Is your antifoam compatible with the amine system?
Several options help minimize operation costs and mitigate unscheduled shutdowns
The specific behavior of antifoam use was studied in a
particular plant. The goal was to find a solution for applying
the new antifoam for the best compatibility with amine systems.
A gas sweetening unit was installed to remove hydrogen sulfide
(H2S) contained in a high-pressure (HP) natural
gas stream. The solvent used for the H2S removal
from the gaseous stream was a 34 wt% diethanolamine (DEA)
solution, and the designed plant treating capacity was 250
million standard cubic feet per day (MMscfd) of HP sour gas.
Due to bad filtration and an improper antifoam selection, an
upset occurred that created foaming at the contactor tower. Six
months after the unit startup, the deferential pressure of the
lean/rich (L/R) exchanger was increased to 4 bar (allowed
limitation was 0.7 bar). An unplanned shutdown of the
sweetening plant occurred since cleaning was needed for the L/R
amine heat exchangers. It took maintenance 12 hours to do the
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