(a) Use the correlation in Fig. 25.4 to predict the amount of n-butanol adsorbed on carbon for the conditions of Example 25.2, and compare with the experimental data. 

(b) Estimate the saturation capacity of the carbon for a butanol concentration of 20 ppm in air at 30°C and 1 atm.

Fig. 25.4

Example 25.2

The adsorption of n-butanol from air was studied in a small fixed bed (10.16-cm diameter) with 300 and 600 g carbon, corresponding to bed lengths of 8 and 16 cm. 

(a) From the following data for effluent concentration, estimate the saturation capacity of the carbon and the fraction of the bed used at c/c_n-0.05. 

(b) Predict the break-point time for a bed length of 32 cm.

Data for n-butanol on Columbia JXC 4/6 carbon are as follows:

Transcribed Image Text:

Volume adsorbed, cm³ lig/100 g 100 50 20 10 S 2 0 5 n-paraffins C₂ to Co C₂H₂ CH₂CH₂ 10 15 T/V logiclf/f) H₂S, CS₂, mercaptons C₂HCl₂, C₂C C₂H₂Cl 20 FIGURE 25.4 Generalized adsorption correlation 1.2 for Calgon BPL carbon (1,040 m²/g) G