By Bélafi-Bakó Katalin (auth.), Katalin Bélafi-Bakó, László Gubicza, Marcel Mulder (eds.)
Proceedings of the eu Membrane Society XVI Annual summer time institution on Integration of Membrane procedures into Bioconversions, held August 22-27, 1999, in Veszprém, Hungary.
the aim of this ebook is to provide an outline of the present scenario of membrane separation tactics within the box of bioengineering and likewise to explain how their joint software probabilities can be utilized in either laboratory and commercial scale purposes. In advertisement purposes, concentration is headquartered at the fields of meals undefined, chemical/fine chemical undefined, and environmental safeguard.
many of the ecu specialists within the interdisciplinary fields of membrane methods and bioconversions have contributed to the chapters during this paintings, making it the main updated quantity presently available.
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Bar 0,1 0,01 0 0,8 1,6 2,4 3,2 ( 1ITi Figure 12. Solubility of gases and vapours in PDMS as a function of the square root of the reciprocal reduced temperature9 Table 1. Permeabilities of gases and vapours in PDMS at 40 °C Component nitrogen oxygen methane carbon dioxide water ethanol methylene chloride trichloroethylene toluene # I Barrer = 10. 10 em3 (STP) . cmlcm2 • s . crnHg Permeability (Barrer)# 280 600 940 3200 22700 45000 193000 740000 1106000 Fundamentals of GS, VP and PV 51 Due to the high solubility coefficients high permeability coefficients are obtained as can be seen in Tab.
Gra (19) C s concentration of solute s in the membrane (mol/cm3) Us substrate linear velocity (cm/s) v s partial molar volume (cm3Imol) The volume flow results from integration of (20) A - is a so called membrane constant (cm3 cm02 sol), comparable to Lpin equation 17. The transport of the salt diffusion: IS pressure independent. It occurs only by Js = B 11 Cs (21) B - is a constant (cm/s) = K Dm//1x with K as the partition coefficient. The influence of concentration upon volume flow can be seen from Fig.
Staude, Eberhard 28 Figure 4. 3 Hydrodynamic state l. Laminar flow. This flow pattern is, in no way, desired, but found in plate and frame modules, as well as in those with narrow channels. The mass transfer coefficient can be derived from the following general relationship2. 66 ( S _u_ ) d L (11) h Especially for plate and frame modules, the substitution of the channel height 2 a for the equivalent hydraulic diameter dh yields 29 What makes filtration with membranes so fascinating? 816 D S O. 33 L ln~ (14) cb From this equation, the influence of the concentration polarisation obvious.