.11????? 11:39 AM Back curse design.docx 1. Title: Tray column design of separat
ID: 637617 • Letter: #
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.11????? 11:39 AM Back curse design.docx 1. Title: Tray column design of separation of benzene-toluene 2: Assignment and operating conditions 2.1 Assignment Production capacity (inlet amount): F-90000 tly Operating period: 7200 h/y inlet composition: 40 wt% benzene Top product composition: 98 wt% benzene Bottom product composition: 2 wt% benzene 2.2 Operation condition Operating pressure: 1 atm Feed condition: feed at bubble point Pressure drop of a single plate: 0.7kPa 2.3 Type of column: plate column, column internals: sieve trays 2.4 Location: Dalian City 3. Contents 3.1 The selection of design scheme and process instruction Basic principle, kind of plates, Part of column, operating pressure, heating method, selection of R, utilization of heat. 3.2 Calculations 3.2.1 Equilibrium: t-x-y plot, x-y plot 3.2.2 Material balance (Notice: ty change to kg/h then to kmol/h) FB.D. ?, ?,?, 3.2.3 Operating line R, 3.2.4 Ideal plates number 3.2.5 Plate efficiency -017-0616gA : average viscosity of benzene and toluene 3.2.6 Actual plate numberExplanation / Answer
Equilibrium Curve: Draw the curve and get the number of stages required. Since the graph cannot be attached, please draw the graph using below data.
Mark xw, (xd/Rd+1), xf intercepts on the graph to estimate the number of stages.
Rd can be calculate as shown below.
Number of stages considering Rm is 16.
2 more stages will be added in both the criteris for condenser and reboiler.
Given: Feed 90000 TPA Period 7200 hr/year Let, F be the feed, T be the top product and B be the bottom product Overall material balance, F = B + T B = 90000 - T Component material balance on benzene 0.4 F = 0.98T + 0.02B So, 36000 = 0.98 T + 0.02 (90000 - T) T = 35625 T/y B = 54375 T/y The feed to the column is at bubble point. We will calculate the bubble point and dew point for the feed, top and bottom product. Feed = Bubble point T 367 K Component wt % kg/ y kmole/ y mole %, xi Vap pr, pis yi Benzene 40 36000 460.9 0.4 1.5 0.7 Toluene 60 54000 585.9 0.6 0.6 0.3 Total 100 90000 1046.8 1.0 1.0 Top = Dew point T 354 K Component wt % kg/ y kmole/ y mole %, yi Vap pr, pis xi Benzene 98 34912.5 447.0 0.983 1.0 1.0 Toluene 2 712.5 7.7 0.0 0.4 0.0 Total 100 35625 454.7 1.0 1.0 Bottom = Dew point T 383 K Component wt % kg/ y kmole/ y mole %, yi Vap pr, pis xi Benzene 2 712.5 9.1 0.02 2.3 0.0 Toluene 98 34912.5 378.8 0.98 1.0 1.0 Total 100 35625 387.9 1.0 1.0Related Questions
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