Lecture06 - ChE 210 Meeting 6 Outline(F&R Sections 4.2-4.3 Homework Due Friday Balance Equation 3.15 3.16 3.19 3.32 3.40 3.41 Labeling Process

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Unformatted text preview: ChE 210: Meeting 6 January 24, 2011 Outline (F&R Sections 4.2-4.3) Homework Due Friday 01/28/2011 - Balance Equation 3.15, 3.16, 3.19, 3.32, 3.40, 3.41, - Labeling Process Flow 3.48, 4.4, 4.7a-c, 4.23 Diagrams - Scaling Process Flow Diagrams - Basis of Calculation Example 4.2-2 (Problem—Solving Process) One thousand kilograms per hour of a mixture of benzene (B) and toluene (T) containing 50% benzene by mass is separated by distillation into two fractions. The mass flow rate of benzene in the top stream is 450 kg B/h and that of toluene in the bottom stream is 475 kg T/h. The operation is at steady—state. Write balances on benzene and toluene to calculate the unknown component flow rates in the output streams. 1. Read the entire problem statement. 2. Draw a process flow diagram. 3. Label the diagram with all of the known information. 1/10 ChE 210: Meeting 6 January 24, 2011 WWW = 450 kg/h m T,outT = Out, Top min =1ooo kg/h In XB’in = 0.5 XT,in = 0.5 . Out, Bottom mB,outB = m T’OutB = 475 kg/h 1 ' ‘Ewk‘~ '1“. w r, *deng gem be labeled mm Mod 43mm ((1,463) or _ Compunen-¥ Rum rc- 9i; 4. List all other given Information 5. Identify values to find " H‘mfi; A 2/10 ChE 210: Meeting 6 January 24, 2011 6. Write and simplify the general balance equation for total mass and each species In + Generation — Out — Consumption = Accumulation ‘/ J Total Mass: m , 3 W ~ {my .,. "F‘r‘ - v A i \v.. - l \w ’ - " \.\'v[ i :_ VJ? kiwi!) W w ‘ Benzene: ‘ ‘/ , [xi/Six “‘ 1'?“ 1"“ . sun 51%;.- t "I‘ 1%,. r Tl e: «t ,t Cue“ mg ~ MT ',:Q \AJX l ‘“°5v’<v,.g.f’ 7. Develop a solution strategy - idgn-HR‘ knouns in 8. Solve and check solution l’d. -— "t \t .L ‘ KC, Fig: i ‘93:; ktjlly * n" ‘ "r1 (putt); ‘ \ (1 lY‘i 3' r; 7“ r- l l *1 Ltd 1’s; k ,.)Mw"“+5.!“‘3 “import LN") ’4')?“ \ I 3/10 erbuafims IST ChE 210: Meeting 6 January 24, 2011 Labeling Process Flow Diagrams Typical variable labels for each stream: 1. Total mass flow rate and species mass fractions 2. Mass flow rate of each species 3. Total molar flow rate and species mole fractions 4. Molar flow rate of each species Need all streams to have consistent units. Can combine 1 and 2 or 3 and 4 on a single process flow diagram, but cannot mix mass and molar variables. 4/10 ChE 210: Meeting 6 January 24, 2011 Handout A liquid mixture of benzene and toluene contains 58.0 mole % benzene. This mixture is to be partially evaporated to produce a vapor containing 85.0% benzene by mass and a residual liquid stream containing 10.6% benzene by mass. This process will be carried out continuously, at steady- state, with a feed rate of 1200 moles/h. What are the mass flow rates of the liquid (mL) and vapor (rhv) streams exiting the evaporator in units of kg/h? (Note: You will need to use information from Table 8.1 in Felder and Rousseau) a) Draw and label the process flow diagram. Use consistent units for all of the streams. 5/10 ChE 210: Meeting 6 January 24, 2011 **Need to convert feed stream to mass flow rate and mass fraction** "'1 \o KO v- v v ' i ‘:;4L%fgwambww*mam mm goo-Ce) " Q : 93341316 : . Q . 581;; y '1 RCC‘W‘M in Tolkmfi 1 0‘4 \ c 2 xx \ . fib\_\3&>bmo\\ 13~\~1j N m : «LN/1‘14 {Lng h "9 (Y‘s T “W h (MM “9003 J ' H 5“ 553st; J? \‘BTC * ‘ . {ii—u Li R, a. i h Nam : -7~~ ‘ \ ‘ v .-.- O. "' a ELM» ‘—\ H: (5/ ‘ “r HEM FL?“ \ Hq quc’ J a _ Hug kgj/h 5m 1561;.“ MW Wm '~’ O" "4‘90 ‘anwmm+@fifl:aflwfinw%Hg7mwswgh 6/10 ...
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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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Lecture06 - ChE 210 Meeting 6 Outline(F&R Sections 4.2-4.3 Homework Due Friday Balance Equation 3.15 3.16 3.19 3.32 3.40 3.41 Labeling Process

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