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About the Authors Sathya Motupally is a graduate student in the Department of Chem- ical Engineering at the University of South Carolina. He worked as a student researcher for two-and-a- half years at the DuPont experi- mental station, on the chlorine recycle process. Dennie T. Mah is a Senior Engineering Consultant in E. I. DuPont de Nemours and Co. He was in charge of scale up of the elec- trolytic process. Francisco J. Freire is a Senior Engineering Associate in E. I. DuPont de Nemours and Co. He is the technical manager, in charge of commercialization of the elec- trolytic process. Dr. John W. Weidner is an asso- ciate professor in the Department of Chemical Engineering at the Univer- sity of South Carolina. protons and is transported to the cathode side. This phenomenon is called electro-osmotic drag and the amount of water transported across the membrane from the anode to the cathode increases with an increase in the applied current density. At any current density, the net flux of water across the membrane is equal to the flux from the cathode to the anode via diffusion minus the flux from the anode to the cathode via electro- osmotic drag. Therefore, the amount of water associated with the chlorine pro- duced decreases with an increase in the applied current density. This helps in attaining high current efficiencies even at high current operations. The DuPont electrolytic HCl process provides the chemical industry with a new and economical route to recover and recycle chlorine from the waste HCl produced. It is an example of how industrial-scale elec- trolysis can play a large role in making the chemical industry more environ- mentally friendly. ■ 1. 2. 3. 4. 5 6. 7. 8. 9. 10. 11. References F. Hine, Electrode Processes and Electrochem- ical Engineering, Plenum Press, NY, 127 (1985). M. Sittig, “Amines, Nitriles and Isocyanates: Processes and Products,” Chemical Tech- nology Review No. 31, Noyes Data Corpo- ration (1978). F. Wattimena and W. M. H. Sachtler, Stud. Surf. Sci. Catal., 7, 816 (1981). W. C. Schreiner, A. E. Cover, W. D. Hunter, C. P. Van Dijk, and H. S. Jongen- burger, Hydrocarbon Process., 53, 151 (1974). T. Yasuaki, Stud. Surf. Sci. Catal., 92, 41 (1995). R. Minz, “HCl-Electrolysis, Technology for Recycling Chlorine,” Bayer, AG, Confer- ence on Electrochemical Processing, Inno- vation and Progress, Glasgow, Scotland, UK (1993). J. A. Trainham, C. G. Law, J. S. Newman, K. B. Keating, and D. J. Eames, U.S. Pat. 5,411,641 (1995). D. T. Mah, Abstract No. 948, The Electro- chemical Society Meeting Abstracts, Vol. 96-1, Los Angeles, CA, May 5-10, 1996. J. Trainham and F. Freire, Paper 10c, 5th World Congress of Chemical Engineering, San Diego, CA, June 1996. D. J. Eames and J. S. Newman, J. Elec- trochem. Soc., 142, 3619 (1995). T. E. Spriner, T. A. Zawodzinski, and S. Gottes- feld, J. Electrochem. Soc., 138, 2334 (1991). 36 The Electrochemical Society Interface • Fall 1998PDF Image | RECYCLING CHLORINE FROM HYDROGEN CHLORIDE
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