Question

5.3 The equilibrium partial pressure of water vapor in contact with a certain silica gel on which
water is adsorbed is, at 25°C, as follows:
Partial pressure
of water, mmHg
0
2.14
4.74
7.13
9.05
10.9
12.6
14.3
16.7
lb water/100 11
dry gel - kg/100 kg
0
5
10
15
20
25
30
35
40
293
(a) Plot the equilibrium data as - partial pressure of water vapor against * - wt fraction
water in the gel.
(6) Plot the equilibrium data as X - mol water/mass dry gel, Y - mol water vapor/mol dry
air, for a total pressure of 1 std atm.
(c) When 10 lb (4.54 kg) of silica gel containing 5 wt% adsorbed water is placed in a flowing
airstream containing a partial pressure of water vapor - 12 mmHg, the total pressure is I std atm
and the temperature 25°C. When equilibrium is reached, what mass of additional water will the gel
have adsorbed? Air is not adsorbed.
(d) One pound mass (0.454 kg) of silica gel containing 5 wt% adsorbed water is placed in a
vessel in which there are 400 ft (11.33 m') moist air whose partial pressure of water is 15 mmHg.
The total pressure and temperature are kept at 1 std atm and 25°C, respectively. At equilibrium,
what will be the moisture content of the air and gel and the mass of water adsorbed by the gel? Ans:
0.0605 kg water.
(e) Write the equation of the operating line for part (d) in terms of X and Y. Convert this into
an equation in terms of p and x, and plot the operating curve on p, x coordinates.
af 1 lb (0.454 kg) of silica gel containing 18% adsorbed water is placed in a vessel containing
500 fe (14.16 m) dry air and the temperature and pressure are maintained at 25°C and I std atm.
respectively, what will be the final equilibrium moisture content of the air and the gel.
(6) Repeat part ) for a total pressure of 2 std atm. Note that the equilibrium curve in terms of
X and Y previously used is not applicable.
tain activated charcoal at 33.3°C is
panj​

Answer 1

Answer:

and x, and plot the operating curve on p, x coordinates.

af 1 lb (0.454 kg) of silica gel containing 18% adsorbed water is placed in a vessel containing

500 fe (14.16 m) dry air and the temperature and pressure are maintained at 25°C and I std atm.

respectively, what will be the final equilibrium moisture content of the air and