P8-26B

(Position of reaction front) Using the computer program (or a slight variation thereof) given in Example 8-10, determine the effect on the temperature and conversion profiles of varying the inlet temperature when the reaction is c'anied out adiabatically. In particular, study the effect of the inlet temperature on the position of the reaction front (i.e., the position where the temperature rises very steeply).

Jawaban

Dengan menggunakan ms.excel, kita dapat melakukan simulasi pengaruh temperatur pada inlet terhadap konversi dan panjang reaktor pada kondisi adiabatik. Beberapa informasi untuk penyelesai masalah ini didapatkan dari example 8-10 diantaranya

Cp SO2 = 12.385 Cp O2 = 7.987 Cp SO3 = 17.235 Cp N2 = 7.42 dH (800) = -42471 Btu/lm mol SO2 dH (T0) = -42321 alpha = -1.563 beta = 0.00262 gamma = -0.000000738 ya0 = 0.11

yb0 = 0.1 yc0 = 0 yi0 = 0.79 R = 1.978 P0 = 2 atm Pa0 = ya0 * P0 = 0.11 * 2 = 0.22 atm Fa0 = 0.188 lbmol/h tube Kp = 7.8 atm-1/2

Ac = 0.0422 ft2

ρb = 33.8 lb/ft3

Dengan melakukan variasi terhadap T0, maka didapatkan data sebagai berikut :

To 1360X T Z0 1360 0

0.005175 1361.726 0.0701090.010224 1363.411 0.1402170.015156 1365.056 0.2103260.019976 1366.664 0.2804340.024691 1368.237 0.3505430.029306 1369.776 0.4206510.033825 1371.284 0.490760.038255 1372.762 0.5608680.042598 1374.21 0.630977

To 1370X T Z0 1370 0

0.004506 1371.5 0.0701090.008923 1372.971 0.1402170.013254 1374.413 0.2103260.017503 1375.829 0.2804340.021676 1377.218 0.3505430.025773 1378.582 0.420651

0.0298 1379.923 0.490760.033758 1381.241 0.5608680.037652 1382.538 0.630977

To

1380

X T Z0 1380 0

0.0039551381.31

40.07010

9

0.0078441382.60

70.14021

7

0.0116711383.87

90.21032

6

0.0154391385.13

20.28043

4

0.0191481386.36

50.35054

3

0.0228021387.57

90.42065

1

0.0264021388.77

6 0.49076

0.0299511389.95

50.56086

8

0.033451391.11

90.63097

7

To

1390

X T Z0 1390 0

0.003497 1391.160.07010

9

0.0069471392.30

50.14021

7

0.010351393.43

40.21032

6

0.0137081394.54

80.28043

4

0.0170231395.64

80.35054

3

0.0202971396.73

40.42065

1

0.0235291397.80

7 0.49076

0.0267231398.86

70.56086

8

0.0298791399.91

40.63097

7

To 1400X T Z0 1400 0

0.003116 1401.032 0.0701090.006196 1402.052 0.1402170.009241 1403.061 0.2103260.012253 1404.058 0.2804340.015232 1405.045 0.3505430.018179 1406.021 0.4206510.021096 1406.987 0.490760.023982 1407.943 0.5608680.026839 1408.889 0.630977

Dari hasil grafik diatas, dapat di lihat hubungan antara suhu pada inlet, konversi, dan panjang reaktor memiliki hubungan berbanding lurus. Hal tersebut dapat diakibatkan karena