Elementary Principles 210

# Elementary Principles 210 - 6.62 (cont'd) S,EB = p* 109.95...

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6- 44 6.62 (cont’d) S,EB B,EB ** * * 109.95 881.59 0.725 , 5.812 151.69 151.69 S B EB EB p p pp αα == = = Styrene ethylbenzene is the more difficult pair to separate by distillation because is closer to 1 than is S,EB B,EB . c. α ij ii jj yy xx ij i ij i ij i yx y x x ji −− ⇒= +− =− 1 1 11 () bg di d. BEB , . = 5810 y x x x x Pxp xp B BB E B B B B B E B = = + =+ , , . . 581 14 8 1 1 , x y P Bl Bv B B 00 02 04 06 08 10 00 0592 0795 0897 0959 152 298 444 5900 736 882 .. . . . . . . mol mol mol mol mmHg 6.63 a. Since benzene is more volatile, the fraction of benzene will increase moving up the column . For ideal stages, the temperature of each stage corresponds to the bubble point temperature of the liquid. Since the fraction of benzene (the more volatile species) increases moving up the column, the temperature will decrease moving up the column . b. Stage 1: mol / h, mol / h lv ±± nn = = 150 200 ; x 1 055 045 = mol B mol mol S mol ; y 0 065 035 =⇒ mol B mol mol S mol Bubble point : TP xpT = ( ) ( ) 7.06623 1507.434/( 214.985) 1 E-Z Solve o 1 6.89272 1203.531/( 219.888) (0.400 760) mmHg 0.55 10 0.45 10
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