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Unformatted text preview: 6- 296.40 (cont’d) b. The flow rate of propane in the exiting liquid must be the same as in Part (a) [same feed rate and fractional absorption], or ¡.nC H333838- mole0.006428 lb - mole C Hhlb - molelb - mol C Hh==10.726 lb0 06895The decane flow rate is 1.2 x10.66 = 12.8 lb-moles C10H22/h ⇒x20 068950 00536==../lb - mole C Hh0.06895 +12.8 lb - moles hlb - mole C Hlb - mole3838bgc. Increasing the liquid/gas feed ratio from the minimum value decreases the size (and hence the cost) of the column, but increases the raw material (decane) and pumping costs. All three costs would have to be determined as a function of the feed ratio. 6.41a. Basis: 100 mol/s liquid feed streamLet Bn - butane=, HC = other hydrocarbonspB*(30412120o2C)lb / inmm Hg≅=(from Figure 6.1-4) Raoult's law: yC)yC)P4o4oPx px pBBBB=⇒==×=**((..3030012521207600 3487 95% n-butane stripped: ¡...¡.nn440 348712 5 0 9534 06⋅=⇒=bgbgbgmol / sTotal mole balance: 3310034.06 88.12522.18 mol/snn+=+⇒=¡¡⇒mol gas fed22.18 mol/s22....
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This note was uploaded on 02/27/2012 for the course CHEMICAL E 312 taught by Professor Cheung during the Fall '11 term at The University of Akron.
- Fall '11