Year: 1887

page_text: Date of Application, 14th July, 1887
(Complete Left, 29th Mar., 1888
Complete Accepted, 4th May, 1888
We EDWARD WILLIAM PARNELL and JAMES SIMPSON of 84 Rumford Place,
Liverpool, in the County of Lancaster, Manufacturing Chemists do hereby declaro
the nature of this invention to be as follows :-
-:
If a mixture of Le Blanc alkali waste or other material containing sulphide of
calcium and a solution of carbonate or bicarbonate of Ainmonia or a mixture thereof-
be heated to boiling point-a reaction takes place resulting in the formation of
insoluble carbonate of Lime with evolution of Sulphide of Ammonium or with the
evolution of a mixture of sulphide of Ammonium, Sulphuretted hydrogen and free
Ammonia If these vapors be absorbed in water and a current of carbonic acid passed
through the solution-the ammonia will be again converted into carbonate available
for the repeated treatment of a further quantity of waste while sulphuretted hydrogen
will be evolved and may be utilized in any convenient manner.
This process if worked by itself can only be commercially profitable under very
exceptional circumstances as the proportion of sulphur in the waste is too small to
pay for the cost of fuel-loss of ammonia—wages and other expenses unless it can
be sold at an exceptionally high price-but we have discovered that by combining
this process with our patented method of utilizing Le Blanc Alkali Waste or other
material containing Sulphide of Calcium in the manufacture of Alkalies—as set forth
in British Patents 381, 19378 and 478, it can be carried into operation advan-
tageously and at a very moderate cost.
In carrying our invention into practice, instead of heating the mixture of chloride
of Ammonium and Carbonates of Ammonia and Soda which drain from the precipitated
Bicarbonate of soda formed in the Ammonia Alkali process prior to its introduction
to the still (as is usually done in order to save lime by previously volatilizing the

page_text: Carbonates of Ammonia) we decompose the entire mixture (without previous heating)
by distilling the same with alkali waste or other material containing sulphide of
calcium. By this means-in addition to the sulphide of calcium decomposed by
means of chloride of Ammonium-A further quantity is decomposed by the action of
the carbonates-the latter forming carbonate of lime and sulphide of Ammonium
while the former yields chloride of calcium and also sulphide of Ammonium. The
sulphide of Ammonium produced by the aforesaid reactions is absorbed in brine and
treated with carbonic acid-yielding Bicarbonate of soda and sulphuretted hydrogen
as set forth in the patents aforesaid.

page_text: We EDWARD WILLIAM PARNELL and JAMES SIMPSON of 8ª Rumford Place
Liverpool in the county of Lancaster Manufacturing Chemists 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 :-
If a mixture of Le Blanc Alkali Waste or other material containing Sulphide of
Calcium and a solution of carbonate or bicarbonate of Ammonia or a mixturo
thereof be heated to boiling point a reaction takes place resulting in the formation
of insouluble carbonate of lime with evolution of Sulphide of Ammonium or with the
evolution of a mixture of Sulphide of Ammonium sulphuretted hydrogen and free
Ammonia. If these vapours be absorbed in water and a current of Carbonic Acid
passed through the solution, the Ammonia will be again converted into Carbonate
available for the repeated treatment of a further quantity of waste while sulphuretted
hydrogen will be evolved and may be utilized in any convenient manner.
This process if worked by itself can only be commercially profitable under very
exceptional circumstances the proportion of Sulphur in the waste is too small to pay
for the cost of fuel loss of Ammonia wages and other expenses unless it can be sold
at an exceptionally high price but we have discovered that by combining this process
with our patented method of utilizing Le Blanc Alkali Waste or other material
containing Sulphide of Calcium in the manufacture of Alkalies as set forth in British
Patents 381 1937 478 it can be carried into operation advantageously and at a
very moderate cost.
In carrying our invention into practice instead of heating the mixture of Chloride
of Ammonium and carbonates of ammonia and soda which drain from the precipitated
bicarbonate of soda formed in the Ammonia Alkali process prior to its introduction
to the still (as is usually done in order to save lime by previously volatilizing the
carbonates of ammonia) we decompose the entire inixture (without previously heating)
by distilling the same with alkali waste or other material containing sulphide of
calcium. By this means in addition to the sulphide of calcium decomposed by means
of chloride of ammonium a further quantity is decomposed by the action of the
carbonates the latter forming carbonate of lime and sulphide of ammoniam while the
former yields chloride of calcium and also sulphide of ammonium. The sulphide of
ammonium produced by the aforesaid reactions is absorbed in brine and treated with
carbonic acid yielding bicarbonate of soda and sulphuretted hydrogen as setforth in
the patent aforesaid.

page_text: 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 combination of the process for treating Le Blanc alkali waste, or other material
containing sulphide of Calcium with carbonate of ammonia for the production of 5
sulphuretted hydrogen and carbonate of lime as set forth in the beginning of this
specification with the manufacture of alkali by the decomposition of chloride of sodium
in a solution of sulphide of ammonium by means of carbonic acid.
Dated the 28th day of March 1900