Corrosion Behaviour of Carbon Steel In Presence of New Generation of Heterocyclic Compounds Case Study: The Egyptian Minerals and Salts Company (Emisal)

Résumé

The Egyptian Minerals and Salts Company (EMISAL) located in Fayoum, Egypt, extract Sodium Sulfate from lake "Qaroun" water which contains Chloride and Sulfate ions as major components. The extraction process depends on the crystallization of Sodium Sulfate by cooling the lake saline solution up to -1C0. The crystallization occurs through consecutive crystallizers. Each crystallizer contains a tube- side made from Aluminum bronze or Titanium and a shell side made from Nickel aluminum bronze. The saline solution (Brine solution) which is rich in both Na*2*SO*4* and NaCl passes inside the tube where the cooling solution passes in the shell side around the tube. The solution inside the tube is subjected to cooling and continuous circulations under the effect of the circulation pumps. Consequently, the brine solution temperature is lowered from 25C0 to -1C0 and Sulfate is separated as Na*2*SO*4*.10H*2*0 whereas NaCl is still soluble in the solution and then used as cooling solution in the first crystallization stage. In the second crystallization stage, the cooling solution is mono ethylene glycol –water mixture, which pumped from the refrigeration units in lines made from carbon steel, due to drastic conditions during circulation process and the degradation of glycol to different types of organic acid mainly have small partial size. Moreover glycol has physical affect also increases the corrosive behaviour, the carbon steel lines are subjected to continuous corrosion, which lead to appearance of rusted iron in the cooling solution which results in a reduced efficiency of the cooling process. The anti-corrosion activity of the newly synthesized phthalazin compounds were covered the electrochemical behaviours of steel alloy cured in solution content a mixture of mono ethylene glycol and water content 67% which obtained in cooling system.

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