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Siderite corrosion protection for carbon steel infrastructure in post-combustion capture plants
HighlightsAt 40°C, siderite formation after 7days is successful for K2CO3 not 3° amine MDEA.At 80°C, siderite formation after 7days is superior in MDEA and AMP than K2CO3.Amine-formed siderite at 80°C offers excellent protection against 2.5M MEA at 80°C.Amine-formed siderite at 80°C offers good protection against 2.5M AEPZ at 80°C.K2CO3-formed siderite at 80°C shows wear and degradation from 2.5M MEA and AEPZ.
AbstractTo mitigate CO2 release, large-scale post-combustion capture with amine solvents is essential. To achieve capital cost savings, carbon steel infrastructure can replace stainless steel if corrosion by CO2-loaded amine solvents is controlled. A coating, to protect the carbon steel, formed using an amine (or additive) is beneficial because it can be regenerated. Siderite has been shown to form a protective crystalline product layer, created when Fe oxidised at the surface reacts with carbonate ions. Tertiary or sterically-hindered CO2-loaded amine solutions can form this layer. Herein siderite was prepared on carbon steel substrates from 5M methyldiethanolamine (MDEA), 5M 2-amino-2-methyl-1-propanol (AMP), and 1MK2CO3 at 40 and 80°C. At 40°C, K2CO3 produced the most successful protective siderite layer; by contrast, the amine solutions developed layers with interlocking crystals at 80°C. After siderite formation, these substrates were tested in 2.5M MEA and AEPZ, both highly corrosive but with more desirable capture kinetics. At 80°C, substrates pre-treated with MDEA or AMP showed good resistance against the corrosive actions of MEA and AEPZ for four weeks. The siderite layer reduced Fe oxidation at the surface and ingress of solution species thereby ceasing contact and corrosion.
Siderite corrosion protection for carbon steel infrastructure in post-combustion capture plants
HighlightsAt 40°C, siderite formation after 7days is successful for K2CO3 not 3° amine MDEA.At 80°C, siderite formation after 7days is superior in MDEA and AMP than K2CO3.Amine-formed siderite at 80°C offers excellent protection against 2.5M MEA at 80°C.Amine-formed siderite at 80°C offers good protection against 2.5M AEPZ at 80°C.K2CO3-formed siderite at 80°C shows wear and degradation from 2.5M MEA and AEPZ.
AbstractTo mitigate CO2 release, large-scale post-combustion capture with amine solvents is essential. To achieve capital cost savings, carbon steel infrastructure can replace stainless steel if corrosion by CO2-loaded amine solvents is controlled. A coating, to protect the carbon steel, formed using an amine (or additive) is beneficial because it can be regenerated. Siderite has been shown to form a protective crystalline product layer, created when Fe oxidised at the surface reacts with carbonate ions. Tertiary or sterically-hindered CO2-loaded amine solutions can form this layer. Herein siderite was prepared on carbon steel substrates from 5M methyldiethanolamine (MDEA), 5M 2-amino-2-methyl-1-propanol (AMP), and 1MK2CO3 at 40 and 80°C. At 40°C, K2CO3 produced the most successful protective siderite layer; by contrast, the amine solutions developed layers with interlocking crystals at 80°C. After siderite formation, these substrates were tested in 2.5M MEA and AEPZ, both highly corrosive but with more desirable capture kinetics. At 80°C, substrates pre-treated with MDEA or AMP showed good resistance against the corrosive actions of MEA and AEPZ for four weeks. The siderite layer reduced Fe oxidation at the surface and ingress of solution species thereby ceasing contact and corrosion.
Siderite corrosion protection for carbon steel infrastructure in post-combustion capture plants
Sedransk Campbell, Kyra L. (author) / Yu, Louis C.Y. (author) / Williams, Daryl R. (author)
International Journal of Greenhouse Gas Control ; 58 ; 232-245
2017-01-31
14 pages
Article (Journal)
Electronic Resource
English
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