The filter elements are constructed of Type 304. The regenerator reboiler usually requires stainless, either Type 430 or 304, because of the higher temperatures involved.ĭiethanolamine (DEA) is reconstituted using a precoat filter and treating heat-stable salts of DEA with soda ash. The original carbon steel is then frequently replaced with stainless, beginning with Type 410 and then increasing to Types 430 and 304. Thus, the hydrogen sulfide content of the rich amine solution increases and the corrosion problems get worse. As with most plants, there is a tendency to build the unit too small, and, as it gets older, its capacity is increased. The corrosion problem depends largely on the concentration of hydrogen sulfide. In modern gas processing plants, the rich/lean exchanger train is often constructed initially of carbon steel. Schematic of an olamine unit (amine unit) for gas cleaning.
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