Answer:
time = 4.89 min
Step-by-step explanation:
given data
volume = 15,000 ft³
ventilation rate of oven = 2,100 cubic feet per minute
safety factor (K) = 3
evaporates at a rate = 0.6 cubic feet per minute
solution
we get here first solvent additional rate in oven that is
solvent additional rate =
solvent additional rate = 4 ×
min
solvent additional rate == 4 ×
×
solvent additional rate = 40 ppm/min
and
solvent removal rate due to ventilation will be
removal rate =
× concentration in ppm
removal rate = 0.14 C ppm/min
and
net additional rate is
net additional rate (c) = m - r
so net additional rate (c) is = 40 - 0.14C
so here
= 40 - 0.14C
so take integrate from 0 to t
=
....................1
here factor of safety is 3 so time taken is
solve it we get
time =
time = 4.89 min