C O M P A R A T I V E RESULTS OF DRYING AIR Test
Relative Positions in Series of Dehydrating Agents During Test*
Gain in Weight Grams
Moisture Adsorbed % of Total
0.0778 —0.001 ±0.0000 0.0002
99.9 — 0.1 0.0 0.2
A
1st—Activated Alumina 2nd—Calcium chloride 3rd—Sulfuric acid 4th—Phosphorus pentoxide
Β
1st—Phosphorus pentoxide 2nd—Calcium chloride 3rd—Sulfuric acid 4th—Activated Alumina
0.0764 0.0001 0.0002 0.0014
97.8 0.1 0.3 1.8
C
1st—Sulfuric acid 2nd—Activated Alumina 3rd—Calcium chloride 4th—Phosphorus pentoxide
0.0853 0.0042 0.0001 ±0.0000
95.2 4.7 0.1 0.0
D
1st—Calcium chloride 2nd—Sulfuric acid 3rd—Activated Alumina 4th—Phosphorus pentoxide
0.0698 0.0002 0.0034 ±0.0000
95.1 0.3 4.6 0.0
Ε
1st—Barium magnesium perchlorate 2nd—Phosphorus pentoxide 3rd—Activated Alumina
0.0931 0.0054 0.0042
90.2 5.6 4.2
F
1st—Activated Alumina 2nd—Barium magnesium perchlorate 3rd—Phosphorus pentoxide
0.1061 —0.0017 0.0032
99.0 — 1.6 2.6
G
1st—Phosphorus pentoxide 2nd—Barium magnesium perchlorate 3rd—Activated Alumina
0.1110 —0.0009 0.0070
94.8 — 0.8 6.0
•Weight of dehydrating agents employed: Activated Alumina 10.52 grams Phosphorus pentoxide 2.50 grams Sulfuric acid 7.24 grams '., Calcium chloride 10.27 grams '\ Barium magnesium EL perchlorate 18.53 grams
This comparison test proves superior adsorptive capacity o/ A L C O A A C T I V A T E D A L U M I N A Efficiency of a drying agent can be tested by measuring how completely it removes water from a stream of air of given moisture content. The table above shows results of such a test made on a comparative basis with these desiccants: ALCOA® Activated Alumina; phosphorus pentoxide; sulfuric acid (96% C.P.); calcium chloride; and barium magnesium perchlorate. The desiccants were placed in a series of U-tubes. High humidity atmospheric air was drawn through the tubes. This was repeated under comparable conditions for each of the arrangements of desiccants shown in the table. Study the test results. The superior performance of ALCOA Activated Alumina is clear! In laboratory tests . . . as in hundreds of industrial drying applications . . . ALCOA Activated Aluminas have proved to be the most reliable commercial desiccants available. They dry to dew points below minus 100°F.
They are nontoxic, chemically inert to most gases and vapors, and they will not soften, swell or disintegrate when immersed in water. They keep drying costs down because they can be reactivated an almost unlimited number of times with no serious drop in adsorptive efficiency. Whatever you dry . . . gases, liquids or vapors . . . the effective, low cost solution to your drying problems is ALCOA Activated Alumina. Get detailed information today. Write ALUMINUM COMPANY OF AMERICA, CHEM ICALS DIVISION, 703-C Alcoa Building, Pittsburgh 19, Pa.
ALCOA A L U M I N U M
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