Year: 1885

page_text: We EDWARD WILLIAM PARNELL of 4 Clayton Square Liverpool in the County
of Lancaster Analytical Chemist and JAMES SIMPSON of the same place Alkali
Manufacturer do hereby declare the nature of this invention to be as follows:-
In the numerous attempts which have been made to produce sulphur by
decomposing sulphuretted hydrogen with sulphurous acid in accordance with the
formula
SO₂+2 H₂ S = 4 H₂ O + 3 S
it has always been found in practice that the sulphur obtained is. much less than
the theoretical quantity, the loss being generally attributed to the formation of
pentathionic or other sulphur acid not easily definable. Proposals have been made
to prevent the formation of said thionic acids by conducting the reaction between
the sulphurous acid and sulphuretted hydrogen in the presence of certain chlorides
such as those of calcium or magnesium, but the results have not been satisfactory.
The object of our invention is to produce sulphur by the above reaction in a
manner whereby the whole or nearly all of the sulphur contained in the two gases
shall be recovered either in the form of free sulphur or as sulphuric acid.
For this purpose we cause the reaction of the sulphurous acid on the sulphuretted
hydrogen to take place in the presence of sulphuric acid or vitriol of a suitable
density whereby the greater part of the sulphur contained in the two gases is
precipitated in the vitriol and may be separated by subsidence washing and
filtration, while any thionic acids that are formed will accumulate in the vitriol.
The latter is boiled from time to time till it is of a sufficient density when the
thionates will be decomposed with formation of free sulphur sulphurous acid and
vitriol. The sulphur can be separated as above described and the sulphurous acid
employed to decompose fresh sulphuretted hydrogen.
The vitriol can be used repeatedly and the accumulation arising from the
decomposition of the thionic acids can be removed and utilized as required.

page_text: As a suitable apparatus for conducting this process we recommend a leaden tower
filled with flints down which the vitriol is caused to flow while the sulphurous acid
and sulphuretted hydrogen are admitted near the bottom and caused to ascend in
the contrary direction to the vitriol. The concentration of the vitriol can be
conducted in the well known method by boiling in a leaden vessel with steam.
Dated this twenty third day of November 1885
апа эрнигис дога.
We EDWARD WILLIAM PARNELL of 4 Clayton Square Liverpool in the County of
Lancaster Analytical Chemist and JAMES SIMPSON of the same place Manufacturing
Chemist do hereby declare the nature of the said invention and in what manner
the same is to be performed, to be particularly described and ascertained in and by
the following statement:-
In the numerous attempts which have been made to produce sulphur by
decomposing sulphuretted hydrogen with sulpurous acid in accordance with the
formula
SO, × 2. H, S = 2. H, O × 3 S
it has always been found in practice that the sulphur obtained is much less than
the theoretical quantity the loss being generally attributed to the formation of
pentathionic or other sulphur acid not easily definable. Proposals have been made
to prevent the formation of said thionic acids by conducting the reaction between
the sulphurous acid and sulphuretted hydrogen in the presence of certain chlorides
such as those of calcium and magnesium but the results have not been satisfactory.
The object of our invention is to produce sulphur by the above reaction in a
manner whereby the whole or nearly all of the sulphur contained in the two gases
shall be recovered either in the form of free sulphur or as sulphuric acid.
For this purpose we cause the reaction of the sulphurous acid on the sulphuretted
hydrogen to take place in the presence of sulphuric acid or vitriol of a suitable
density say 15 to 20 Twaddle, whereby the greater part of the sulphur contained
in the two gases is precipitated in the vitriol and may be separated by subsidence,
washing and filtration while thionic acids all accumulate in the vitriol. This
operation may be conducted cold but we prefer a temperature of about 100 F.
The vitriol is boiled from time to time till it is of a sufficient density, say 15 to

page_text: 20 Twaddle, when the thionates will be decomposed, with formation of free sulphur
sulphurous acid and vitriol. The sulphur can be separated as above described and
the sulphurous acid employed to decompose fresh sulphuretted hydrogen.
The vitriol can be used repeatedly and the accumulation arising from the
decomposition of the thionic acids can be removed and utilized as required.
As a suitable apparatus for conducting this process we recommend a leaden tower
filled with flints down which the vitriol is caused to flow, while the sulphurous
acid and sulphuretted hydrogen are admitted near the bottom and caused to ascend
in the contrary direction to the vitriol. The concentration of the vitriol can be
conducted in the well known method by boiling in a leaden vessel with steam.
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 production of sulphur and sulphuric acid
consisting in treating sulphuretted hydrogen with sulphurous acid, in the presence
of sulphuric acid-The separation of the sulphur from the latter-boiling the
sulphuric acid and utilization of the sulphurous acid and vitriol thereby produced,
in the manner described.