Elementary Principles 159 - 5.70 (cont'd) c. 143 kmol N 2 ....

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5- 47 5.70 (cont’d) c. N at 700 kPa gauge = 7.91 atm abs. P T =======> z = 0.99 2r r Fig 5.4-2 ⇒= = 0236 236 ., . n PV zRT atm 0.99 L 0.08206 .2 K kmol y yn 1.634 y 1.634 y n yy n n= ln y y ln n 1.634 Need at least 5 stages Total N kmol N kg / kmol 2 2 Latm mol K 1 init init 2 1i n i t init init ni n i t init n n init init 22 2 == = = F H G I K J = = F H G I K J F H G I K J F H G I K J =⇒ 791 5000 298 1633 0210204 1634 0026 0 0033 48 5 143 28 0 200 kg N 2 . . .. . . . . . . bg b g d. Multiple cycles use less N 2 and require lower operating pressures. The disadvantage is that it takes longer. 5.71 a. ± ± ± ± ./ ± . ± m=MW PV RT Cost ($ / h) = mS = MW SPV RT lb lb - mol 0.7302 SPV T SPV T m ft atm lb-mol R 3 o
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