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51318-11429-Formation of strong acids in dense phase CO2

Picture for Formation of strong acids in dense phase CO2
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Results from novel transparent autoclave experiments. Carbon steel corrosion coupons were exposed to impurities levels within established specifications at simulated transport conditions (25 °C and 10 MPa of CO2).

Product Number: 51318-11429-SG
Author: Bjørn Helge Morland / Morten Tjelta / Arne Dugstad / Gaute Svenningsen
Publication Date: 2018
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There are several proposed specifications for CO2 transport regarding how much impurities that could be allowed. Many of these specifications are based on health, safety, and environment (HSE) considerations in case of accidental spill with only limited focus on the pipeline integrity. Experimental testing has demonstrated that many of the impurities that are expected to be present in CO2 captured from a combustion process may react and form corrosive species.

The present paper discusses the results from novel transparent autoclave experiments. Carbon steel corrosion coupons were exposed to impurities levels within established specifications at simulated transport conditions (25 °C and 10 MPa of CO2). Reactions between the impurities at low level ppmv occurred and it seemed like several different reactions contributed the production of other compounds. The result was formation of nitric and sulfuric acid together with formation of elementary sulphur. Visual examination of the specimens indicated low corrosion, but the amount of acids and solids produced is not acceptable for a specification.

Keywords: CCS, CCUS, CO2 corrosion, carbon steel, CO2 specification, high pressure, impurities, NO2, SO2, H2S, O2, H2O.

There are several proposed specifications for CO2 transport regarding how much impurities that could be allowed. Many of these specifications are based on health, safety, and environment (HSE) considerations in case of accidental spill with only limited focus on the pipeline integrity. Experimental testing has demonstrated that many of the impurities that are expected to be present in CO2 captured from a combustion process may react and form corrosive species.

The present paper discusses the results from novel transparent autoclave experiments. Carbon steel corrosion coupons were exposed to impurities levels within established specifications at simulated transport conditions (25 °C and 10 MPa of CO2). Reactions between the impurities at low level ppmv occurred and it seemed like several different reactions contributed the production of other compounds. The result was formation of nitric and sulfuric acid together with formation of elementary sulphur. Visual examination of the specimens indicated low corrosion, but the amount of acids and solids produced is not acceptable for a specification.

Keywords: CCS, CCUS, CO2 corrosion, carbon steel, CO2 specification, high pressure, impurities, NO2, SO2, H2S, O2, H2O.

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11070 Transport of Dense Phase CO2 in C-Steel Pipelines – When is Corrosion an Issue?

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51313-02785-Dense Phase CO2 Corrosion and the Impact of Depressurization and Accumulation of Impurities

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51318-11481-Impacts of Impurities SO2 and H2S on Corrosion of sc-CO2 Pipe Steels

Product Number: 51318-11481-SG
Author: Yimin Zeng / Kaiyang Li / Jingli Lao / Muhammad Arafin
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This paper re-examines most public and in-house corrosion data on the effects of six typical impurities to advance the fundamental understanding of how pipeline steels corrode in sc-CO2 environments and identify knowledge gaps for further investigations.
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