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Lecture10

# Lecture10 - ChE 210 Meeting 10 February 2 2011 Example...

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Unformatted text preview: ChE 210: Meeting 10 February 2, 2011 Example Problem a. (10 points) Gasohol is 10. volume % ethanol and 90. volume % gasoline. What is the mass fraction of ethanol in gasohol? (S.G ethanol = 0.789 and S.G. gasoline = 0.710) 3/6 ChE 210: Meeting 10 February 2, 2011 b. (14 points) Pure gasoline and pure ethanol are fed continuously to a mixer to produce gasohol. Draw the process flow diagram and label the streams with appropriate variables for the flow rates and compositions. Include known values from part (a) on the process flow diagram. 1 v N . c. (8 points) Based on the process flow diagram in part (b), how many degrees of freedom are there in this process? .l ' \ v,: H» '1 “ w“ J \mlyr‘ «‘5 l '1 t 4/6 ChE 210: Meeting 10 February 2, 2011 d. (12 points) Write the total mass balance equation and the species mass balance equations for gasoline and ethanol using the variables on the process flow diagram in part (b). Assume that the process is operating at steady state. Provide a reason for eliminating any terms from the general balance equation. l.‘ Total Massﬁ‘ H l Gasoline: Ethanol: e. (10 points) Calculate the mass flow rates of gasoline and ethanol (kg/h) needed to produce 200. kg/h of gasohol. 5/6 ChE 210: Meeting 10 February 2, 2011 f. (8 points) Use a scale factor to calculate the mass flow rates of gasoline and ethanol (kg/h) needed to produce 1000. kg/h of gasohol \ ; ~/ l ti \ ‘ .Jl" ‘ l \ Li H) 1 l (gt 1‘ /) ﬁ'l - I.“ ll» 1 “\y d ‘l ‘ l \\ » "\«V'Jx Yl’lel llk x ‘ ‘1 /‘1k '- ‘LL: 9 if ; V [K ll \ , \ 6/6 ...
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