Production of Sulphuretted Hydrogen.
Year: 1886

page_text: Production of Sulphuretted Hydrogen.
We EDWARD WILLIAM PARNELL of Queens Park Chester, in the County of
Chester, Analytical Chemist, and JAMES SIMPSON of 8 Rumford Place Liverpool
in the County of Lancaster, Alkali Manufacturer, do hereby declare the nature of
this invention to be as follows:-
In our patent specifications numbered 381 193785 and 84405 we have described
certain processes for the manufacture of alkali and production of sulphuretted
hydrogen based on the decomposition of chloride of ammonium by means of
Le Blanc alkali waste or other material containing sulphide of calcium with
employment of carbonic acid. The object of our present Invention is the manu-
facture of carbonate of soda and production of sulphuretted hydrogen by another
modification in the method of employing the aforesaid materials, and is to be carried
out in the following manner.
The chloride of ammonium produced in the ammonia alkali process is decomposed
by means of Le Blanc alkali waste (or other material containing sulphide of
calcium) and heat as described in British Patent 381 and 193785 and the sulphide
of ammonium vapor which is given off is absorbed in water or in a weak ammo-
niacal solution as hereinafter described in a closed vessel till the solution contains
about 8 or 10 per cent of ammonia.
The solution of sulphide of ammonium produced in the foregoing operation is
after cooling subjected to the action of a current of carbonic acid gas preferably
in a tower such as is used in the Solvay alkali process, till a point is reached where
crystals of bicarbonate of ammonia are formed and sulphuretted hydrogen is
evolved. The latter after being washed in a solution of sulphide of ammonium
and water or in other suitable reagents to arrest any carbonic acid or ammonia
that may be carried over is conducted to a gasometer or other suitable receptacle
for use as may be required.
The crystals of bicarbonate of ammonia together with a portion of the mother
liquor are removed from the carbonating apparatus by any convenient means, and
the former after draining are employed for the manufacture of alkali by the well
known method of agitating in a solution of chloride of sodium when bicarbonate
of soda is formed which can be converted into mono carbonate by well known

page_text: means. The chloride of ammonium produced in the foregoing operation is
decomposed with alkali waste and heat to form sulphide of ammonium and the
operation is repeated.
The ammonia which is removed in the form of bicarbonate and mother liquor
from the carbonating apparatus is compensated for by the addition of sulphide
of ammonium so that the strength of the ammoniacal solution in the carbonating
apparatus is maintained at about the same degree. The mother liquor principally
consisting of a solution of mono and sesqui carbonate of ammonia which is
removed from the carbonating apparatus from time to time, and is employed after
cooling for absorbing sulphide of ammonium vapor from the stills.
By conducting the operation in the manner above described the addition of the
solution of sulphide of ammonium to the carbonating apparatus, the removal of
bicarbonate of ammonia and mother liquor, and the evolution of sulphuretted
hydrogen may be conducted simultaneously and continuously.
As the strength of the sulphuretted hydrogen which is given off will depend
on the strength of the carbonic acid gas employed it is desirable that the latter
shall be as pure as possible for which purpose we recommend the employment of
the process described in our Provisional specification filed simultaneously with this.
Dated this first day of January 1886.
J. T. KING,
Per J. Richman,
Agent for the Applicants.

page_text: Production of Sulphuretted Hydrogen.
We EDWARD WILLIAM PARNELL of Queens Park Chester in the County of
Chester, Analytical Chemist and JAMES SIMPSON of 8 Rumford Place Liverpool
in the County of Lancaster, Alkali Manufacturer 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:-
In our Patent Specifications No. 381 %, 1937, and 8440 %, we have described
certain processes for the manufacture of alkali and production of sulphuretted
hydrogen based on the decomposition of chloride of ammonium by means of
Le Blanc alkali waste or other material containing sulphide of calcium with
employment of carbonic acid.
The object of our present invention is the manufacture of Carbonate of Soda and
production of sulphuretted bydrogen by another modification in the method of
employing the aforesaid materials and is to be carried out in the following manner-
The chloride of ammonium produced in the ammonia alkali process is decomposed
by means of Le Blanc's alkali waste (or other material containing sulphide of cal-
cium) and heat as described in the specifications to British Patents 38185, and 19375,
and the sulphide of ammonium vapor which is given off is absorbed in water, or
in a weak ammoniacal solution as hereinafter described in a closed vessel till the
solution contains about 8 or 10 per cent of ammonia.
The solution of sulphide of ammonium produced in the foregoing operation is―
after cooling subjected to the action of a current of carbonic acid gas-preferably
in a tower such as is used in the Solvay alkali process-till a point is reached,
where chrystals of bicharbonate of ammonia are formed and sulphurretted hydrogen
is evolved. The latter after being washed in a solution of sulphide of ammonium
and water, or in other suitable reagents to arrest any carbonic acid, or ammonia
that may be carried over-is conducted to a gasholder, or other suitable receptac-
tacle for use as may be required.
The crystals of bicarbonate of ammonia, together with a portion of the mother
liquor are removed from the carbonating apparatus, by any convenient means, and
the former-after draining-are employed for the manufacture of alkali by the
well known method of agitating in a solution of chloride of sodiumn, when bicar-
bonate of soda is formed which can be converted into monocarbonate by well
known means.
The chloride of ammonium produced in the foregoing operation is decomposed
with alkali waste and heat to form sulphide of ammonium and the operation is
repeated.
The ammonia which is removed in the form of bicharbonate and mother liquor
from the carbonating apparatus is compensated for by the addition of sulphide of
ammonium in solution, so that the strength of the ammoniacal solution in the
carbonating apparatus is maintained at about the same degree. The mother liquor
consisting principally of a solution of mono and sesqui carbonate of ammonia, is

page_text: removed from the carbonating apparatus from time to time and is employed-
after cooling, for absorbing sulphide of ammonia vapor from the stills.
By conducting the operation in the manner above described: the addition of the
solution of sulphide of ammonium to the carbonating apparatus: the removal of
bicharbonate of ammonia and mother liquor and the evolution of sulphuretted
bydrogen may be conducted simultaneously and continuously.
As the strength of the sulphuretted hydrogen which is given off will depend on
the strength of the carbonic acid gas employed, it is desirable that the latter shall
be as pure as possible for which purpose we recommend the employment of the
process described in our Complete Specification No. 46, of the year 1886.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed, we declare that what
we claim is :-
The process herein described for the manufacture of Carbonate of Soda and pro-
duction of sulphuretted hydrogen consisting essentially in the following 5 operations
1st. The decomposition of chloride of ammonium from the ammonia alkali
process by means of Leblanc alkali waste, or other material containing sulphide of
calcium, and heat, forming sulphide of ammonium and chloride of calcium.
2nd. The absorption of the sulphide of ammonium formed in the preceding
operation by water or a weak alkaline solution.
3rd. The decomposition of the solution of sulphide of ammonium formed in the
preceding operation by means of carbonic acid gas, forming carbonate and bicar-
bonate of ammonia with evolution of sulphuretted hydrogen.
4th. The removal of the bicarbonate of ammonia formed in the preceding
operation from the carbonating apparatus and its employment for the manufacture
of alkali, by agitating with a solution of chloride of sodium.
5th. The addition of sulphide of ammonium in solution, to the carbonating
apparatus to compensate for the ammonia removed from it in the form of carbonate
and bicarbonate.