This paper summarizes results of a joint industry program (JIP) to address ammonium bisulfide (NH 4 HS) corrosion in H 2 S-dominated alkaline sour waters typically found in refinery services such as the reactor effluent air cooler (REAC) systems of hydroprocessing units.
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This Phase II work in NH3-dominated sour waters studied the impact of several process variables including NH4HS concentration, NH3 partial pressure, H2S partial pressure, temperature, cyanide concentration, and velocity (wall shear stress).
Variables that influence extent of vaporization of injected wash water & subsequent impact on minimizing the risk of corrosion. Consequences of liquid maldistribution in reactor effluent air coolers (REACs). Selecting between single and multiple injection points.