Gas
Plants
Buyer's
Guide
The purity of the oxygen product and the oxygen content of the crude nitrogen gas is measured sample of gas and a highly activated form of copper contained in a saturated solution of Ammonium chloride in Ammonium Hydroxide.
Oxygen Gas Apparatus
- Sample gas can be hosed from the gas entry at the right extreme.
- A 3 way stop cock to permit the gas to be bubbled.
- The bubbling goes through the glass tube.
- The glass tube is inserted in a purging vessel.
- A graduated burette in the center.
- The burette is connected on one side with the purging vessel and
on the other with the reaction chamber.
- The chamber passes through another 3 way stop cock.
- Burette is connected with a levelling bottle by rubber pipe.
- Reaction chamber is enclosed with a reservoir.
- Rubber cork is fitted in the bottom of the reservoir.
- Mix one volume of Sp. Gr.0.90 ammonium hydroxide with two volume
of distilled water.
- Then add ammonium chloride until solid crystals are formed and
settle at the bottom.
- Invert the reaction chamber set and fill it with copper wire in
spiral form.
- Bring the copper wire in an upright position and connect with
the burette.
- Fill the reservoir and reaction chamber with test solution.
- Draw the test solution from the reservoir in the reaction
chamber by turning the burette stop cock .
- Squeeze the rubber pipe to expel all the air and then close the
stop cock, so that reaction chamber and the inter-connecting rubber
pipe are completely filled with test solution.
- The purging vessel is half filled with water and the sample gas
to be tested is allowed to bubble through water to atmosphere.
- Then controlling the flow of oxygen slowly open the stop cock
and allow the oxygen to pass into the burette.
- When burette is filled below the bottom mark, close the stop
cock.
- Adjust the level of the gas in the burette to the 100 cc mark by
holding the leveling bottom at the level of the liquid in the
burette.
- Then carefully open both the cocks and allow the gas to bubble
through the purging vessel to atmosphere.
- Pass the sample gas between burette and chambe rseveral times.
- The oxygen in the sample reacts with the copper to form an oxide
which dissolves in the solution.
- The unabsorbed impurities do not react with copper and are
transferred from the chamber to the buretter by lowering the
leveling bottle.
- Observe all the unabsorbed materials giving out the percentage
of impurities in the sample.
- This finally gives the percentage of oxygen in the sample indicating purity test of oxygen.
