Permeation sorption

Hernandez, R. J., Giacin, J. R. 1997. Factors Affecting Permeation, Sorption, and Migration in Package-Product Systems chapter 10 in Food Storage Stability. Taub, I. A., Singh, R. P. (eds). CRC Press, Boca Raton. 

Most separators tend to be operated over a relatively narrow range of temperatures however, a wide range of feed pressures and compositions can be encountered. Therefore, it is appropriate lo cousider in more detail the pressure or concentration dependence of the permeation, sorption, and diffusion coefficients that control module operation,... 

Almenar, E. and Auras, R., Permeation, Sorption, and Diffusion in Poly(lactic acid). Chapter 12 in Auras, R., Lim, L., Selke, S., and Tsuji, H., Eds., Poly(lactic acid) Synthesis, Structures, Properties, Processing, and Applications, Wiley, New Jersey (2010) pp. 155-179... 

In PV, the amorphous region alone is responsible for sorption/permeation. Sorption causes increase in free volume and facilitates diffusion. 

Table 17.6 Overall permeation, sorption and diffusion selectivity for cation exchanged membranes ...

NUMERICAL SOLUTION OF THE PERMEATION, SORPTION, AND DESORPTION RATE CURVES INCORPORATING THE DUAL-MODE SORPTION AND TRANSPORT MODEL... 

Numerical solutions were applied to the dual-mode sorption and transport model for gas permeation, sorption, and desorption rate curves allowing for mobility of the Langmuir component. Satisfactory agreement is obtained between integral diffusion coefficient from sorption and desorption rate curves and apparent diffusion coefficient from permeation rate curves (time-lag method). These rate curves were also compared to the curves predicted by Fickian-type diffusion equations. 

Numerical Solution of the Permeation, Sorption, and Desorption Rate Cun/es 69... 

The diffusion coefficients determined in the conventional manner also were substituted into the analytical solutions of the purely Fickian diffusion equations for permeation, sorption and desorption into flat membrane [8]. 

Figure 6 shows the pressure dependence of diffusion coefficients calculated from permeation, sorption, and desorption rate curves for CO2 in PI2080. The average values of diffusion coefficients from sorption and desorption rate curves D y are in fair agreement with that from permeation rate curve D. The solid line in Figure 6 was computed from Equation 14... 

Figure 6. Pressure dependence of diffusion coefficients calcuiated from permeation ( -), sorption ((,)) and desorption (A) rate curves for CO2 in PI2080. 9 is average vaiue of diffusion coefficients from sorption and desorption rate curves at same pressure. The soiid iine is caicuiated from Equation 14 using parameters 0 in Tabie 1. The dotted line is calculated from Equation 15 using parameters in Table 1.

RJ. Hernandez and J.R. Giacin, in Factors Affecting Permeation, Sorption, and Migration Processes in Package-Product Systems (LA. Taub and R.P. Singh, eds.). Food Storage Stability, CRC Press LLC, Boca Raton, FL, 1997. 

Hernandez, R.J. and Giacin, J.R. (1998). Factors affecting permeation, sorption, and migration processes in package-product systems. In Taub, T. and Singh R. (eds). Food Storage and Distribution. CRC Press, Boca Raton, FL, Chapter 10. 

PERMEATION, SORPTION, AND DIFFUSION IN POLY(LACTIC ACID)... 

Several recent studies report gas permeation, sorption, and free volume characteristics of these two amorphous fluoropolymers. Nemser and Roman (1991 Nemser, 1993) reported permeability properties of Teflon AF polymer membranes prepared by a melt-press method. Similar to PTMSP, these polymers are permeable to permanent gases. For example, oxygen... 

---