Degradation of aqueous piperazine in carbon dioxide capture |
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Authors: | Stephanie A. Freeman Jason Davis Gary T. Rochelle |
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Affiliation: | 1. Telemark University College, kjølnes ring 56, 3918Porsgrunn, Norway;2. Tel-Tek, Kjølnes ring 30, 3918 Porsgrunn, Norway;1. Pickle Research Campus, The University of Texas at Austin, 10100 Burnet Rd., Bldg 133, R7100, Austin, TX, USA;2. McKetta Department of Chemical Engineering, The University of Texas at Austin, 200 E. Dean Keeton St., C0400, Austin, TX 78712-1589, USA;1. Faculty of Technology, Telemark University College, Kjølnes ring 30, 3918 Porsgrunn, Norway;2. Key laboratory for Green Chemical Process of Ministry of Education, Wuhan Institute of Technology, Xiongchu Avenue 693, 430073 Wuhan, China |
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Abstract: | Concentrated, aqueous piperazine (PZ) is a novel solvent for carbon dioxide (CO2) capture by absorption/stripping. One of the major advantages of PZ is its resistance to thermal degradation and oxidation.At 135 and 150 °C, 8 m PZ is up to two orders of magnitude more resistant to thermal degradation than 7 m monoethanolamine (MEA). After 18 weeks at 150 °C, only 6.3% of the initial PZ was degraded, yielding an apparent first order rate constant for amine loss of 6.1 × 10?9 s?1. PZ was the most resistant amine tested, with the other screened amines shown in order of decreasing resistance: 7 m 2-amino-2-methyl-1-propanol, 7 m Diglycolamine®, 7 m N-(2-hydroxyethyl)piperazine, 7 m MEA, 8 m ethylenediamine, and 7 m diethylenetriamine. Thermal resistance allows the use of higher temperatures and pressures in the stripper, potentially leading to overall energy savings.Concentrated PZ solutions demonstrate resistance to oxidation compared to 7 m MEA solutions. Experiments investigating metal-catalyzed oxidation found that PZ solutions were 3–5 times more resistant to oxidation than MEA. Catalysts tested were 1.0 mM iron (II), 4.0–5.0 mM copper (II), and a combination of stainless steel metals (iron (II), nickel (II), and chromium (III)). Inhibitor A reduced PZ degradation catalyzed by iron (II) and copper (II). |
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