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10359 Prediction, Monitoring, and Control of Ammonium Chloride Corrosion in Refining Processes

Picture for 10359 Prediction, Monitoring, and Control of Ammonium Chloride Corrosion in Refining Processes
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 This paper presents a recent effort to further minimize the threat of corrosion by wet ammonium chloride salt.  Includes advances in  fundamental understanding salt behavior, predictive mdeling,  integration of models with process and operations.

Product Number: 51300-10359-SG
ISBN: 10359 2010 CP
Author: Adan Sun and Deyuan Fan
Publication Date: 2010
Industry: Corrosion Monitoring and Control
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Corrosion by wet ammonium chloride salt is a significant concern in many refining process units. Because corrosion rates typically experienced can be extremely high when all of the conducive conditions are met, every attempt is made to prevent this corrosion from occurring. This includes process design, corrosion resistant materials, and source control of chlorides. However, despite the best effort by the industry, ammonium chloride continues to pose a serious threat to the integrity of refining equipment and the process safety of refineries because the omnipresence of chlorides in a refinery. This paper presents a recent effort to further minimize this threat. It includes advances in the fundamental understanding of ammonium chloride salt behavior, predictive modeling effort based upon such fundamentals, the integration of such models with process and operating conditions in real-time, and guidance for inspection in search of this highly elusive corrosion phenomenon.

Keywords: ammonium chloride, dew point, dry point, corrosion prediction model, salt formation, ionic equilibria, hydroprocessing, distillation overhead systems

Corrosion by wet ammonium chloride salt is a significant concern in many refining process units. Because corrosion rates typically experienced can be extremely high when all of the conducive conditions are met, every attempt is made to prevent this corrosion from occurring. This includes process design, corrosion resistant materials, and source control of chlorides. However, despite the best effort by the industry, ammonium chloride continues to pose a serious threat to the integrity of refining equipment and the process safety of refineries because the omnipresence of chlorides in a refinery. This paper presents a recent effort to further minimize this threat. It includes advances in the fundamental understanding of ammonium chloride salt behavior, predictive modeling effort based upon such fundamentals, the integration of such models with process and operating conditions in real-time, and guidance for inspection in search of this highly elusive corrosion phenomenon.

Keywords: ammonium chloride, dew point, dry point, corrosion prediction model, salt formation, ionic equilibria, hydroprocessing, distillation overhead systems

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Product Number: 51317--9574-SG
ISBN: 9574 2017 CP
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This paper summarizes key case studies where Ammonium Chloride (NH4Cl) corrosion was observed. Best practices for process control and corrosion mitigation strategies have been recommended based on the learnings from these failures.

 
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01540 Impact of Ammonium Chloride Salt Deposition on Refinery Operations

Product Number: 51300-01540-SG
ISBN: 01540 2001 CP
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Evaluate Ammonium Chloride Corrosion Potential with Water Partial Pressure

Product Number: 51317--8960-SG
ISBN: 8960 2017 CP
Author: Huang Lin
Publication Date: 2017
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In conjunction with the water dew point line, a simplified ammonium chloride corrosion chart has been developed to evaluate ammonium chloride corrosion potential at different temperatures with different water partial pressures.
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