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GLOBAL MODEL FOR OPTIMIZING CROSSFLOW MICROFILTRATION AND ULTRAFILTRATION PROCESSES

United States Patent Application

20080017576
A1
View the Complete Application at the US Patent & Trademark Office
The present invention is a method for optimizing operating conditions for yield, purity, or selectivity of target species, and/or processing time for crossflow membrane filtration of target species in feed suspensions. This involves providing as input parameters: size distribution and concentration of particles and solutes in the suspension; suspension pH and temperature; physical and operating properties of membranes, and number and volume of reservoirs. The method also involves determining effective membrane pore size distribution; suspension viscosity, hydrodynamics, and electrostatics; pressure-independent permeation flux of the suspension and cake composition; pressure-independent permeation flux for each particle and overall observed sieving coefficient of each target species through cake deposit and pores; solving mass balance equations for all solutes; and iterating the mass balance equation for each solute at all possible permeation fluxes, thereby optimizing operating conditions. The invention also provides a computer readable medium for carrying out the method of the present invention.
Belfort, Georges (Slingerlands, NY), Baruah, Gautam Lal (Vernon Hills, IL), Venkiteshwaran, Adith (Troy, NY)
RENSSELAER POLYTECHNIC INSTITUTE (110 8th Street Troy NY 12180-3590)
11/ 760,407
June 8, 2007
[0002] This invention was developed with government funding under the U.S. Department of Energy (Grant DEFG02-90ER14114) and the National Science Foundation (Grant CTS-94-00610). The U.S. Government may retain certain rights.