Kinetics of coal fly ash chlorination by phosgene
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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.
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)
- College of Engineering(parent college)
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Abstract
The kinetics of the reaction between phosgene and a fly ash composed of 97 weight percent alumina and silica has been studied over a temperature range of 450 to 800(DEGREES)C and a phosgene partial pressure range of 0.02 to 0.9 atm. A microbalance was used in obtaining initial conversion rate and extended conversion-time data, and B.E.T. surface areas and specific phosgene chemisorption weights as functions of conversion. Intrinsic kinetic parameters and a constant alumina to silica molar reaction ratio were determined over a fly ash conversion range of 0 to 0.375. The reaction is first order with respect to phosgene partial pressure. The shrinking-core model was successfully applied to predict fly ash conversion versus time data for the full phosgene partial pressure range and for temperatures up to 600(DEGREES)C. An activation energy of 40.8 kcal/g-M and a frequency factor of 4.7EO7 cm/min were used in the model;The results of the kinetic study were utilized in the preliminary design of a fly ash chlorination reactor. It is predicted that four reactors with beds 3 m in diameter and 2.36 m tall could process the 27 2,000 metric tons of fly ash collected annually by a 1000 megawatt power station. Spherical pellets with a diameter of 0.25 cm would be reacted at 700(DEGREES)C to recover 67 percent of the alumina and 13 percent of the silica.