The impurities effect on thermal degradation and corrosivity of amine solution in South Pars gas sweetening plants

•Pore study on various kind of corrosion that occurred in amine treatment unit.•Investigation on the salt concentration effect on corrosion rate.•Study the indirect effect of MEG on corrosion.•Presenting some useful and real industrial trends and data for further investigation.

Large amount of thermal degraded products, heat stable salts, oxygen and CO2 presence in amine solution, is the main causes of corrosion problems in the gas processing plant. Recent inspection of the gas sweetening process equipment showed that significant corrosion has occurred in the bottom sections of the rich amine regenerators and reboilers as well as the piping connecting the reboilers and the regenerators. Corrosion resulted in a leak in the vapor return line from the reboiler to regenerator. The object of the present investigation is (a) to focus on the Different impurity in amine cycle and insights that have been gained from observations of sour gas sweetening processes in South Pars gas processing plant (b) to discuss the effect of impurities on the thermal degradation and corrosivity of amine solution, (c) to analyze some of the volatile degradation products by mass spectrometry and (d) from the available experimental evidence suggest a corrosion prevention method.