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ulfur dioxide content of the outlet of a combustion reaction is monitored by passing it through a SO 2 analyzer. The SO 2 analyzer reading
ulfur dioxide content of the outlet of a combustion reaction is monitored by passing it
through a SO analyzer. The SO analyzer reading was ppm parts per million parts by
mole The sample gas leaves the analyzer at Lmin at deg C and mmHg gauge and is
bubble through a tank that contains L of initially pure water. In the bubbler, SO is absorbed
and some of the water evaporates. The gas leaving the bubbler is assumed to be in equilibrium
with the liquid in the bubbler at deg C and atm absolute The SO content in the outlet gas
is monitored and when it hits ppm the water is replaced in the bubbler with fresh water.
A Why is this problem interesting to analyze? What principles apply to this problem?
B Use the following table to estimate the Henrys law coefficient for SO at deg C
g SO dissolved g
H O l
pSOmmHg
C Estimate the SO concentration in the bubbler solution mol SOL when the bubbler
solution is to be changed. Determine the molar composition of the outlet gas stream for
air, SO and water v Assume: The inlet and outlet gas stream obey ideal gas law. The
inlet gas stream is dry air and SO The water volume in the tank remains constant at
L since the amount of water evaporated is low. The tank is well mixed and the amount of
SO in the tank at any time is given by Henrys law.
# A
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