Lecture24 - ChE 210: Meeting 24 March 11, 2011 Outline...

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Unformatted text preview: ChE 210: Meeting 24 March 11, 2011 Outline (F&R Chapters 1-6) Homework Due Friday 03/25/2011 - Project Assignments 4.61 a-c, 4.78, 6.59, 6.78, 7.1, 7.4, - Review Problems 7.11, 7.14 Project Assignment Felder and Rousseau, Chapter 14: The Use of Limestone Slurry Scrubbing to Remove Sulfur Dioxide from Power Plant Flue Gases This project consists of a series of assigned tasks that are to be compiled into a complete portfolio. On each due date, an updated portfolio containing the assigned tasks and all previously assigned tasks must be submitted at the beginning of class. Late assignments will be accepted, however, 10% will be deducted for each day that the assignment is late. On each due date, corrections from the previous assignment may be submitted for 50% credit. Only corrections from the assignment immediately prior to the due date will receive credit. A summary of the assigned tasks and due dates is in the table below, and a complete description of the assigned tasks and grading scheme follow. Assigned Tasks Due Date 03/28/20 1 1 04/06/20 1 1 04/15/20 1 1 04/22/20 1 1 04/29/20 1 1 Process Flow Diagram, Table of Variables Problems 14.3, 14.4, 14.5, 14.6 Problems 14.7, 14.8, 14.9, 14.11 Problems 14.12, 14.13, 14.14, 14.16, 14.19 Complete Portfolio 1/9 ChE 210: Meeting 24 March 11,2011 Description of Assignment Components Process Flow Diagram: Draw the process flow diagram from the process description provided in the problem statement. Clearly label each process unit and provide a distinct label for each process stream. Include all given flow rates, compositions, temperatures and pressures given in the problem statement. Table of Variables: Construct a table of process variables with mass and molar component flow rates, temperature and pressure as the column headings, and stream labels as the rows. Fill in the table with all of the given flow rates, temperatures and pressures. Cross out the flow rates of components that do not exist in a particular stream. Problems 14.13, 14.14 and 14.19: These problems must be answered in paragraph format with any necessary calculations included as an appendix. The answers must be typed. Complete Portfolio: The complete portfolio will include the process flow diagram, table of variables, and solutions to the assigned problems. The complete portfolio must be submitted in a folder or small three- ring binder with a title page. Further requirements and expectations are outlined below. 2/9 ChE 210: Meeting 24 March 11, 2011 Grading/Requirements and Expectations Process Flow Diagram Neatly drawn in ink or computer generated, all process units and streams distinctly labeled, all relevant variables included with values and units when known Neatly drawn in ink or computer generated, columns and rows clearly labeled with variables and units, all known values included in the appropriate units Calculations are accurate, calculation procedure is clear and easy to follow, units are carried throughout all intermediate calculations (for repetitive calculations on several stream variables, one sample calculation with all units shown is sufficient). The problem number is written at the top of the page. Flowcharts for subsystems (hand drawn in ink or electronic) and degree of freedom calculations are included when relevant. All variables used in the calculations are consistent with the flowchart variables. Calculations are neat and organized. Hand written calculations are submitted on one style of 8.5" x 11" looseleaf or engineering paper. Calculations performed with a spreadsheet have clearly labeled rows and columns, with a key for formulas used in each cell. Answers obtained by both handwritten and spreadsheet calculations contain the appropriate number of