There are several proposed specifications for CO2 transport regarding how much impurities that can be allowed in the CO2 stream. Many of these specifications are based on health, safety, and environment (HSE) considerations in case of accidental spill, and only limited focus has been on the pipeline integrity. Previous work has demonstrated that many of the impurities that are expected to be present in CO2 captured from flue gasses may react and form corrosive species. The present paper studied impurity reactions and corrosion under simulated transport conditions (25°C and 10 MPa of CO2). An experiment was performed in a transparent autoclave which allowed for in situ visual observation. Chemical reactions between the impurities were observed even at very low concentrations (<100 ppmv). These reactions contributed to the production of nitric and sulfuric acid together with formation of elemental sulfur. Corrosion was observed on coupons of carbon steel, but not on stainless steels. The corrosion rate of carbon steel was low, but the amount of acids and solids (corrosion products) produced cannot be accepted from a pipeline integrity perspective. Further experimental studies are needed to determine specific limits for impurity concentrations in captured CO2 for transport.
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1 November 2019
SCIENCE SECTION|
August 19 2019
Corrosion in CO2 Systems with Impurities Creating Strong Acids
Bjørn H. Morland;
Bjørn H. Morland
‡
*Department of Chemistry, University of Oslo, Sem Sælands vei 26, NO-0371 Oslo, Norway.
**Corrosion Technology Department, Instituttveien 18, NO-2007 Kjeller, Norway.
‡Corresponding author. E-mail: [email protected].
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Morten Tjelta;
Morten Tjelta
**Corrosion Technology Department, Instituttveien 18, NO-2007 Kjeller, Norway.
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Arne Dugstad;
Arne Dugstad
**Corrosion Technology Department, Instituttveien 18, NO-2007 Kjeller, Norway.
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Gaute Svenningsen
Gaute Svenningsen
**Corrosion Technology Department, Instituttveien 18, NO-2007 Kjeller, Norway.
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CORROSION (2019) 75 (11): 1307–1314.
Article history
Received:
November 21 2018
Revision Received:
August 17 2019
Accepted:
August 17 2019
Citation
Bjørn H. Morland, Morten Tjelta, Arne Dugstad, Gaute Svenningsen; Corrosion in CO2 Systems with Impurities Creating Strong Acids. CORROSION 1 November 2019; 75 (11): 1307–1314. doi: https://doi.org/10.5006/3110
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