(a) Use the data in Tables 21.8 and 21.9 to calculate the relative volatility of the N₂-O₂ system for different compositions at 65 lb_ƒ/in.² gauge pressure. 

(b) How close to an ideal system is this? 

(c) Neglecting the effect of trace gases, what is the minimum number of ideal plates required to separate air into products of 99 percent purity?

Tables 21.8:

Tables 21.9:

Transcribed Image Text:

TABLE 21.8 Enthalpy of oxygen-nitrogen at 65 lb,/in. gauge Liquid Temperature, C -163 -165 -167 -169 -171 -173 -175 -177 -178 N₂, wt% 0.0 7.5 17.0 27.5 39.0 52.5 68.5 88.0 100.0 H, cal/g mol 420 418 415 410 398 378 349 300 263 N₂, wt% 0.0 19.3 35.9 50.0 63.0 75.0 86.0 95.5 100.0 Vapor H,, cal/g mol 1,840 1,755 1,685 1,625 1.570 1.515 1.465 1425