PTQ Q4 2023 Issue

unfortunately, this only solved part of the problem. Severe corrosion and fouling were still observed, which is why one of the air coolers was regularly taken out of service for cleaning or repair work. To improve the situation, a combination of a water-sol- uble filmer and a strong base from the ACF Technology range was dosed into the wash water. The filmer provided a good protective effect on the metal surface, which sig- nificantly minimised corrosion. The ACF base prevented the deposition of ammonium salts and dissolved already- formed ammonium salts, which were then removed with the wash water. This improved the situation, resulting in significantly less fouling and more stable pressure curves (reactor, reactor effluent exchangers, air coolers). The customer was very satisfied with the results, which led to a multi-year treatment of the NHT with the combina- tion products of water-soluble filmer and ACF technology. Figure 5 shows the thermographic scans of the three air coolers at a time interval of about two months. In practice, the product flow through the middle air cooler is signifi - cantly better compared to the two outer air coolers. This effect had also been observed before, as the two outer air coolers were fouled up more quickly in the past, and more corrosion was observed there. The two scans show some differences, but these were partly influenced by the differ - ent weather conditions in winter. Conclusions In the refining and petrochemical industries, filmers have

become well-established. By using certain additives, better run times, lower energy consumption, and fewer technical problems can be achieved. Selecting a suitable corrosion inhibitor is crucial, as not all additives perform equally in all applications. There are always pros and cons that must be carefully weighed when using them. Being able to com- bine multiple inhibitor functions is highly advantageous. Simultaneous corrosion protection and the prevention of salt deposits are a particular advantage. Another benefit is the ability to provide corrosion protection with simulta- neous mobilising properties (dispersant properties). This helps keep smaller components in suspension and thus prevent deposition. References 1 B Otzisk, M Urschey, Corrosion and fouling control in process equip - ment, PTQ Q4 2015. 2 B Otzisk, F Magri, J Achten, S Halsberghe, Preventing ammonium salt fouling and corrosion, PTQ Q4 2017. 3 S Kumar, B Otzisk, M Urschey, Managing ammonium salts corrosion and fouling, PTQ Q3 2021. 4 B Otzisk, A de Bache, Corrosion control in ethylene plants, PTQ Q1 2022. Berthold Otzisk is Senior Product Manager for refinery and petro - chemical applications with Kurita Europe, located in Germany. Email: berthold.otzisk@kurita-water.com Mohamed Hudhaifa is Local Technical Manager (LTM) for GCC coun - tries with Kurita AquaChemie, located in Saudi Arabia. Email: mohamed.hudhaifa@kurita-water.com

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