PDF Publication Title:
Text from PDF Page: 086
CHAPTER V DEHYDRATION PERFORMANCE OF A NAFION⃝R MEMBRANE MODULE WITH A SHELL SIDE VACUUM 5.1 Introduction The regulation of water vapor has become increasingly important in recent years with much of the focus on the use of membrane sheets in polymer electrolyte fuel cells (PEFCs). However, as the number of applications requiring the same strict control as a PEFC increase, shell and tube membranes are being developed and investigated for use in the drying of process streams. Compared with other means of dehydration, such as the use of desiccant adsorbents, these shell and tube modules offer a potentially more energy efficient and compact method of dehydration. Of the materials that have been established for use in dehydration applica- tions, Nafion⃝R has a high water selectivity and wide application in electrochemical processes. Nafion⃝R is a copolymer of teflon and poly(perfluorosulfonic acid) in which water is transported from one interface to another through sulfonic acid channels. An important aspect of this is that the rate at which water binds as water-of-hydration and the rate at which water is transported within is closely tied to the degree of hydration of the membrane itself,3, 4, 11, 12 and thus the partial pressure of water vapor at each interface. Several investigators have studied the dependency of water transport proper- ties on the degree of hydration and have developed relationships for the diffusion coef- ficient and adsorption isotherm based on the partial pressure of water present within the membrane.3,4,11,12 Springer et al.6 measure water diffusion coefficients, water adsorption isotherms, and membrane conductivities in order to develop an isother- mal, one-dimensional, steady-state model for a complete PEFC using a Nafion⃝R membrane, and successfully verified some of their model’s predictions experimentally. 74PDF Image | TEMPERATURE SWING ADSORPTION COMPRESSION AND MEMBRANE SEPARATIONS
PDF Search Title:
TEMPERATURE SWING ADSORPTION COMPRESSION AND MEMBRANE SEPARATIONSOriginal File Name Searched:
temp-swing-adsorption.pdfDIY PDF Search: Google It | Yahoo | Bing
CO2 Organic Rankine Cycle Experimenter Platform The supercritical CO2 phase change system is both a heat pump and organic rankine cycle which can be used for those purposes and as a supercritical extractor for advanced subcritical and supercritical extraction technology. Uses include producing nanoparticles, precious metal CO2 extraction, lithium battery recycling, and other applications... More Info
Heat Pumps CO2 ORC Heat Pump System Platform More Info
CONTACT TEL: 608-238-6001 Email: greg@infinityturbine.com (Standard Web Page)