26._Mar-26 - {ll points Methanol is synthesized from CD and...

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Unformatted text preview: _ {ll} points). Methanol is synthesized from CD and H3 in a catalytic reactor. The fresh feed to the _ contains 13.{} mole% N2. A fractional single-pass conversion is attained in the reactor. The reactor Note Title 3/26/2008 process contains 32.11] mole% CD, 64.0 mole% H2, and 4.0 mole% N2. This stream is mixed with a — recycle stream in a ratio 5 mol recycle 1’ 1 mo] fi'esh feed to produce the feed to the reactor, which — effluent goes to a condenser from which two streams emerge; a liquid product stream containing — essentially all the methanol formed in the reactor, and a gas stream containing all the CD, H2, and N3— _ leaving the reactor. The gas stream is split into two fractions: one is removed from the process as a _ purge stream and the other is the recycle stream that combines with the flesh feed to the reactor. A _ basis of calculation is tilt} molefhr fl'esh feed. 32 mol com as mol H2! h 4 mol mph Pu rge . Hafil-i flow} n ouroedl _ g ”was; — —-—N.-_ extent ofrxn= t “- 6UUD-C 0.3T- 0C0 600X(0.8?- Jim-‘30) - 21: 600x013 ‘- 274...: 600 = 112 co =11: 2 — Dana — I11 @M/e //, /’/ {KW} _ Dilfereatia! Balances on a Chemical Reactor _ A continuous stirred-tank reactor is used to produce a compound R in the liquid-phase reaction _ A —> R. Feed enters the reactor at a rate of aims); the concentration of the reactant in the feed is CAo(mol ML). The volume of the tank contents is V(L)- The vessel may be considered 2‘ erfectl; — mixed so that the concentration of A in the product stream equals that in the tank. For this process — _ fie of consumption of A equals kC moms-L of reaction volume“. All fluids (the feed, the _ tank contents, and the product) may e en to have the same density, p(gfL). — Write differential balances on total mass and on moles of A, expressing the balances in terms of — the variables shown on the following diagram: % A ———> IQ — _ sows} I .0 (all) CADImOINL) _I.J(USJ — 9(8le — Cg(m0|N|—) D 1 I -‘ MW) __ 9% - aza— — QM) 0 0W 0 o .1 -» _ 1 ' . x / 1 da— \/ I v v ’ ’ _— A A M4 A A b V'e- ...
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