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F2007_HW11Solt - 2 You are interested in leaching caffeine...

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Unformatted text preview: 2. You are interested in leaching caffeine from coffee beans using supercriticat CO; with surfactants as a solvent. The beans are fed dry but after extraction contain 0.4 kg solvent pezr kg dry beans. Ail the caffeine dissolves in the solvent. a. If you add 4 kg pure solvent per kg dry beans to a stirred tank, what fraction of the caffeine is extracted? b. If you use cross—flow in two stages (INSTEAD of counter—current flow), each fed with 2 kg solvent, what is the fraction extracted? 0. If you use two countermcurrent stages fed with 8 kg soivent, what is the fraction extracted? 6L) Basis‘ WSW’W‘L ' S 3‘!” {QM-7L 4 L5 3,,le W “rt—SW“; 0‘4 LES ‘ C J . I .. F's-\tw t + 3:31; imam?“ (O«4%33X&)[email protected])3?.Eljx,*o.4Ljscf1351K! (Larisa—'1‘ 'gg’xf :- 8 {X1 #4,”le “5,053C xi 3 m = H 0.4%.), . canaouc) —-———~—- «a . BI 69 a l— c. ' I“ c "WKG fatt-‘t 2. in order to dehydrate organic solvent, water is adsorbed onto 4 A moiecular sieves. You expect a Langmuir isotherm of q = {0.26 (cm3 H20)! cm3)*y],l [710 ppm + y]. From the pilot scale data shown below, a. What are the breakthrough (t3) and exhaustion times (t5)? b. What is the maximum binding capacity (do) and affinity (K) ofthe molecuiar sieves for water? c. Your pilot scale data (below) was obtained using a 25 cm iong column. What is the length of unused bed (LUB) in this column? d. If the feed contains 1440 ppm water and you need to dry 580 m3 of solvent per day to a final concentration of 20 ppm, how much resin will you need to operate in batch? (i.e., a single stirred tank at equiiibrium) e. (Next time we will worry about scaiing up the packed bed.) Time “Tm” 9 "" “T6” 10.6 11 " ” 12 32.5 m (hi) . M . . W .LLBEEDZWEWWWWEWWWWMEO -498 “mmwflmm 1440....m. m 160 34639 fidaaiixj’ flaunt»th “flea 481 '3’ [577-30) 0d“ fisflfi-S'mf 0—) L159“ [3 + efmam Iowa WW 6% W 6% 13:3 , 4+6 g W 4130(éf-+g)1 rpm—p“ ’ i an1 2 ‘ \f 6 900%) 10 (J 6 T‘g-HC 1312 ‘ . . M8 9 as an»- 00 BATOH .’ mm WM‘ Wm'i'év— 3R) 1."; Maxi)” EN“ ‘1; Max?“ Tia % _ 3 Wfifix “0 ' 530 “3 ({44ax :04” 9‘ H29) m 0.835w-3gfio L0 ‘ 3' :) aonlg W3 “7-0 m L—m a W— 4” 510;”me axon - ) «3 ea; . x .WQ w s M “.2: to'lb<;ow ‘ J23" g flak HS ‘ QT) / U Jaw? > ék‘ (?Io+ 95")?» 30$: , *4 COM. #12 “LO 5m $150? VCSM n, / A (6%”? amm “2,0 MW 41: Night ’- War m-wg,a ma“ 2 6335 -« .w/é s .8615 a W34 : LO —: itOMFSm-aw , 8.3.1:?) M3} 0/ 1410 cake, m. m9»... W "MM q.flkf63 W3 ifiO/WHMA “ (w .9 2. Identify the type of isotherm (Einear, Langmuir, Freundlich) associated with the data shown below. If Langmuir or Frendlich, identimflemggnfitants. m WWWJE ____ __2_-3 4 m WEE-2 u N @442. “gm... 5£M$WMWW§2§5W 32 “Y m 0 5 m__L2___2_2_W248_Lm§5_:WéWW mummy“ 2 6 6 8 7 Summjmiw 23m 29 32 “my Ex 1 _ LINEAR 5-.5 Ex 2 - v-m LANGMUIR mm 7. 6 00 m 41; K ~44 Ex 1 Ex 2 v 2 5.2:71x + 0.0444 y = 41.451Ln(x) 4 41.604 35 039mm 35 03.10917 30 30 I E 25 E 25 i U) U] E E .2. 20 m 20 E E 3 15 ' 75 15 E E v 10 v 10 C!" U 5 5 0 0 0 2 4 6 8 0 2 4 6 a y (mg/ mt fiquid) . y {mg/ ml liquid) 1. You are performing a concentrated extraction process with 150 kg/hr feed containing 70% water and 30% acetone The feed is being washed counter—currently with 50 kg/hr pure methyl—isobutyl ketone (MIK). If you need to recover 98% of the acetone from the feed, how many equilibrium stages are required? Hint: first find the concentration in the retentate if you remove 98% of feed acetone. Equilibrium graph attached as separate file under HW 11. E- é— HSJ [co/l Maid. r a "a a {gobs/*6“ 304. to $07. \f . ~ [34—3 1: iSQLj/LA/BO’Z/l’t w ' WV 3 / iL <06 {M} 1597 ha; AW M 0;»? wlk H: 1a 5’? 9-C— 52 £32 1420 Fifi Vila: E‘ 42.57. he, :07. R10 4157, wick Pio‘t ———«::a N :o—U QJ‘ w “it” M) M Lard M {'0 M2. 56) ...
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