Articles & Issues

Language: English

Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received August 21, 2006
Accepted November 14, 2006

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

All issues

Mass transfer and kinetics study on the sulfite forced oxidation with manganese ion catalyst

Zhao Bo^† Li Yan Zhuo Yuqun Tong Huiling Zhang Xiaowen Chen Changhe

Key laboratory for Thermal Science and Power Engineering of Ministry of Education,Department of Thermal Engineering, Tsinghua University, Beijing 100084, China

bobmail98@mails.tsinghua.edu.cn

Korean Journal of Chemical Engineering, May 2007, 24(3), 471-476(6), 10.1007/s11814-007-0082-y

Download PDF

Abstract

Wet limestone scrubbing is the most common flue gas desulfurization process (FGD) for control of sulfur dioxide emissions from the combustion of fossil fuels. Forced oxidation, which controls the overall reaction of the sulfur dioxide absorption, is the key path of the process. Manganese which comes from the coal is one of the catalysts during the forced oxidation process. In the present work, the two-film theory was used to analyze the sulfite forced oxidation reaction with an image boundary recognition technique, and the oxidation rate was experimentally studied by contacting pure oxygen with a sodium sulfite solution. There was a critical sulfite concentration 0.328 mol/L without catalyst or at a constant catalyst concentration value. The kinetics study focused on the active energy of the reaction and the reaction constant k; furthermore, we obtained the order with respect to the sulfite and Mn2+ concentrations. When the Mn2+ catalyst concentration was kept unchanged, the sulfite oxidation reaction rate was controlled by dual film and the reaction kinetics was first order with respect to sulfite while SO₃^2- concentration was below 0.328mol/L; the sulfite oxidation reaction rate was controlled by gas film only and the reaction kinetics was zero order with respect to sulfite while SO₃^2- concentration over 0.328mol/L. When SO₃^2- concentration was kept unchanged, the sulfite oxidation reaction rate depended on gas-liquid mass transfer and the reaction kinetics was different in various stages with respect to Mn2+ concentrations.

Keywords

Kinetics Forced Oxidation Mass Transfer Manganese Ion Catalyst

References

Linek V, Vacek V, Chem. Eng. Sci., 36, 1747 (1981)
Whitman WG, Chem. and Met. Eng., 29, 147 (1923)
Higbie R, Trans. Am. Inst. of Chem. Eng., 31, 365 (1935)
Danckwerts PV, Ind. Eng. Chem. Res., 43, 1460 (1951)
Toor HL, Marchello JM, AIChE J., 16, 513 (1970)
Weisnicht WL, Overman L, Wang CC, Wang HL, Erwin J, Hudson JL, Chem. Eng. Sci., 35, 463 (1980)
Pasiuk-Bronikowska W, Bronikowski T, Chem. Eng. Sci., 36, 215 (1981)
Huss A, Lim PK, Eckert CA, J. Phys. Chem., 86, 4224 (1982)
Pasiuk-Bronikowska W, Ziajka J, Chem. Eng. Sci., 40, 1567 (1985)
Ulrich RK, Rochelle GT, Prada RE, Chem. Eng. Sci., 41, 2183 (1986)
Bronikowski T, Pasiuk-Bronikowska W, Chem. Eng. Sci., 44, 1361 (1989)
Ziajka J, Pasiuk-Bronikowska W, Chem. Eng. Sci., 44, 915 (1989)
Lancia A, Musmarra D, Prisciandaro M, Tammaro M, Chem. Eng. Sci., 54(15-16), 3019 (1999)
Lee HK, Deshwal BR, Yoo KS, Korean J. Chem. Eng., 22(2), 208 (2005)
Zhao B, Li Y, Tong HL, Zhuo YQ, Zhang L, Shi H, Chen CH, Chem. Eng. Sci., 60(3), 863 (2005)
Backstrom HLJ, J. Am. Chem. Soc., 49, 1460 (1927)
Danckwerts PV, Gas-liquid reaction, McGraw-Hill Publications, New York (1970)
Mishra GC, Srivastava RD, J. Appl. Chem. Biotechnol., 26, 401 (1976)
Shen DX, He ZY, Wang YR, Environ. Chem., 12, 99 (1993)