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Two humid gas streams are combined in a heated mixing chamber. The first stream contains 23.5 mole% ethane and 76.5% ethylene on
a dry basis and enters the chamber at 25.0°C and 105 kPa at a rate of 135 L/min. The second stream is humid air, which enters at
75.0°C and 115 kPa at a rate of 375 L/min. The product stream emerges at 65.0°C and 1.00 atm.
A hygrometer is used to measure the water contents of the two feed streams and the combined product stream. The calibration curve
for the hygrometer is a straight line on a semilog plot of y (mole fraction of water) versus R (hygrometer reading), which passes through
the points ($y = 2.00 \times 10^{-4}$, $R = 6.0$) and ($y = 0.4$, $R = 90.0$).
The following readings are recorded.
Hydrocarbon Feed Stream: R = 78.0
Air Feed Stream: R = 14.8
(b) Calculate the volumetric flow rate of the product stream and the molar composition of the prod-
uct gas on a dry basis.
(c) Calculate the partial pressure of water in the product gas and the hygrometer reading for this
stream.
Select the appropriate form of the equation and the values of the coefficients that describe the hygrometer behavior.
$y = AR + B$
$y = A \log(R) + B$
$y = \frac{AR}{B}$
$\log(y) = A \log(R) + B$
$y = B \exp[A \cdot R]$
A = 0.000116
B = 0.0905
