Further purification to remove the remaining ammonia, sulphuretted hydrogen
and phosphorus containing compounds is accomplished by chemical means. If
this is considered necessary it can be easily accomplished by readily
available purifying apparatus which can be attached to any generator or
inserted between the generator and torch outlets. The following mixtures
have been used.
"_Heratol,_" a solution of chromic acid or sulphuric acid absorbed in
porous earth.
"_Acagine,_" a mixture of bleaching powder with fifteen per cent of
lead chromate.
"_Puratylene,_" a mixture of bleaching powder and hydroxide of lime,
made very porous, and containing from eighteen to twenty per cent of active
chlorine.
"_Frankoline,_" a mixture of cuprous and ferric chlorides dissolved in
strong hydrochloric acid absorbed in infusorial earth.
A test for impure acetylene gas is made by placing a drop of ten per cent
solution of silver nitrate on a white blotter and holding the paper in a
stream of gas coming from the torch tip. Blackening of the paper in a short
length of time indicates impurities.
_Acetylene in Tanks._--Acetylene is soluble in water to a very limited
extent, too limited to be of practical use. There is only one liquid that
possesses sufficient power of containing acetylene in solution to be of
commercial value, this being the liquid acetone. Acetone is produced in
various ways, oftentimes from the distillation of wood.
Pages:
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53