Corrosion in Crude Oil Distillation Unit Overhead: A recent Case Study

Keywords: Ammonium chloride, Crude overhead, Dew point, HCl, Salt formation, Salt hydrolysis

Abstract

Despite all the technological advances and the control mechanisms that exist today to achieve the control of corrosion in overhead systems in atmospheric crude oil distillation units, there is still a high level of difficulty in predicting the phenomenon due to the complexity of the chemical compounds involved in the entire process. The study of this practical case aims to determine what control mechanisms should be optimized in a refinery located in the Autonomous Region of Iraqi Kurdistan to prevent corrosion phenomena’s in this specific system and how it should be done to achieve these improvements. It has been suggested that the corrosion mechanisms by hydrochloric acid and by ammonium chloride have been those that have acted in the operational context of the mentioned facility. To test this hypothesis, a study of the unit’s operational conditions and analytical tests were carried out on the construction material of various components and the products (sediments) found inside the tower. The results show that a lack of control in the salts and sediments content of the feed crude have caused an increase in the hydrolysis process of certain components upstream of the tower and thus the generation of acids and salts was promoted. On this basis, it is necessary to optimize the primary treatment of crude oil and update the chemical treatments and washing water systems to adapt to the new conditions of the feed of the refinery.

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Author Biography

Ari A. Ahmed, Department of Chemical Engineering, Firat University, Elazığ, Turkey

Ari Ahmed is a Chemical Engineer, actually working as Operations Manager in the Kurdistan Region Refinery Industry. He got the B.Sc. and a M.Sc. degrees in Chemical Engineering. His research interests are in Refinery Processes, Corrosion, Process Simulations, Plant Operations Optimization and Project Management.

References

Braden, V., Petersen, P., Malpiedi, M., Bowerbank, L. and Gorman, J., 1998. Crude Unit Overhead Corrosion Control. CORROSION Conference, NACE International, Houston, USA, Paper No. 98585.

Chambers, B., Yap, K., Srinivasan, S. and Yunovich, M., 2011. Corrosion in Crude Distillation Unit Overhead Operations: A Comprehensive Review. CORROSION Conference, NACE International, Houston, USA, Paper No. 11360.

Duggan, G. and Rechtien, R., 1998. Application of Ionic Equilibria Process Simulation for Atmospheric Distillation Overhead Systems. Corrosion/98, NACE International, Houston, TX, Paper No. 98586.

Eaton, P., Kaur, H. and Gray, M., 2009. Factors Affecting Salt Hydrolysis in Heavy Crude. Eurocorr/2009, Nice France, September, Paper No. 8295.

Fan, D., Fort, W., Shargay, C., Turner, J. and Messer, B., 2001. Design Considerations to Minimize Ammonium Chloride Corrosion in Hydrotreatment Reactions. Paper Presented at the CORROSION 2001, Houston, Texas, 01543.

Giesbrecht, V., Duggan, G. and Jackson, D., 2002. Effective Corrosion Control Techniques for Crude Unit Overheads. Corrosion/02, NACE International, Paper No. 02477.

Groysman, A. and Hiram, A., 1997. Corrosion Monitoring and Control in Refinery Process Units, Corrosion/97. NACE International, Houston, TX, Paper No. 97512.

Gutzeit, J., 2007. Controlling Crude Unit Overhead Corrosion Rules of Thumb for Better Crude Desalting. Corrosion/07, NACE International, Houston, TX, Paper No. 07567.

Kapusta, S., Ooms, A., Buijis, J., Fan, D. and Fort, W. 3rd., 2001. Systematic Approach to Controlling Fouling and Corrosion in Crude Unit Overheads and Hydrotreater Reactor Effluents. Corrosion/01, NACE International, Houston, TX, Paper No. 01535.

Lordo, S. and Eisenhawer, A., 2006. Sensitivity analysis for modeling overhead chloride salt deposition and corrosion issues. Journal of Physics: Conference Series, 1378, p.022089.

N.N., 2007. Corrosion Control in the Refining Industry Course Manual, Chapter 2: Crude Distillation and Desalting. NACE International, Houston, USA.

N.N., 2009. Crude Distillation Unit Distillation Tower Overhead System Corrosion, NACE International Publication 34109 (Task Group 342). NACE International, Houston, USA.

Rechtien, R. and Duggan, G., 2006. Identifying the Impacts of Amine Contamination on Crude Units, CORROSION Conference. NACE International, Houston, USA, Paper No. 06851.

Saab, M., Dias, O.C. and Faqeer, F.M., 2005. Damage Mechanisms and Corrosion Control in a Crude Unit Overhead Line. Corrosion/05, NACE International, Houston, TX, Paper No. 05566.

Schempp, P., Preub, K. and Troeger, M., 2016. About the correlation between crude oil corrosiveness and results from corrosion monitoring in an oil refinery. Corrosion, 72, pp.843-855.

Thornthwaite, P. and Davies, J., 2016. Monitoring and simulation resolves overhead corrosion. PTQ, 1, pp.53-63.

Published
2021-03-01
How to Cite
Ahmed, A. A. (2021) “Corrosion in Crude Oil Distillation Unit Overhead: A recent Case Study”, ARO-THE SCIENTIFIC JOURNAL OF KOYA UNIVERSITY, 9(1), pp. 21-27. doi: 10.14500/aro.10711.
Section
Articles