Carbochlorination of metal oxides using a fused salt slurry reactor
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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.
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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)
- College of Engineering(parent college)
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Abstract
The carbochlorination of alumina and fly ash slurried with carbon in a NaCl-AlCl(,3) fused salt using chlorine was investigated at temper- atures between 530 and 800(DEGREES)C. The chlorination rates for up to 85g of alumina or 25g of fly ash in 375g of fused salt containing as much as 45g carbon were determined. Alumina chlorination rates ranging from 2.1(10('-4)) to 1.7(10('-3)) g-moles min('-1) were observed at tempera- tures between 530 and 800(DEGREES)C using a carbon loading of 12.86g. Recoveries of 73% Al(,2)O(,3), 83% Fe(,2)O(,3), 60% TiO(,2) and 25% SiO(,2) were obtained by chlorinating fly ash for 1 hr at 750(DEGREES)C in a melt containing 40% AlCl(,3);The chlorination of alumina was found to be strongly influenced by temperature, and carbon loading. The reaction was gas-liquid mass transfer controlled above 650(DEGREES)C and was reaction controlled at the carbon surface below 600(DEGREES)C. A change in the reaction mech- anism at 650(DEGREES)C is attributed to the stability of phosgene. There was also evidence of a reduction in the carbon reactivity with time. At temperatures above 650(DEGREES)C the ratio of carbon to alumina influenced the gas-liquid mass transfer of chlorine;The chlorination of fly ash at 750(DEGREES)C using a melt containing 40% AlCl(,3) was found to selectively chlorinate alumina with respect to silica at a weight ratio of 5.46 compared to a 2.55 ratio using a melt containing 48% AlCl(,3). The chlorination of iron and titanium oxides was not affected by the melt composition;Based on the results of the study, a preliminary design was developed for the chlorination of 10('4) Kg fly ash hr('-1) in a bubble;column reactor operating at 2.25 atm with a total slurry volume of 21 m('3); * DOE Report IS-T-1220. This work was performed under contract No. W-7405-Eng-82 with the U.S. Department of Energy, and sup- ported in part by the Iowa State Mining and Mineral Resources and Research Institute under U.S. Bureau of Mines Allotment Grants G1144119 and G1154119.