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Uneven Distribution of Metallic Ions in Deposits Precipitated in the Koshijihara DGA CO2 Removal Units
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Abstract
304 stainless steel has been suffering from general corrosion in CO2 removal units using a high concentration DGA solution in a natural gas processing plant. Deposits precipitated in the DGA units were sampled during annual inspections and analyzed for metallic ions and their compounds. It was found that Fe and Cr were rich in the deposits along the lean DGA lines and Ni was rich along the rich DGA lines. Fe and Cr precipitated as oxides and Ni precipitated as sulfides. This uneven distribution of metallic ions in the units was due to the differences in metal chelate stability with DGA and/or DGA carbamate and also due to the trace amount of H2S in the raw natural gas. There has not been a direct proof of carbamates playing some roles in an actual amine unit, this uneven distribution of metallic ions is one evidence that DGA carbamate really plays some roles in actual DGA units.
Title: Uneven Distribution of Metallic Ions in Deposits Precipitated in the Koshijihara DGA CO2 Removal Units
Description:
Abstract
304 stainless steel has been suffering from general corrosion in CO2 removal units using a high concentration DGA solution in a natural gas processing plant.
Deposits precipitated in the DGA units were sampled during annual inspections and analyzed for metallic ions and their compounds.
It was found that Fe and Cr were rich in the deposits along the lean DGA lines and Ni was rich along the rich DGA lines.
Fe and Cr precipitated as oxides and Ni precipitated as sulfides.
This uneven distribution of metallic ions in the units was due to the differences in metal chelate stability with DGA and/or DGA carbamate and also due to the trace amount of H2S in the raw natural gas.
There has not been a direct proof of carbamates playing some roles in an actual amine unit, this uneven distribution of metallic ions is one evidence that DGA carbamate really plays some roles in actual DGA units.
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