Outlet concentration profile

Fig. 12. Outlet concentration profiles from a batch chromatographic bioreactor for enzyme catalyzed esterification. Water, which when in the liquid phase irreversibly inhibits the reaction, is adsorbed. The profiles of water (open circle), propionic acid (filled square), isoamyl alcohol (filled triangle) and isoamyl propionate (open square) at the reactor outlet are presented. (Reprinted with permission from [178])...

The CO outlet concentration profiles of these samples at this time were also determined (Figure-2b). Although these profiles are similar to the CO profiles (Figure-2a), a slight difference was found on Na-X. In the case of Na-X, because the outlet concentration of CO was 8500 ppm (the effluent ratio 8.5%) at an inlet gas flow rate of 1500 mL N/batch, CO could not be detected this result strongly suggested that Na-X could adsorb CO selectively, compared with CO. 

In theory, we could generate several moment equations and solve for an equivalent number of parameters. In practice, it is best to only use the first and second moments. The outlet concentration profile usually has some tailing at longer times. These values usually have the largest error in their values and can skew the calculated moment values since the concentration is multiplied by t for the fcth moment. 

The static mixer produces an outlet concentration profile nearly as sharp as a step-change input in a plug-flow device. 

Superficially, the outlet concentration profile in Figure 18-17C looks like the result from a linear isotherm (concentration jumps to Cfggjj). However, for the linear isotherm this outlet step occurs att = L7Us, which is constant regardless of the feed and initial concentrations. The shockwave outlet step occurs at t = L/Ugh,... 

Figure 18-18. Analysis and results forExanyle 18-7 (A) solute movement diagram showing intersection of two shock waves, (B) outlet concentration profile...

Use the Lapidus and Amundson solution plus superposition to determine the outlet concentration profiles for linear adsorption and chromatography problems... 

Predict the outlet concentration profile. Specifically, find when the following concentrations exit y = 0.0010, 0.00075, 0.0005, 0.00025 and 0.00000. Sketch the outlet concentration profile (y vs. t) and label the times when these concentrations exit the column. Watch your units. 

Since the flow pattern and the inlet and outlet concentration profiles are symmetrical about the axis,... 

Figure 18.5b shows the results of one experiment performed at 250 °C by feeding and removing the NH3 feed flow every 300 s for NO2/NOX = 0.25 feed ratio the figure compares the measured (thin lines) and simulated (thick lines) outlet concentration profiles of NH3, NO and NO2 during such tests [6]. It can be noticed that a clear maximum in the DeNOx activity was still present at NH3 feed as already observed on the powdered catalyst. Notably, the simulation obtained by the dual site kinetic model showed the same qualitative behavior. 

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