Desorption rate curves

Fig. 5. Effect of the initial populations hm on a normalized desorption rate curve [criterion of resolution employed after Carter (32)]. Hyperbolic heating schedule, 0 = 1.073 X 10-< deg-1 sec-1 Ea = 40 kcal mole-1 x = 1 Tm = 670°K A7 m = 15°K. Curves 1, 2, 3, correspond to naa/nm = 1.00, 1.54, 1.85, respectively.

At the end of data processing, Qj, Qj, Qj and Q the total value can query and display at any time. Cumulative desorption rate desorption rate curve changes over time can query and display (Zhang Yanwen 1998). 

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

MATHEMATICAL MODEL, 68 Calculation of Permeation Rate Curve, 69 Calculation of Sorption and Desorption Rate Curves, 70... 

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 Curves 71 For desorption,... 

For sorption/desorption rate curves, a good estimation of integral diffusion coefficient can be obtained by taking the average of the diffusion coefficients calculated from first slope for the integral sorption (DJ and desorption (D ) cycle, [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.

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