Download Adsorption engineering by 鈴木, 基之, 1941- 鈴木, 基之, ; Motoyuki Suzuki PDF

By 鈴木, 基之, 1941- 鈴木, 基之, ; Motoyuki Suzuki

ISBN-10: 0444988025

ISBN-13: 9780444988027

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6. Toth equations for different values of r. Fig 3 7 BET plot of gas phase adsorpt~on~sotherm. and approaches saturation limit at high pressures. When the parameter, t, is unity, the above equation is identical to the Langmuir equation. Fig. 6 shows the effect of parameter, I , on the shape of the isotherm. When adsorption takes place in multilayers, adsorption on the adsorbent surface and above the adsorbed molecules is considered to be based on different attractive forces. Monolayer adsorption is formed by the same concept as the Langmuir type adsorption while adsorption above monolayers is equivalent to condensation of the adsorbate molecules, giving rise to the BET (Brunauer, Emmett and Teller, 1938) equation where p, is the relative pressure (=p fp,) and q, represents the amount adsorbed by monomolecular coverage on the surface.

Suzukl, M and K Chlhara, WaferResearch. 22,627 (1988). Suzuk~,T , K. lshlgak~and N. Ayuzawa, Chem. fig. 143 (1985). Karserfan. Kcro f o Ouyou (Acttvated Carbon. FundarnenfaLr and Applrcanons), Kodansha, Tokyo (1975) ( ~ n Japanese) Zeora~to to sono R ~ y o u Henshuu Ilnka~, Zeoraifo f o sono Riyou (Zeolite and rfs Applrcafions), Glhodo, Tokyo (1967) (in Japanese). Adsorption Equilibrium In practical operations, maximum capacity of adsorbent cannot be fully utilized because of mass transfer effects involved in actual fluid-solid contacting processes.

If this Adsorptron Isotherm "1 (a) 5 s 0 A 0 Xenon Ethylene Ethane 49 \ Varrat~onof n w~thchange of D/d from MSC samples 0 Ethane 10 09 20 25 n (-) ( b ) Plots of E/EIdHo versus n for MSC samples Fig. 3 12. Relations among EIAHa n and ratio of pore s ~ z eand molecular d~ameter,D / d (Reproduced w~thpcmusslon by Suzuki. , J Chcm. Japan, 7, 283 (1982)). assumption is valid, then the adsorption equilibrium constant ofthe Henry type equation is related to the constants involved in the D-A equation as Transience occurs at and the fractional amount adsorbed at this point is W /WO= exp [ - ( A / E)"/(n-l)] (3-24) For adsorption of xenon on MSC 5A at room temperature, E, and n given Fig 3 13 Normal distribution curves of carbon C Curve (I) from ~sothermof xenon, Curve (11) from Isotherm of ethylene, Curve (111) from ~sothermof ethane (Reproduced with permisston by Suzuki.

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