Recently, the amount of sulfur compounds such as H 2 S generated in the oil-refining process has increased. 1,2 Removing such compounds from the process is essential because H 2 S is the main cause of air pollution and has a fatal effect on the human body. For example, at 0.0057 ppm in the atmosphere, H 2 S causes eye and nasal symptoms, coughs, and headaches; at 250 ppm, it can damage organs and nervous systems and also deflate cellular metabolism. 3 Therefore, H 2 S should be discarded to avoid environmental pollution and increase process efficiency. Most factories use amine gas sweetening to remove sulfur compounds such as H 2 S generated during the crude-oil refining process. 4 Amines that absorb H 2 S in the amine gas sweetening process are degraded using high temperature in the regenerator and reused; this is called the amine regeneration process. The H 2 S absorption and regeneration mechanism of amines is caused by a difference in pKa; it is absorbed

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