Inhibiting corrosion in crude oil distillation units by heterocyclic compoundsa

Auther : F. M. AL-KHARAFIb AND FAROUK H. AL-HAJJAR

Petroleum, Petrochemical and Materials Division, Kuwait Institute for Scientific Research, P.O. Box 24885, Safat 13109, Kuwait

 

ABSTRACT

 

The behaviour of 3-amino-1,2,4-triazole (ATR) 2-amino-thiazole (ATH) and one commercial mixture (H1) as corrosion inhibitors for carbon steel exposed to export grade Kuwaiti crude oil was studied in a crude oil distillation pilot plant (DISTOP 100) using ammonia gas as a neutralizing agent. The results show that the presence of 10 ppm of (ATR) or (ATH) decreased the corrosion rate of carbon steel by >90%. However, the commercial inhibitor (H1) inhibited the corrosion of carbon steel by 84% under the same experimental conditions. X-ray photoelectron spectroscopy showed that the corrosion inhibition of carbon steel by (ATR) or (ATH) is attributed to the formation of iron complex layer compounds on the metal surface. SEM micrograph of the surfaces of the specimens tested in the presence of (ATR) or (ATH) showed the formation of a relatively smooth thin film, free from localized areas of attack compared to the blank specimen.

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