06576 PREDICTION AND ASSESSMENT OF AMMONIUM BISULFIDE CORROSION UNDER REFINERY SOUR WATER SERVICE CONDITIONS

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Product Number: 51300-06576-SG

ISBN: 06576 2006 CP

Author: Richard J. Horvath, Michael S. Cayard, Russell D. Kane

Publication Date: 2006

Industry: Materials Selection and Design

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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. The impacts of several process variables on corrosion were quantified. Key learnings support a paradigm shift from the rules of thumb previously applied to these systems. Data collected were used to develop a software tool to predict the corrosion rate of 14 materials evaluated in the program.

Keywords: sour water, ammonium bisulfide, NH 4 HS, hydrogen sulfide, H 2 S, partial pressure, isocorrosion diagram, temperature, chloride, hydrocarbon, velocity, wall shear stress, ammonium polysulfide, APS, imidazoline, materials selection, software, reactor effluent air cooler, REAC, hydroprocessing, refining

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2006 Conference Papers (493)
,
Conference Papers (10927)
,
Downloadable (7813)
,
chloride (48)
,
hydrogen sulfide (91)
,
wall shear stress (8)
,
temperature (29)
,
partial pressure (5)
,
sour water (5)
,
ammonium bisulfide (5)
,
isocorrosion diagram (2)
,
velocity (3)
,
nh 4 hs (1)
,
h 2 s (1)
,
hydrocarbon (4)
,
aps (1)
,
reac (6)

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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).

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Summarizes results from Phase III of the joint industry program (JIP) on refinery alkaline sour water (ammonium bisulfide) corrosion. Phase III included a comprehensive engineering analysis of data from all three phases of the Sour Water JIP.