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Carbochlorination of dispersed oxides in a molten salt reactor.
AIChE J 1988 Jul; 34(7):1086-1093
Reaction mechanism and rates were determined from 803 to 1,073 K for the carbochlorination of Al2O3 and of Al, Si, and Fe-mixed oxides using Cl2 and C slurried in a stirred melt of NaCl--AlCl3. Alumina chlorination rates of 0.33-2.0 X 10-8 kmol/s were obtained using C:melt weight ratios between 1:21 and 1:42. The reaction rate was proportional to C loading at temperatures below 923 K, while gas-liquid mass transfer was rate controlling at higher temperatures. Carbochlorination of the combined oxides in coal fly ash at 923 K and oxide conversions less than about 50 pct was also gas-liquid mass-transfer-controlled. At higher conversions, dissolution became the rate-controlling factor. A 40 pct (molar) AlCl3 melt was more effective than a 48 pct AlCl3 melt for the selective chlorination of Al2O3 over SiO2. Research was done at Iowa State University under Grants G1144119 and G1154119.
Oxides; Reaction rates; Aluminum; Silicon; Iron; Alumina; Coal; Fly ash; Chlorine; Carbon; Sodium; Sodium compounds; Aluminum compounds; Silicon compounds
1344-28-1; 7429-90-5; 7439-89-6; 1345-25-1; 1309-37-1; 7440-21-3; 7440-23-5; 7647-14-5
OP; Journal Article
MIR-9-90; Grant-G1144119; Grant-G1154119
Issue of Publication
Iowa State University
Page last reviewed: April 12, 2019
Content source: National Institute for Occupational Safety and Health Education and Information Division