I n d . Eng. Chem. Res. 1992,31,434-439
434
1330-20-7; C P h , 108-90-7; H(CH2I6OH,111-27-3; CaCl,, 1004352-4; NaC1, 7647-14-5; KCl, 7447-40-7; LiC1, 7447-41-8; CuC12, 7447-39-4; NiC12,771854-9; BaC12, 10361-37-2; CrC13, 10025-73-7.
Landini, D.; Maia, A; Podda, G. Nonhydratd Anion Transfer from the Aqueous to the Organic Phase: Enhancement of Nucleophilic Reactivity in Phase-Transfer catalysis. J . Org. Chem. 1982,47,
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Corrosion Inhibition of Structural Steels in C 0 2 Absorption Process by Organic Inhibitor Composed of 8-Aminothiophenol, ( 1-Hydroxyethylidene)bis(phosphonic acid), and Diethanolaminet Isao Sekine,* Tetsuya Shimode, and Makoto Yuasa* Department of Industrial Chemistry, Faculty of Science and Technology, Science University of Tokyo, 2641 Yamazaki, Noda, Chiba 278, Japan
Koichi Takaoka Keiyo Plant Engineering Co., Ltd., 2-8-8 Zchikawa-minumi, Zchikawa, Chiba 272, Japan
Corrosion inhibition of mild steel (JISSS 41, UNS K02600) and stainless steel (type 304, UNS S30400) in hot K2CO3 solution containing 2-aminothiophenol (ATP) was investigated by physicochemical measurements. Inhibition for formation of FeCO, as scale was also investigated. The maximum value of inhibition efficiency (9) of corrosion for SS 41 in 50 ppm ATP solution under atmospheric conditions was ca.90% and was close to those obtained in solutions containing passivators of Na&kO, and V20,. In the mixed solutions of (a) ATP and (1-hydroxyethylidene)bis(phosphonic acid) (HEDP) and (b) ATP, HEDP, and diethanolamine (DEA), they exerted a cooperative effect of inhibition of SS 41. In a bench-scale test using the Benfield apparatus, the r] value of type 304 in the solution containing ATP under high pressure and temperature was ca. 95% and was similar to those obtained in solutions containing passivators. In solutions containing (a) ATP and HEDP and (b) ATP, HEDP, and DEA, HEDP inhibited the formation of FeC0, as scale. Introduction Hot, aqueous solution of potassium carbonate (K2C03) has been widely used in the process of removing carbon After absorbing C 0 2this solution leads to dioxide ((20,). 'This paper is second in a series on corrosion inhibition of structural steels in the C 0 2 absorption process by organic inhibitors. oaaa-5aa51921263 1-0434$03.00/
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a high corrosive property (Banks, 1967; Bienstock and Field, 1961) and is sensitive to stress corrosion cracking (SCC) (Forouris,1987; Johnson, 1987; Naito et al., 1978). Some inorganic compounds.suchas potassium bichromate (K2Cr20,), vanadium oxide (V,O,), and substrate with nickel (Ni) ion had been developed as corrosion inhibitors in the C 0 2 absorption process (Field and Bienstock, 1965; Gancy and Durling, 1978; Eickmeyer, 1969). However, 0 1992 American Chemical Society
Ind. Eng. Chem. Res., Vol. 31, No. 1, 1992 435 Table I. Chemical Compositions (in %) of 58 41 and Type 304 Used for Corrosion Weight Loss Tests steel C Si Mn P S Ni Cr SS 41 0.08 trace 0.35 0.014 0.018 type 304
