Recent advances in the prediction, analysis and treatment of cyanides in fluid catalytic cracking units
- Unichem International Inc., The Woodlands, TX (United States)
- Lyondell-Citgo Refining Co. Ltd., Houston, TX (United States)
Cracking of carbon steel vessels operated under pressure has been identified as a major problem in the refining industry in recent years. Although approximately one-half of these cracks appear to be caused by weld defects generated during the original manufacture or subsequent repair of the vessels, the remainder have been found to be caused by hydrogen entry into the steel promoted by the presence of cyanide ions in solution. This paper will cover the development of a mathematical model used to evaluate and predict cyanide generating conditions in Fluid Catalytic Cracking Units wherein the cyanide concentrations employed were determined via a unique, proprietary method which will also be discussed. Combining these new analytical techniques provides a reliable cyanide monitoring method and when used in combination with a Modified Ammonium Polysulfide Solution (MAPS) and organic filming inhibitors, if needed, a comprehensive corrosion protection program for Fluid Catalytic Cracking Units.
- OSTI ID:
- 83059
- Report Number(s):
- CONF-940222-; TRN: IM9533%%481
- Resource Relation:
- Conference: Corrosion 94: National Association of Corrosion Engineers (NACE) international annual conference, Baltimore, MD (United States), 28 Feb - 4 Mar 1994; Other Information: PBD: 1994; Related Information: Is Part Of Corrosion/94 conference papers; PB: 5005 p.
- Country of Publication:
- United States
- Language:
- English
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