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Lecture22 - ChE 210 Meeting 22 March 4 2011 Outline(F&R...

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Unformatted text preview: ChE 210: Meeting 22 March 4, 2011 Outline (F&R Sections 4.6-6.5) Homework Due Friday 03l11l2011 - Exam Review 6.14, 6.21, 6.26, 6.78, 6.88 Exam Monday 03/07l2011 3:10-4:00 pm 120 Ross Ethanol vapor (EtOH) is produced by the reaction of ethylene gas (E) with water vapor (W). in an undesired side reaction, ethanol vapor is converted to diethyl ether vapor (DE) and water vapor. One way to minimize the undesired side reaction is to keep the single pass conversion of ethylene lower than 0.10. To achieve an overall conversion of 0.80, the unreacted ethylene and water from the reactor are recovered and recycled. Two condensers are used in this recovery process. Most of the water vapor and a small amount of the ethanol vapor are condensed in the first condenser, and recycled to the reactor. The second condenser removes all of the remaining water and most of the ethanol from the vapor. 65% of the ethylene-rich vapor from the second condenser is recycled to the reactor, and the remainder is removed from the process. The feed to this process contains 1.5 moles of water per mole of ethylene, and the overall selectivity (the selectivity for the product streams exiting the process) is 5 moles of ethanol per mole of diethyl ether. 1/9 u 2.55: l E: N 595950 Sc 2 of fomc 3 10m: n 35m: I 3: me + E oNAmINov T Sc 3 of fom: E Iofuo N m: + :3 fmo E6 F u n. 0 cm? H k Logo—mom Ethanol vapor (EtOH) is produced by the reaction of ethylene gas (E) with water vapor (W). In an undesired side reaction, ethanol vapor is converted to diethyl ether vapor (DE) and water vapor. One way to minimize the undesired side reaction is to keep the single pass conversion of ethylene lower than 0.10. To achieve an overall conversion of 0.80, the unreacted ethylene and water from the reactor are recovered and recycled. Two condensers are used in this recovery process. Most of the water vapor and a small amount of the ethanol vapor are condensed in the first condenser, and recycled to the reactor. The second condenser removes all of the remaining water and most of the ethanol from the vapor. 65% of the ethylene- rich vapor from the second condenser is recycled to the reactor, and the remainder is removed from the process. The feed to this process contains 1.5 moles of water per mole of ethylene, and the overall selectivity (the selectivity for the product streams exiting the process) is 5 moles of ethanol per mole of diethyl ether. "Process Sages nEfl * n‘.8 -. “EH2 Single 9055 conversion=o.io = fig.\“'nfi.5 OVCrQll Conversim = 0.80: “6.2. 'nen as” O.LoSn - n s. - - 5 k- E.3 O ‘9 “IS-tom, = 5.8 0 (95095.n- " “bf % 1.5%“..- nw.‘ . . = Emu) 0L Sue-d‘v‘kl “El-J = new“ ‘* new» 5 \mo\b£ —.—-—-----. “Den LE w \Ninbl‘l‘ PW: ne '3 4' nW-3 * “Elem“ “no.3 W.“ * “storm new... ? _ “gone. 9* (soc) ne.o"“k+oa.u+ “up ”ms *‘ natal-MS E+0H '5 5h” : PEN“ ’ {use Maine's Lou) "D pt, (QSQ and p" (500.) . n . H new BO“ “1 3‘4 : PE’tOH : - :1 Ta... +'n:<nu.3+nne.3 “ 8:1th wt! chm.“ .cum m0 ’02 696 r10 32 M So: u 5.65: I n m: In Ill ,. '1 cm Cd! N Lomcmucoo 9a 3 of fem: me + E owAmINov E :omINo All TI 9% E of fog E Iomrwo N m; + E fmo as F .u n. o R: u h Logommm ChE 210: Meeting 22 Degree of Freedom Analysis Reactor: H unknowns + 5K emm firm ’ H Newer mlames ‘ _ . . 1‘ ,)‘. A \ f a pm om «3.0 cm new) - O PMS) GER Condenser 1: ‘0 xmkngww's Kl WHMW bodanceS “ O (3an ”spec ’0 {Sn-gs CM '3. PM“) law WLE sireams 35:4) . «1" be? JV 4/9 ,.. 3) March 4, 2011 um L3 minis Cdtbm batarms VH curvm bQLianéL is PM MWDQndmr a 9 Mars ChE 210: Meeting 22 Extent of Reaction Balances *Readtr E: (230 * “BE; "flag; ‘ g \l O 6/9 March 4, 2011 ChE 210: Meeting 22 March 4, 2011 Incomglete Combustion Occurs when CO is formed CZH4 + 302 9 2C02 + 2H20 Complete combustion CZH4 + 202 9 200 + 2H20 Incomplete combustion Cmstallization mL= ‘i' E‘XMQSO4,L= XH20,L= T=5t€ Crystallizer T = 50 F fXM9504,c= L XHZO,C= T = 50? Mama wwocrsdm ct" G 9mm “T and Crushim Mina-MK T matcutcfit com/mm m a? L *iiixv‘x immnnv dodt’k oi 51>? ,--~ ‘ ‘x .\ — A : , » fl , (“1 ~ - '- ’ 7 ' CM mi (IE/mg (in HA Us \fl 1mm SQUiK/Uji ii'i’L/ {mfg}; CL} i530? 8/9 ChE 210: Meeting 22 March 4, 2011 Other Questions 9/9 ...
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