Utilization of Sulfur Oxides for the Production of Sodium Sulfate

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2002-01-01
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Satrio, J.A.B.
Jagtap, S.B.
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Chemical and Biological Engineering

The function of the Department of Chemical and Biological Engineering has been to prepare students for the study and application of chemistry in industry. This focus has included preparation for employment in various industries as well as the development, design, and operation of equipment and processes within industry.Through the CBE Department, Iowa State University is nationally recognized for its initiatives in bioinformatics, biomaterials, bioproducts, metabolic/tissue engineering, multiphase computational fluid dynamics, advanced polymeric materials and nanostructured materials.

History
The Department of Chemical Engineering was founded in 1913 under the Department of Physics and Illuminating Engineering. From 1915 to 1931 it was jointly administered by the Divisions of Industrial Science and Engineering, and from 1931 onward it has been under the Division/College of Engineering. In 1928 it merged with Mining Engineering, and from 1973–1979 it merged with Nuclear Engineering. It became Chemical and Biological Engineering in 2005.

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1913 - present

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  • Department of Chemical Engineering (1913–1928)
  • Department of Chemical and Mining Engineering (1928–1957)
  • Department of Chemical Engineering (1957–1973, 1979–2005)
    • Department of Chemical and Biological Engineering (2005–present)

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Abstract

The use of coal and other fossil fuels generates large quantities of sulfurous byproducts which could find an outlet in the manufacture of Na2SO4. In this work, the feasibility of converting SO2 and SO3 into Na2SO4 by employing modern technology, i.e., a fluidized-bed reactor, was investigated. Bench-scale and larger fluidized-bed reactors were used to study the reaction of SO2 or SO3 with NaCl, steam, and air at temperatures ranging from 400 to 600 °C. Because the rate of reaction of SO2 with salt as in the Hargreaves process proved too low to be practical, only the results of reacting SO3 are reported. Reasonable rates of reaction and trouble-free operation were generally achieved by employing SO3 concentrations in the range of 1−3 vol % and temperatures in the range of 500−600 °C. With higher SO3 concentrations and lower temperatures, particle agglomeration and bed caking took place as a result of the formation of lower melting point byproducts believed to be NaHSO4 and Na2S2O7. This problem was overcome in some cases by increasing the fluidizing gas velocity and/or bed turbulence. Therefore, better results were achieved with gas distributors which created more turbulence. Through selection of appropriate reaction conditions and careful design of the gas distributor, the technical feasibility of the process seems assured. Furthermore, because similar results were achieved with reactors which differed greatly in size, the scale-up to larger reactors should be straightforward.

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Reprinted (adapted) with permission from Ind. Eng. Chem. Res., 2002, 41 (15), pp 3540–3547. Copyright 2002 American Chemical Society.

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Tue Jan 01 00:00:00 UTC 2002
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