To explore what happens if a nonvolatile component is in the feed to a flash distillation, modify Figure 2-B2 to add \(37.5 \mathrm{kmol} / \mathrm{h}\) of a nonvolatile component to the feed.

a. Keep drum temperature constant at \(10^{\circ} \mathrm{C}\) and determine a new V/F.

b. Keep V/F constant at V/F \(=0.589606\) (the answer in Figure 2-B2) and change the drum temperature.

c. Because the total feed rate has increased by \(37.5 \mathrm{kmol} / \mathrm{h}\), a better idea of the effect of the nonvolatile on temperature is obtained by operating with constant \(\mathrm{V}=88.409 \mathrm{kmol} / \mathrm{h}\) instead of constant V/F. Calculate V/F \(=\)

\(\mathrm{V} /(\) total feed rate \(=150+37.5)\), and use Goal Seek to determine the drum temperature.

Transcribed Image Text:

H A 1 Figure 2.B2 B MC flash, App 2B. C D E F G Eq 2-28 2 K const. aT1 aT6 ap1 ap2 3 M -292860 8.2445 -0.8951 59.847 4 nB -1280557 7.94986 -0.96455 0 5 nPentane -1524891 7.33129 -0.89143 0 6 nHex -1778901 6.96738 -0.84634 0 7 input T C 10 calc T deg F 50 8 input p Kpa 250 Feed rate 150 9 calc T deg R 509.7 calc p psia 36.253702 0.5 z nB 0.1 11 znpentane 0.25 10 zM 12 V/F guess 13 KM 14 KnB 15 KnPen 16 KnHex 17 18 RRM 19 RRnB 20 RRnPen 21 RRnHex 22 Sum RR 23 less error 0.15 znhex 0.589606 Formulas in Cells are listed below: = 51.87636 Cell B13: EXP(B3/(B9*B9)+C3+D3*LN(D9)+E3/(D9*D9)) 0.642416 Cell B14: EXP(B4/(B9*B9)+C4+D4*LN(D9)+E4/(D9*D9)) 0.175689 Cell B15: EXP(B5/(B9*B9)+C5+D5*LN(D9)+E5/(D9*D9)) 0.053999 CellB16: = EXP(B6/(B9*B9)+C6+D6*LN(D9)+E6/(D9*D9)) 0.820666 Cell B18: (B10 (B13-1))/(1+(B13-1)*B12) -0.04531 Cell B19: = (D10 (B14-1))/(1+(B14-1)*B12) -0.24057 Cell B20: (B11*(B15-1))/(1+(B15-1)*B12) -0.53479 Cell B21: = (D11*(B16-1))/(1+(B16-1)*B12) -4.2E-10 Cell B22: =SUM(B18:B21) -4.2E-07 Cell B23: = 1000*B22 24 Goal seek cell B23 = 0 by changing B12 to find V/F or changing B7 to find T 25 xM = 0.016131 Cell B25: B10/(1+(B13-1)*B12) 0.126716 Cell B26: D10/(1+(B14-1)*B12) 0.291839 Cell B27: = B11/(1+(B15-1)*B12) 0.565314 Cell B28: D11/(1+(B16-1)*B12) 1 Cell B29: =SUM(B25:B28) 88.4409 Cell B30: = B12*D8 61.5591 Cell B31: = D8-B30 26 xnb 27 xnPen 28 xnHex 29 Sum 30 V 31 L 32 yM 0.836796 33 ynB 0.081404 34 ynPen 0.051273 35 ynhex 0.030526 36 sum y 1