Year: 1898

page_text: I, LOUIS ETAIX, of 167, Rue de Rennes, Paris, France, Superintendent of the
Chemical Laboratory at the Faculty of Sciences of Paris, do hereby declare the
nature of this invention to be as follows :-
My invention has for its object a process for depriving acetylene gas of the
impurities which it generally contains and which consist of phosphides of hydrogen
and sulphuretted hydrogen. The process consists essentially in acting upon
acetylene gas by means of chloride of lime of commerce whether in its natural state
or in solution.
In the first case the chloride of lime in a solid form is spread out in a container
through which the acetylene gas to be purified is caused to pass. The chloride
may for example be spread upon superposed shelves or trays, or it may be employed
in bulk if mixed with pumice stone or other inert porous substance, to prevent the
material from packing.
In the second case the solution of chloride of lime is placed in a washer through
which the gas is caused to pass. For the chloride of lime solution there may be
substituted a solution of any other alkaline or alkaline-earthy hypochlorite.
The acetylene gas in traversing these solutions or on being brought in contact
with solid chloride of lime, becomes deprived of the phosphoretted hydrogen and
other phosphides of hydrogen it contains, which are absorbed and then oxidized.
The acetylene gas thus purified should then be deprived of the chlorine vapours or
of the chlorine compounds which it may have taken up for which purpose it is made
to pass over or through a lye of caustic soda or caustic potash.
It is to be understood that my invention resides in the process above described
and is independent of the kinds of apparatus employed for effecting the passage of
the acetylene over the substances or through the solutions above mentioned.
Apparatus for bringing a gas into contact with a solid substance or for causing it
to pass through a liquid being, moreover, well known and commonly employed in
chemical industry, require no special description.
Did this 16th don of Fahrmony 1908
A. M. & WM. CLARK,
Chartered Patent Agents, 53, Chancery Lane, London.

page_text: I, LOUIS ETAIX, of 167, Rue de Reunes, Paris, France, Superintendent of the
Chemical Laboratory at the Faculty of Sciences of Paris, do hereby declare the
nature of this invention, and in what manner the same is to be performed, to be
particularly described and ascertained in and by the following statement :-
My invention relates to a process for purifying acetylene gas by removing the
phosphides of hydrogen and sulphuretted hydrogen which it contains.
The process consists essentially in acting upon acetylene gas by means of chloride
of lime of commerce whether in the solid state or in solution, or any other
hypochlorite of an alkali or alkali-earth.
In the one case the chloride of lime is spread out in a chamber traversed by the
acetylene gas to be purified, upon superposed shelves or trays for instance, or it
may be employed in bulk if mixed with pumice stone or other inert porous
substance, to prevent the consolidation of the material.
In the other case the solution of chloride of lime (or of any other hypochlorite of
an alkali or alkali-earth) is placed in a washer and the gas is caused to pass
through it by any suitable means.
The acetylene gas on being brought into contact with the chloride of lime, or in
traversing the solution, becomes freed from phosphoretted hydrogen and other
phosphides of hydrogen it contains by absorption followed by oxidation, which has
the effect of destroying the phosphoretted hydrogen and sulphuretted gaseous
products, the oxidation products combining with and becoming fixed by the alkali
or alkaline-earthy base.
The acetylene gas thus purified should then be freed from the chlorine vapours
or compounds which it may have taken up, by being made to pass over or through
a lye of caustic soda or caustic potash.
My invention resides in the process described and is independent of the apparatus
employed for effecting the passage of the acetylene over or through the solid
substances or solutions above mentioned, such apparatus being well known and
commonly employed in chemical industry.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is
1. The step in the process of purifying acetylene gas which consists in bringing
the gas into contact with commercial chloride of lime either in the solid form or in
solution, or with a solution of any other alkaline or alkali-earthy hypochlorite for
the purpose specified.
2. The process of purifying acetylene gas which consists in bringing the gas into
contact with chloride of lime, or with any other alkaline or alkali-carthy
hypochlorite and then purifying it of any chlorine vapours or compounds which it
may have taken up, by means of a solution of caustic soda or potash substantially
as hereinbefore described.