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OXIDATIVE REGENERATION OF SULFIDED SORBENT BY H2S WITHOUT EMISSION OF SO2
Korean Journal of Chemical Engineering, January 1995, 12(1), 23-28(6), 10.1007/BF02697702
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Abstract
Much SO2, another perilous air pollutant, was emitted during the oxidative regeneration of sulfided sorbent by H2S. In order to prevent emission of SO2, we carried out oxidative regeneration with the physical mixture of CaO and sulfided sorbent and investigated the effect of regeneration temperature and oxygen concentration on the reactivity of CaO with SO2. The effluent gases were analyzed by G.C. and the properties of sorbent were characterized by XRD, SEM, TG/DTA and EPMA. Deterioration of reactivity of CaO with SO2 resulted in increment of emission of SO2 due to the structural changes of CaO above 750℃ and that at 850℃ was more severe. Furthermore EPMA and XRD analysis revealed that product layer diffusion through the solid product, CaSO4, was the rate limiting step for CaO sulfidation. The reaction of CaO with SO2 was first order approximately and that was accelerated by high O2 concentration.
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References
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Lee YS, Yoo KO, Gavalas GR, Korean J. Chem. Eng., 8(4), 214 (1991)
Choi YJ, Lee YS, Kim HT, Yoo KO, HWAHAK KONGHAK, 30(4), 433 (1992)
Park DH, Lee YS, Kim HT, Yoo KO, HWAHAK KONGHAK, 30(6), 700 (1992)
Lee YS, Yoo KO, HWAHAK KONGHAK, 31(6), 753 (1993)
Cannon KJ, Denbigh KG, Chem. Eng. Sci., 145 (1957)
Schrodt JT, Best JE, AIChE Symp. Ser., 74(175), 184 (1978)
Tseng SC, Tamhankar SS, Wen CY, Chem. Eng. Sci., 36, 1287 (1981)
Grindley T, Steinfeld G, Research Report, DOE/MC/16545-1125 (1982)
Sohn HY, Kim DS, Metallurgical Transactions B, 18, 451 (1987)
Marsh DW, Ulrichson DL, Chem. Eng. Sci., 40(3), 423 (1985)
Kojima T, Take K, Junii D, Furusawa T, J. Chem. Eng. Jpn., 18(5), 432 (1985)
Brogwardt RH, Bruce KR, AIChE J., 32(2), 239 (1986)
Stouffer MR, Yoon HY, AIChE J., 35(8), 1253 (1989)
Irabien A, Cortabitarte F, Viguri J, Ortiz MI, Chem. Eng. Sci., 45(12), 3427 (1990)
Milne CR, Silcox GD, Pershing DW, Kirchgessner DA, Ind. Eng. Chem. Res., 29(2), 139 (1990)
Tambe S, Gaurl KL, Li S, Cobourn WG, Environ. Sci. Technol., 25(12), 2071 (1991)
Marcilly C, Courty P, Delmon G, J. Am. Ceram. Soc., 53, 56 (1970)
Fields RB, Burdett NA, Davidson JF, Trans. J. Chem. Eng., 57, 276 (1979)
Hatfield JD, Dim YK, Mullins RC, McClellan GH, NTIS. Publications, PB202, 407 (1970)
Christman PG, Edgar TF, AIChE Meeting, New Orleans (1981)
Borgwardt RH, Chem. Eng. Sci., 44(1), 53 (1989)
Silcox GD, Kramlich JC, Pershing DW, Ind. Eng. Chem. Res., 28, 155 (1989)
Dario B, Luigi B, J. Am. Ceram. Soc., 63(7), 8 (1980)
Irabien A, Viguri JR, Cortabitarte F, Oriz I, Ind. Eng. Chem. Res., 29(8), 1606 (1990)
Newton GW, Ph.D. Thesis, The University of Utah, Salt Lake City (1986)
Pigford RL, Sliger G, Ind. Eng. Chem. Process Des. Dev., 12, 85 (1973)
Bhatia SK, Perlmutter DD, AIChE J., 27(2), 226 (1981)
Borgwardt RH, Bruce KR, Blake J, Ind. Eng. Chem. Res., 26(10), 1993 (1987)
Bruce KR, Borgwardt BH, AIChE J., 32(2), 239 (1986)
Hsia C, Pierre GR, Raghunathan K, Fan LS, AIChE J., 39(4), 698 (1993)
