Spike recovery of heat stable salts in methyldiethanolamine (MDEA)


Natural gas processing involves removal of contaminants such as acidic gases including hydrogen sulfide (H2S) and carbon dioxide (CO2). These contaminants can cause corrosion to treatment plants. Acidic gases are removed by treatment with alkanolamine or alkylanolamines such as methyldiethanolamine (MDEA). The amine solutions absorb the acid gases, and are then removed from the natural gas. In addition to acid gases, other salt forming contaminants can also be absorbed. The amine solutions are then stripped of acid gases. Some of the absorbed contaminants are resistant to heating and are called heat stable salts (HSS). Some typical HSS include acetate, formate, sulfite, sulfate, oxalate, thiocyanate, and thiosulfate.

Keywords: Natural gas, acetate, formate, oxalate