(cont'd)
n 5.29 air = n CCl 2 O n air
PV 1 atm 2200 ft 3 28.317 L mol K = = 2563 mol air 3 RT 296.2K .08206 L atm ft = 0.0446 = 17.4 10 -6 = 17.4 ppm 2563
The level of phosgene in the room exceeded the safe level by a factor of more than 100. Even if the phosgene were below the safe level, there would be an unsafe level near the floor since phosgene is denser than air, and the concentration would be much higher in the vicinity of the leak.
d. Pete's biggest mistake was working with a highly toxic substance with no supervision or guidance from an experienced safety officer. He also should have been working under a hood and should have worn a gas 5.30 mask. CH 4 + 2O 2 CO 2 + 2 H 2 O 7 C 2 H 6 + O 2 2CO 2 + 3H 2 O 2 C 3 H 8 + 5O 2 3CO 2 + 4 H 2 O
1450 m 3 / h @ 15o C, 150 kPa n1 (kmol / h)
0.86 CH 4 , 0.08 C 2 H 6 , 0.06 C 3 H 8
n 2 (kmol air / h) 8% excess, 0.21 O 2 , 0.79 N 2
n1 =
1450 m3 h
273.2K 288.2K
b101.3 + 150gkPa
101.3 kPa
1 kmol
22.4 m3 STP
b g = 152 kmol h
Theoretical O 2 : 152 kmol 2 kmol O 2 3.5 kmol O 2 5 kmol O 2 + 0.08 + 0.06 0.86 h kmol CH 4 kmol C 2 H 6 kmol C 3 H 8 Air flow: Vair = 108 349.6 kmol O 2 . h
LM F NM GH
IJ K
FG H
IJ K
FG H
IJ OP = 349.6 kmol h O K QP
4
2
b
g
1 kmol Air 0.21 kmol O 2
22.4 m3 STP kmol
b g = 4.0 10
m3 STP h
b g
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