PDF Publication Title:
Text from PDF Page: 062
The MTC for a zeolite adsorbent particle typically assumes macropore diffusional resistance as the limiting resistance.2 Under this assumption, equation 3.14 is used to estimate ki either using literature values to estimate Dp, or through a combination of breakthrough and numerical experiments. 3.3.2 Axial Dispersion Axial dispersion acts to disperse the concentration wave in packed column operations, just like mass transfer resistances associated with the particle. At low gas velocity, it is caused by molecular diffusion, while at high gas velocities, it is caused by eddy turbulence. In PSA models, the combined effects of axial dispersion are approximated with the axial dispersion coefficient, DL, often expressed as: 24 where Dm is molecular gas diffusivity, u is interstitial velocity, dp is particle diameter and γ1 and γ2 are constants. The first term is the molecular diffusion contribution to concentration gradient spreading and the second term is the eddy turbulence contribution. The constant γ1 is the inverse of the bed tortuosity factor and 0.7 is a well-accepted estimation for columns of non-adsorbing particles.24 The γ2 constant is the inverse of the limiting Péclet number (Pé∞), which is the value Pé (udp/DL) approaches at high gas velocity. The common estimation of 0.5 comes from the observation that large particles 43PDF Image | LIMITS OF SMALL SCALE PRESSURE SWING ADSORPTION
PDF Search Title:
LIMITS OF SMALL SCALE PRESSURE SWING ADSORPTIONOriginal File Name Searched:
Limits of Small Scale PSA_Aaron Moran.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)