Sun-Tak Hwang

PROFESSOR

B.S. (ChE) Seoul National University, 1958

M.S. (ChE) University of Iowa, 1962

Ph.D. (ChE) University of Iowa, 1965

Phone: (513)556-2791, FAX: (513)556-1522
E-Mail: shwang@mail.cme.uc.edu

AWARDS

Ho-Am Award in Engineering (Korea), June 1, 1998
National Academy of Engineering of Korea, 2000
Distinguished Engineering Alumni Academy, University of Iowa, Member, June 2003

RESEARCH INTERESTS

Membrane Separations
Membrane Reactors
Flow through Porous Media
Gas Separations

Membrane Separations

Many membrane research projects are conducted in basic and applied areas, such as experimental investigation and computer simulation of the continuous membrane column; preparation of new ceramic membranes; and pervaporation applied to waste water treatment.

Membrane Reactors

Synergism between membrane separation and chemical reactions is sought. It is applied to equilibrium shift. Homogeneous and heterogeneous catalytic reactions are improved by a coupled membrane process.

Flow through Porous Media

Flow of gases and condensible vapors through porous media are studied. Knudsen diffusion, slip flow, surface diffusion, and flow of capillary condensate are taken into account for the overall flow mechanism. Non-Newtonian flow of polymer melts and solutions are also studied in resin transfer molding. This knowledge is applied in composite material manufacture.

Gas Separations

Oxygen separation from air, hydrogen purification from process gas mixtures, and hydrocarbon separations are being studied as they are very important in industry. Innovations are made in new separation devices including membrane units as economic and high efficiency methods of mixture separation.

RECENT PUBLICATIONS

· Hararya, K. and Hwang, S.T., "Permeation of Oxygen, Argon and Nitrogen through Polymer Membranes," J. Membrane Sci., 71, 13-27 (1992).

· Radovanovic, P., Thiel, S. and Hwang, S.T., "Formation of Asymmetric Polysulfone Membranes by Immersion Precipitation. Part II: The Effects of Casting Solution and Gelation Bath Compositions on Membrane Structure and Skin Formation," J. Membrane Sci., 65, 231-246 (1992).

· Chan, A. and Hwang, S.T., "Modeling Resin Transfer Molding of Axisymmetric Composite Parts," J. Materials Processing & Manufacturing Sci., 1, 105-118 (1992).

· Li, D. and Hwang, S.T., "Gas Separation by Silicon Based Inorganic Membrane at High Temperature," J. Membrane Sci., 66, 119-127 (1992).

· Shelekhin, A.B., Grosgogeat, E.J. and Hwang, S.T., "Gas Separation Properties of a New Polymer/Ceramic Composite Membrane," J. of Membrane Sci., 66, 129-141 (1992).

· Raghunath, B. and Hwang, S.T., "General Treatment of Liquid Phase Boundary Layer Resistance in the Pervaporation of Dilute Aqueous Organics through Tubular Membranes," J. Membrane Sci., 75, 29-46 (1992).

· Lee, K.R. and Hwang, S.T., "Separation of Propylene and Propane by Polyimide Hollow-Fiber Membrane Module," J. Membrane Sci., 73, 37-45 (1992).

· Chan, A. and Hwang, S.T., "Modeling Resin Transfer Molding of Axisymmetric Composite Parts," J. Materials Processing & Manufacturing Sci., 1, 105-118 (1992).

· Chan, A. and Hwang, S.T., "Modeling Resin Transfer Molding of PMR-15/Fiber Composites," Polymer Composites, 14, 524-528 (1993).

· Mercea, P. and Hwang, S.T., "Oxygen Separation from Air by a Combined Pressure Swing Adsorption and Continuous Membrane Column Process," J. Membrane Sci., 88,132-144 (1994).

· Ji, W., Sikdar, S.K., and Hwang, S.T., "Modeling of Multicomponent Pervaporation for Removal of Volatile Organic Compounds from Water," J. Membrane Sci., 93,1-19 (1994).

· Ji, W., Hilaly, A., and Hwang, S.T., "Optimization of multicomponent
pervaporation for removal of volatile organic compounds from water," J.
Membrane Sci., 97, 109-125 (1994).

· Hwang, S. T., "Production of High Purity Oxygen by Combination of Membrane
and PSA Methods," Membrane Journal, 4,1-8(1994).

· Ji, W., Sikdar, S.K., and Hwang, S.T., "Sorption, diffusion and permeation
of 1,1,1- trichloroethane through adsorbent-filled polymeric membranes," J.
Membrane Sci., 103, 243- 255(1995).

· Lee, K.R. and Hwang, S.T., "Separation of CFC-12 from air by polyimide
hollow-fiber membrane module," J. Membrane Sci., 105,177-185(1995).

· Li, Y. L., Pinto, N.G., Henderson, H. T., Hwang, S. T., and Nguyen, P., "Gas
permeabilities in thermally grown silicon dioxide films," Materials Sci. and
Engineering, B32, 63-68 (1995).

