Oxygen breakthrough curves

Figure 10. Comparison of experimental (open circles) and model-predicted (solid line) oxygen breakthrough curves.

Figure 5. Experimental oxygen breakthrough curve. Product purge during desorption step.

Fig. 6. Predicted oxygen breakthrough curves. ---------Purge------------No purge.

The predictions of the theoretical model have been compared with the experimental results. Oxygen concentration breakthrough curves were measured experimentally by sending to an oxygen analyzer a small fraction of the product gas produced at the exit of the bed. The oxygen analyzer response was about 1 sec, and readings were taken every second. There is a period when the unit is not producing, namely between the end of the production step in one bed, and the end of the pressurization step in the other bed. The experimental results are... 

De-Xin, Z. Zhi-Jing, X., and Zhen, F., Prediction of breakthrough curves of oxygen-nitrogen coadsorption system on molecular sieves. Gas Sep. Purif., 2(4), 184-189 (1988). 

Figures 6.5a and b plot the thermodynamic state of the 200 x 1400 LAD screen at bubble breakthrough based on the pressure at the liquid side of the LAD screen and the temperature at the liquid side of the screen and in the bulk liquid, respectively. Similarly, Figures 6.6a and b plot the same test conditions for the 325 x 2300 screen. The saturation curve for oxygen is plotted for reference.

Coke furnace wastewater containing dissolved organic carbon (DOC) of 69 ppm and two peaks at the molecular weight of 400 and 10,000 Da was subjected to the filtration by the activated carbon membrane. Figure 9.20 displays (permeate concentration in chemical oxygen demand (COD)/feed concentration in COD=C/Co) versus effluent volume. Each curve indicates the typical breakthrough cirrve but interestingly the curve never exceeds (C/Co) ratio of 0.68, which means 32% of the COD is removed by the sieve mechanism. Hence, the COD removal by the... 

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