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. The
reaction is affected in a glass tube, which is contained
in a cylindrical reservoir. The sample of gas is passed
into the burette and measured. The sample is then drawn
through the interconnecting rubber and glass tubing into
the reaction chamber where the oxygen reacts with copper
to form copper oxide. The oxide formed is immediately dissolved
by the solution of Ammonium Chloride in Ammonium Hydroxide.
When the reaction is complete the residual gas is returned
to the burette for measurement. The apparatus is calibrated
to give a direct reading for oxygen purity, in the region
of 99.6%.
Test Apparatus for safety of Oxygen filling plant , Nitrogen filling plant , Acetylene filling plant:
The test apparatus for safety of Oxygen filling gas plant , Nitrogen filling
gas plant , Acetylene filling gas plant is as per sketch enclosed:
There is a gas entry (I) at the right extreme where sample
gas can be hosed. There is a 3- way stop cock. 'G' to permit
the gas to be bubbled through glass tube ' inserted in a
purging vessel ( or to the burette) as desired). There is
a graduated. burette 'A' in the middle, connected on one
side with the purging vessel and the other side with the
reaction chamber '0' through a 3 - way stop cock 'H'
the
burette is connected with a leveling bottle by a rubber
pipe. The reaction chamber is enclosed by a reservoir
'E'.
There is a rubber cork fitted in the bottom of the reservoir
which also partly closes the reaction chamber bottom to
avoid the copper wire coming out of the chamber.
PREPARATION OF TEST:
Prepare the test solution by mixing one volume of Sp. Gr.O.90
Ammonium Hydroxide (NH40H) with two volumes of distilled
water and add Ammonium Chloride until solid crystals remain
undisclosed at the bottom of the container.
Invert the reaction chamber set, remove the rubber cork 'F' and fill the reaction chamber '0' with copper wire in spiral form replace the bung and return it in an upright position and connect with the burette tubing. Fill the reservoir and reaction chamber three quarter with fresh test solution with the leveling bottle 'B' held below the level of the burette, half fill the bottle with the test solution.
