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The corrosivity of four mercaptans and selected crude oil fractions were measured in lab tests. Conclusion: Mercaptan corrosion can contribute significantly to the total sulfur related corrosion in the temperature range 235–300°C, which agrees with observations of elevated temperature corrosion in refinery distillation equipment.
Measured corrosion rates of carbon, low alloy, and stainless steels are significantly higher than that predicted by the modified McConomy curves in cases where significant concentrations of mercaptans are present in crude oils and hydrocarbon condensates. It suggested that these organic sulfur containing hydrocarbons cause higher corrosion rates than sulfur species in general. The corrosivity of four different mercaptans and selected crude oil fractions were measured in laboratory tests. It was concluded that mercaptan corrosion can contribute significantly to the total sulfur related corrosion in the temperature range 235–300°C, which agrees with observations of elevated temperature corrosion in refinery distillation equipment. The consequences for refinery equipment are discussed for furnace piping and crude distillers.
Keywords: Mercaptan, sulfur, corrosion, sulfidation, McConomy curves, corrosivity, weight loss, coupon, corrosion test
The purpose of this paper will be to: (a) review published literature to characterize and classify speciation related to the types of impurities encountered in opportunity crudes; and (b) describe and categorize published case studies of corrosion in crude unit overhead operations.
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This paper helps answer some questions by surveying numerous units processing high naphthenic acid-containing feeds, e.g. feeds with high total acid number (TAN). The survey lists the unit temperatures, TAN’s, flow schemes, materials and corrosion history.
This paper discusses common amine sources and amine identification methods, the equipment commonly impacted and the steps which can be taken to address the challenge of amine contamination.