In this communication, we will describe an integrated monoethylene (MEG)-reclaiming process using carbon steels metallurgy for most of the lines and vessels that handle MEG slurry solutions. Due to the potentially highly corrosive conditions in this type of facility, corrosion resistant alloys such as duplex stainless steels often constitute the preferred option for this process. The aim of this work is to check if carbon steels represent a viable alternative. Corrosion tests were conducted on carbon steel (UNS K02100) and a duplex stainless steel (UNS S32205) at 120°C in MEG solutions saturated with salts and containing suspended solids. The main parameters that were investigated are oxygen contamination, pH level from acid (close to pH 4) to alkaline (pH above 10), and the type of chemical used for pH control (NaOH and Na2CO3). The results show that carbon steel could be used in reclaiming application operating under certain conditions, provided that pH control is properly applied.

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