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Replacement of Commercial Anti-Corrosion Material with a More Effective and Cost Efficient Compound Based on Electrolytic System Simulation

Authors: Saeid Khajehmandali, Fattah Mollakarimi, Zohreh Seyf


There was a high rate of corrosion in Pyrolysis Gasoline Hydrogenation (PGH) unit of Arak Petrochemical Company (ARPC), and it caused some operational problem in this plant. A commercial chemical had been used as anti-corrosion in the depentanizer column overhead in order to control the corrosion rate. Injection of commercial corrosion inhibitor caused some operational problems such as fouling in some heat exchangers. It was proposed to replace this commercial material with another more effective trouble free, and well-known additive by R&D and operation specialists. At first, the system was simulated by commercial simulation software in electrolytic system to specify low pH points inside the plant. After a very comprehensive study of the situation and technical investigations ,ammonia / monoethanol amine solution was proposed as neutralizer or corrosion inhibitor to be injected in a suitable point of the plant. For this purpose, the depentanizer column and its accessories system was simulated again in case of this solution injection. According to the simulation results, injection of new anticorrosion substance has no any side effect on C5 cut product and operating conditions of the column. The corrosion rate will be cotrolled, if the pH remains at the range of 6.5 to 8 . Aactual plant test run was also carried out by injection of ammonia / monoethanol amine solution at the rate of 0.6 Kg/hr and the results of iron content of water samples and corrosion test coupons confirmed the simulation results. Now, ammonia / monoethanol amine solution is injected to a suitable pint inside the plant and corrosion rate has decreased significantly.

Keywords: Corrosion, Pyrolysis Gasoline, Simulation, Corrosion test copoun.

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[1] Manual of Pyrolysis Gasoline Hydrogenation Plant (PGH), Arak Petrochemical Company ,Iran, Vol. I &II , june 1991.
[2] S. Khajehmandali and R. Hassannezhad, "Simulation of Depenthaniser of Pyrolysis Gasoline Hydrogenation Plant in Arak Petrochemical Company Based on ElectrolyteSystem in order to Replacing Trademark Anticorrosion by Ammonia Solution in the Plant and Test Run," 10th National Iranian Chemical Engineering Congress Proceeding, Sistan&Balochestan University, Iran, October 21-23, 2005.
[3] R. D. Merrick, and T. Auerbach, "Crude Unit Overhead Corrosion Control," Materials Performance, September 1983, pp. 15.
[4] E.C. French, and W.F. Fahey, "Water Soluble Filming Inhibitor System for Corrosion Control in Crude Unit Overheads," Materials Performance, September 1983, pp. 9.
[5] J.G. Edmonson, and S.E. Lehrer, "Advances in Neutralizing Amine Technology," CORROSION/94, Paper # 514, NACE, Houston, Texas, 1994.
[6] P. R. Petersen, S. R. Lordo and G. R. McAteer, "Choosing a Neutralizing Amine Corrosion Inhibitor," PTQ, Summer 2004, pp. 121- 127.
[7] D. W. Green, and et al, "Perry's chemical engineers' handbook," 7th ed., New York, McGraw-Hill, 1997 , pp. 23-11.