significant figures. The final answer(s) have the appropriate units, are boxed and easy to find on the pa . Table of Variables Assigned Problems 3/9 ChE 210: Meeting 24 March 11, 2011 Completed All pages are submitted in order in a - Portfolio folder or three-ring binder with a cover page. All work is professional in a - earance. Project All project deadlines are met. Portfolio 10 Management contains the required elements at each deadHne. _ - _ - _- 4/9 ChE 210: Meeting 24 March 11, 2011 Separation Units . = nA,1 = 100 moi/h , VA,6: r281 _ 5 moi/h Reactor YB” = 1 ’ T x 100 c 4 P=1am n03 = 150 moi/h Filter 1 Filter 2 Filter 3 Holding Tank Extraction Stripping Column 5/9 ChE 210: Meeting 24 March 11, 2011 53mm Mass Flow Rate (kg/ h) __-_ __- “___-_ _—-_ _——_- _—-_ “__-_ __— 6/9 ChE 210: Meeting 24 March 11, 2011 Review Problem 1 Methane (CZH4, M) is reacted with water (H20, W) to form ethanol (CzH5OH, E). In an undesired side reaction, E decomposes to form diethyl ether ((CZH5)ZO, D) and water (H20, W). The product stream from the reactor is sent to a condenser, which removes all of the W and E as a liquid stream. The vapor stream, which contains only M, and D, is split and 55% of the vapor is recycled to the reactor. The selectivity of E relative to D exiting the reactor is 20 mol E11 mol D, the single pass conversion of M is 15% and the overall conversion of M is 90%. This process is diagrammed below. CZH4 + H20 9 CzH5OH (M) (W) (E) 2C2H50H —> (czH5)zo + H20 (E) (D) (W) ch= VMRC= . vaRc = nVout= YERC= YMan= YDRC= VDVmu= VOut Condenser T=50C P=1am In ann =10 kmol/h nMRIn = nW,ln = nW,Rln = nE,Rln = nD,Rln = nD,RQut = 7M ChE 210: Meeting 24 ’Pmce s 608 0.55nv -' ngc Seled’ivi’nj .- 010 m1 E 1‘; «out \ mol 9 ‘ “9.11M angle pass CorNErsuvq - ('1 ' anm.” nm.K°0“’ ‘ O .‘5 “(mam Overcw Conversflon: . Mun‘ \‘Imfloui- “wed g o_qo 5min Overau "1 unknmnns ( r'\ h ' V0.1“ V001 quOO} (\L quL- l'IEJ.) + a 4‘3 " '-\ onon bodancns Lm,w‘g.b) \ pmc Spec (overcm WV ) -02 (JhLLS Con m 62.009? Ready 8 (hmmM‘ nw‘l‘n 052001- “DM) ’6 6L ’5‘ March 11,2011 . (be spec ‘ leolwdw balanastmweb) 31’ ‘ A firm: spec (send, smgtepasscmfl -(> phqs cg; .. 0 pm; can W * o PMs mu) 3 be? F M H Bu? 3? Lo unmnflfimud‘r 0”” “52“” “M” “if “MW V“! “z. Hm. Hm.) No mlso - q molewmxmjamzs(mmeb1 ’ 0 pm Spec ' 0 P‘Nbcon “ C) phyla \OuD J (obi? 8/9 Exi'ctfl BO-W‘CCS overall: m: 6mm ‘ Hmwuifivwi ' gt : 0 U0" nw‘dw " Haunt. “’ é: " £2. ’0 E: “ ‘15...r'xl_ 4- §. aggz = 0 D: u ‘ibmoui fivwx * g; = o U)‘ .. ‘ nwsam “unto-4% ‘ é: + £2 c’ o E1 n ~ A 5.2m e'JLmfi * g. " 6252 = 0 D '. n Cm‘k‘fia ' m: “Imam” " \lmdnv : o . . ' .. ‘ :0 ovum": C" 7-“m.’«: ‘ Z‘immmnvm ‘q‘fbwwnvw‘ 6H6.th H‘- Llfxmm 'i' .9. hwéo ’ q‘lmwufi {WM " ‘OVD.VNH.NI>0’¢ " a‘iW‘vhdL. bqe'bnh =0 0 z . . Iii " \1 . ‘ I" fi ‘ - \1 D‘vod‘t voo’: unLnl \{Efl- L 2 O = C . ‘ . + a . ‘ h l'I. - L1H *afi - h + (OHS -(a + H)“ ' o (m 1‘0!” .u) ' "I I“ f, a I; . ‘ n In {43.10% salt) E “0‘. 5,2“! ‘ ‘lh “ fining} =Q ChE 210: Meeting 24 March 11, 2011 Review Problem 2 The liquid stream recovered from the process described in Review Problem 1 is sent to an evaporator to separate the ethanol and water. The evaporator operates at T = 85 C and P = 1 atm. **Note: this is actually a poor example because water and ethanol form an azeotrope and cannot be separated by this process, but you’ll learn all about that in ChE 358** nv = Yw,v = YE v = Evaporator T = 85 C RODUJiS L010: Pm : LIN‘VP = qw‘L (863(1) :. F1 .. %C 2 wt \lwtln din a HWN “v " K-{mnf‘L : Q Lied“ nu‘ HelV nV — Heathz O 9/9 ...
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This note was uploaded on 07/31/2011 for the course CHEM E 210 taught by Professor Shanks during the Spring '02 term at Iowa State.

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Lecture24 - ChE 210: Meeting 24 March 11, 2011 Outline...

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