Chemistry and Technology of Explosives: by Tadeusz Urbanski
By Tadeusz Urbanski
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In rubbery polymers, on the other hand, the two effects are more balanced. For molecular weights up to 100, permeability generally increases with increasing molecular weight because pisat is the dominant term. Above molecular weight 100, the molecular weight term gradually becomes dominant, and permeabilities fall with increasing molecular weight of the permeant. 11. 11 Permeability coefﬁcient, PiG , of n-alkanes in poly(dimethylsiloxane) as a function of saturation pressure (pisat ) is larger than the effect of increasing size or Di .
80), the Henry’s law coefﬁcient Hi has the units atm · cm3 /g. More commonly, Henry’s law is written in terms of mole fraction: Hi · nLi = pi where Hi has the units atm/mol fraction. 13 The effect of permeate pressure on the water ﬂux through a silicone rubber pervaporation membrane. 14. 79). The ﬂux decreases with increasing permeate pressure, reaching a minimum value when the permeate pressure equals the saturation vapor pressure of the feed. 14(a) shows that the permeability coefﬁcient decreases with G decreasing permeate pressure, that is, Phexane decreases as hexane concentration in the membrane decreases.
74) where the superscripts L and G represent the liquid and the gas phases. 77) This expression links the concentration of component i in the liquid phase, ciL with pi , the partial vapor pressure of i in equilibrium with the liquid. 78) where pio and pi are the partial vapor pressures of component i on either side of the membrane. 79) This equation explicitly expresses the driving force in pervaporation as the vapor pressure difference across the membrane, a form of the pervaporation process 42 MEMBRANE TECHNOLOGY AND APPLICATIONS derived ﬁrst by Kataoka et al.