416
(a)
FIGURE 27-2
Simple gas generators.
b)
TABLE 27-1
Desiccants
Formula
Mg(CIO 4 ) 2
P 4 0 10
CaCI 2 *
CaO*
NaOH
SiO 2 (silica gel)*
H 2 SO 4 (concentrated)
Dry Ice (CO 2 )*
Liquid N 2
Physical
state
Solid
Solid
Solid
Solid
Solid
Solid
Liquid
Solid
Liquid
Type of
container in
Figure 27-3
a
a
a
i
a
a
b
c
c
Cannot be
used to dry
Basic gases
Acidic gases
Acidic gases
Basic gases
Gases with
b.p. < -78°C
Gases with
b.p. < -195°C
Removes H 2 0
by forming
Mg(CIO 4 ) 2 -6 H 2 0
H 3 P0 4
CaCI 2 • 6 H 2 0
Ca(OH) 2
NaOH solution
Adsorbed water
Dilute H 2 S0 4
Solid H 2 0
Solid H 2 0
' Relatively cheap, safe, and simple to use
(a)
FIGURE 27-2
Simple gas generators.
b)
TABLE 27-1
Desiccants
Formula
Mg(CIO 4 ) 2
P 4 0 10
CaCI 2 *
CaO*
NaOH
SiO 2 (silica gel)*
H 2 SO 4 (concentrated)
Dry Ice (CO 2 )*
Liquid N 2
Physical
state
Solid
Solid
Solid
Solid
Solid
Solid
Liquid
Solid
Liquid
Type of
container in
Figure 27-3
a
a
a
i
a
a
b
c
c
Cannot be
used to dry
Basic gases
Acidic gases
Acidic gases
Basic gases
Gases with
b.p. < -78°C
Gases with
b.p. < -195°C
Removes H 2 0
by forming
Mg(CIO 4 ) 2 -6 H 2 0
H 3 P0 4
CaCI 2 • 6 H 2 0
Ca(OH) 2
NaOH solution
Adsorbed water
Dilute H 2 S0 4
Solid H 2 0
Solid H 2 0
' Relatively cheap, safe, and simple to use