prelim_pract1_solns - _ . . Ike following problems are...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 2
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 4
Background image of page 5
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: _ . . Ike following problems are fiom previous exams in this class. We will work them out during recitation today and show solutions. These problems do not have to be handed in. Problem 1 {suggested time: 15 minutes} A liquid mixture containing 30.0 mol% benzene (B). 25.0% mol% toluane (T). and the balance xylene (X) is fed to a distillation column. The bottoms product contains 96.0% X and no B, and 95.0% of the X in the feed is recovered in this stream. The overhead product is fed to a second column. The overhead product from the second column contains 97.0% of the B in the feed to this column. The composition of this stream is 94.0 mol% B and the balance T. A) Fill in the missing arrows and label (including units) knowns and unknowns in the flowchart below. Be sure to use the minimum number of unknowns in labeling your flowchart (based on the information above). H1 mot/la 3‘11; moi/l. 1,30 mom Column 1 X32 mo: 8 in”: Column 2 n _ 9.4 m“ g/mel. _.._.-.—)- 371. ml The“ 0.06 Mot T/mm‘ 0.300 mol Eltmol 0.250 mol Ttmol ’"x€a“l‘rz "M “M” 0.450 mol Xtmol Minot/g. fl;- Mol {h 0.0% luv-'T'hunl V Ass- ml 5/M0l 0% met Mme] X75 M°i T/mel . has. xfi mot xtmnl B) Do a degree offieeclom analysis ofthis problem to prove that for an assumed basis of calculation, molar flow rates and compositicms of all process streams can be calculated from the given information. (Hint: do an analysis of column 1 first. Then do an analysis of column 2 based on column 1). Column 1 Column 2. 4- H’LWJ (LL: “'5! x81. , KT}. Afarlfimws m“ ns‘ X'gf KT:- “3 Ewimurl (no Kg”) '— animag (Hofxm) _ l Specificaan (iSZWoFx} -— i SP“ (figmenn) .—._._, 0:1‘iDF C) Write down in order, the equations you would solve to calculate unknown process variables. For each equation, 0t: pair of simultaneous equations, circle the variable for which you would solve, Do not do the calculations. (Hint: start with equation with fewest unknowns.) Cblumn } a7 972Wvfig 0.97xfl1n1203m, a) «(21' H1 *3 n“; + @145- EngrD 219 - Prelim l Initials 2. 40 int5' este ‘ e'30 minute The following two reactions occur simultaneously: FcS: + 3-0, —I> FeO(J} +280,(g) Reactionl ll .52. 21-TeS2 + 30, -> Fe,OJ{s) + 4SO,(g} ReacfionZ The product gas (flue gas) consists of 10.2 mol% 50;, 7.8 mol% 0;, and 82.0 mol% Hg. The feed is PBS; and air. (3) Draw a proper flow chart for this process. Take as a basis 100 mol of prfluct gfi. LAKE? Emu: ’ and 24%.“ 194-2! mot»:st WIIJM w mom Q {Auk WW. Fes (coma! 0;,”an 2' meme. ) n01 ml 02_ 101?. w! 25oz loam/$01 £'°”°"‘3' “3 £1.0m3/N1. "him; 1:910 {53 O [S "5103!"?! a: 3 J (b) Defining extents of reaction {1 and £2, write formulas in terms of The extents of reaction for the number of moles of each component in the product gas. EngrD 219 — Prelim l Initials (c) Find the extents of reaction. 6J4: hm Hal)" ilk 6nd Lek/5L.- fi~l30 : Home : ($991: 21.3mmoz fo+9£2=im2 =3) f,=S.!—Q£L 2-3-9 "$725; "ff/251519 ) i__ ________,_,_____——-u “S72 (S‘.I—Q£1,)-'H/1(§1‘ "'5‘ -:'2.75.+.S-;L -”4.£1.= in; —’4 £1, = 4.35" I! €z: lug-mob} ? {.1‘ IKE-S) = ’OJMOL’IJ ——____. a"; H (d) How many moles ofFeS: reacted by reaction 1 and how many moles of RS; reacted by reaction 2‘? nFefq. = nch,» _ 15’ _ 262‘ 1‘ f 0.1 l" more “HM rum nm 1 ’2. EngTD 219 — Prelim 1 Initials (e) Use atomic balances to find the number of moles of FeO and F8203 formed. You can do this even ifyou are unsure of your answer to part (c). Otherwise, show your results are consistent with your answers to parts (c). *1. 5:57. .9 I" ‘ __ _"___) imam: In}, 1.1M!!! 01, 2!: I" 01. “mo! N1. #1., WIN-1. H-L Me}. Fca “'3 #11, Mo! Pa 93“) Fe: n1: I01, + 7-10: 0-. 2n”) = n; 4 3n; + 2H“) 4- 2mg) 5 2.14; a “7 Z ...
View Full Document

This note was uploaded on 02/13/2008 for the course CHEM 3890 taught by Professor Hines, m during the Fall '08 term at Cornell University (Engineering School).

Page1 / 5

prelim_pract1_solns - _ . . Ike following problems are...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online