· Hwang, S.T., "Mechanisms of Gas Permeation through Microporous Membranes - A Review," Membrane Journal, 7 (1), 1-10 (1997).

· Bhattacharya, S. and Hwang, S.T., "Concentration Polarization, separation
factor, and Peclet number in membrane processes," J. Membrane Sci., 132,
73-90, (1997).

· Hwang, S.T., "Adsorbent-filled polymeric membranes," Macromol. Symp., 118, 407-412 (1997).

· Almquist, B.C. And Hwang, S.T., "The Permeation of Organophosphorous Compounds in Silicone Rubber membranes," J. Membrane Sci., 153, 57-69 (1999).

· Gabelman, A. and Hwang, S.T., "Hollow fiber membrane contactors," J. Membrane Sci., 159, 61-106 (1999).

· Mi, L. and Hwang, S.T., "Correlation of concentration polarization and hydrodynamic parameters in hollow fiber modules," J. Membrane Sci., 159, 143-165 (1999).

· Hwang, S.T., "Inorganic Membranes and Membrane Reactors," Korean J. Chem. Eng., 18(6), 775-787 (2001).

· Hwang, S.T., "Nonequilibrium Thermodynamics of Membrane Processes," AIChE J., 50 (4), 862-870 (2004).

· Wu, G., Almquist, B.C. and Hwang, S.T., "High Gas Permeability in Open-Structure Membranes," Korean J. Chem. Eng., 21 (2), 442-453 (2004)She, M. and Hwang, S.T., "Concentration of Dilute Flavor Compounds by Pervaporation: Permeate Pressure Effect and Boundary Layer Resistance Modeling," J. Membrane Sci., 236, 193-202 (2004).

· She, M. and Hwang, S.T., "Concentration of Dilute Flavor Compounds by Pervaporation: Permeate Pressure Effect and Boundary Layer Resistance Modeling," J. Membrane Sci., 236, 193-202 (2004).

· Hwang, S.T., "Nonequilibrium Thermodynamics of Membrane Processes," AIChE J., 50 (4), 862-870 (2004).

· Wu, G., Almquist, B.C. and Hwang, S.T., "High Gas Permeability in Open-Structure Membranes," Korean J. Chem. Eng., 21 (2), 442-453 (2004).

· She, M. and Hwang, S.T., "Concentration of Dilute Flavor Compounds by Pervaporation: Permeate Pressure Effect and Boundary Layer Resistance Modeling," J. Membrane Sci., 236, 193-202 (2004).

· Hwang, S.T., "Ambiguity and Non-uniqueness in Nonequilibrium Thermodynamics," Korean J. Chem. Eng., 22(1), 133-141 (2005).

· Gabelman, A., Hwang, S.T., and Krantz, W.B., "Dense gas extraction using a hollow fiber membrane contactor: experimental results versus model predictions," J. Membrane Sci. for the special issue on membrane contactors, 257, 11-36 (2005).
· Gabelman, A. and Hwang, S.T., "Experimental results versus model predictions for dense gas extraction using a hollow fiber membrane contactor," J. Supercritical Fluids, 35, 26-39 (2005).

· She, M. and Hwang, S.T., "Effects of concentration, temperature, and coupling on pervaporation of dilute flavor organics," J. Membrane Sci., 271, 16-28 (2006).

· Gabelman, A. and Hwang, S.T., "A theoretical study of dense gas extraction using a hollow fiber membrane contactor," J. Supercritical Fluids, 37, 157-172 (2006).

· She, M. and Hwang, S.T., "Recovery of key flavor compounds from real flavor concentrates by pervaporation," J. Membrane Sci., 279, 86-93 (2006).

· Lee, H.Y., Siladitya Ray Chaudhuri, William B. Krantz, and Sun-Tak Hwang, "A model for evaporative casting of polymeric membranes incorporating convection due to density changes," J. Membrane Sci., 284, 161-172 (2006).

· Gupta, V. K., Hwang, S.T. and Krantz, W.B., "Characterization of nanofiltration and reverse osmosis membrane performance for aqueous salt solutions using irreversible thermodynamics," Desalination, 208, 1-18 (2007).

PATENTS

Hwang, Sun-Tak, U.S. Patent #04,312,755, "Reverse Osmosis System", (1982).

Hwang, Sun-Tak, Canadian Patent #1,145,683, "Gas Phase Separation System", (1983).

Hwang, Sun-Tak, U.S. Patent #04,617,093, "Method and Apparatus for Separating Components of a Mixture" (1986).

Li D., Seok D.R., and Hwang S.T., U.S. Patent #04,828,588 "Process for Preparation of Heterogeneous Polysiloxane membrane and Membrane Produced," (1989).

Sikdar, S., Ji, W., and Hwang, S.T., U.S. Patent #6,117,328, "Adsorbent-filled Membranes for ervaporation," (2000)

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