Page 327 - Process Equipment and Plant Design Principles and Practices by Subhabrata Ray Gargi Das

11.7 Design illustration e flash distillation 329

V
75°C, 10 kPa
Steam

F 10 kPa
3
12 m /hr 75°C

Condensate
L
75°C, 10 kPa
FIGURE 11.17
Schematic showing the design conditions of the flash drum.

Drum design

Feed (F, liquid)
Flow rate
Flow rate
3
3
Component % w/w MW r (mt/m ) m /hr mt/hr mt mol/hr
B 1.1 78 0.8787 0.132 0.116 0.00149
T 1.4 92 0.8636 0.173 0.149 0.00162
O-x 97.5 106 0.88 11.695 10.293 0.09710
100 0.8798 12 10.558 0.10021

V/F ¼ 0.1786 mol/mol; V ¼ 0.10021 0.1786 ¼ 0.0179 mt mol/hr.

Product (L, liquid)
3
Component % mol/mol mt mol/hr mt/hr m /hr
B 0.67 5.548 10 4 0.0433 0.0492
T 1.19 9.854 10 4 0.0907 0.1050
O-x 98.14 0.0812698 8.6145 9.7892
100 0.08281 8.7485 9.9434

3
r ¼ 8:7485=9:9434 ¼ 0:8798 mt=m ¼ 879:8kg=m 3
L
m L ¼ 8.7485 mt=hr ¼ 8748.5 kg=hr