October 2001

Gas Processing

Improve contaminant control in amine systems

These guidelines illustrate what every process engineer should know about solvent contamination and loss for sour gas processing facilities

Abdi, M. A., Memorial University of Newfoundland, St. John's; Golkar, M. M., National Iranian Oil Co.; Meisen, A., Memorial University of Newfoundland

Most sour-gas processing facilities separate hydrogen sulfide (H2S) and carbon dioxide (CO2) from raw gas through chemical absorption using alkanolamines (or "amines"). The prime alkanolamines are: monoethanolamine (MEA), diethanolamine (DEA), methyldiethanolamine (MDEA), diisopropanolamine (DIPA), and diglycolamine (DGA). The amine processes are cyclical-involving both absorption and desorption steps-to reuse absorbents. Because these processes are closed loop, nonregenerable contaminants accumulate within the system and can cause reduced processing efficiencies and operational problems. Operational difficulties include: corrosion, foaming, solid deposition, losses of valuab

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