Corrosion inhibition performance of copper carbonate in MEA- CO2 capture unit

Inhibition performance of copper carbonate (CuCO3) in carbon dioxide (CO2) absorption process using monoethanolamine (MEA) was investigated by conducting electrochemical corrosion experiments. It was found CuCO3 performs well under service conditions. Corrosion rate of carbon steel is held below 0.254 mmpy and its inhibition efficiency is at least 80%. The performance of CuCO3 is affected by process parameters, i.e. partial pressure of oxygen (O2), CuCO3 concentration, CO2 loading in solution, solution velocity, temperature, monoethanolamine concentration, cleanliness of the metal surface and degradation products of amine solutions.