Temperature Influence on High TAN Corrosion – A VGO Case Study (C2026-00205)
Tuesday, March 17, 2026
12:00 PM - 12:30 PM Central
Location: 342 DE
Earn .5 PDH
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High temperature activates and enhances the corrosive effects of sulfur compounds and naphthenic acids (NAP) inherently present in heavy crude oils. These corrosive processes involving sulfur and NAP have a significant impact on the distilling units integrity and consequently it becomes important to control and mitigate these corrosive effects. The main goal of this study was to investigate the temperature effect on NAP corrosivity in interaction with sulfur corrosion. Two distilling fractions with high NAP content were selected and tested in corrosion experiments done in a “flow-through” reactor at three distinct high temperatures similar or close to the operation conditions in oil distilling units. The factor time was also evaluated in this study as for each temperature level the test duration varied from 24 to 168 h. NAP corrosion and sulfur corrosion (sulfidation) were evaluated by measuring the iron and sulfur concentrations in samples collected during the tests. Scales (corrosion product) formed on metal samples, were analyzed using scanning electron microscopy and energy dispersive spectroscopy. The scales analysis and the collected kinetic data suggested that NAP and sulfur corrosion depend significantly on temperature variation but also on the chemical composition and on the concentrations in oil of two corrosive species.
