IMPROVEMENTS IN PURifying sulphuRIC AND SULPHUROUS ACIDS AND THEIR SALTS to be as follows
Year: 1884

page_text: I, JAMES MEIKLE, Junior, of 10 Lorne Terrace, Maryhill, in the County of
Lanark, North Britain, Chemist and Engineer do hereby declare the nature of my
said invention for "IMPROVEMENTS IN PURifying sulphuRIC AND SULPHUROUS
ACIDS AND THEIR SALTS to be as follows:-
"
My said Invention has principally for its object the economical treatment of
sulphuric acid such as that known as pyrites acid and containing arsenic, iron, and
other impurities, in order to render the same sufficiently pure for various important
uses; my improvements are however also advantageously applicable for treating
sulphurous acid and its salts as well as the salts of sulphuric acid; and it is one
recommendation of my Invention that in carrying it out an objectionable waste or
residuary product is utilised and got rid of.
My Invention consists in passing sulphureted hydrogen through the acid or
solution of acid or salt; or the sulphureted hydrogen may be introduced into the
lead chambers in which the sulphuric acid is formed. The effect is to form a
precipitate consisting of sulphides of the arsenic and iron; and this precipitate,
which is separated by filtration, may be utilised by burning so as to yield
sulphurous acid.
Sulphuric acid purified by my improved process is well suited for making
sulphate of ammonia of good quality from the bye-products of gas works and oil
works; and in this application more sulphureted hydrogen than is required for
treating the sulphuric acid used therein is given off along with the ammonia from
the stills. The sulphureted hydrogen may however be obtained in any convenient
known way, and the acid or salt purified by its means may be used for various
purposes.

page_text: I JAMES MEIKLE, Junior, of 10 Lorne Terrace, Maryhill, in the County of
Lanark, North Britain, Chemist and Engineer do hereby declare the nature of my
Baid invention for "IMPROVEMENTS IN PURIFYING SULphuric and sULPHUROUS
ACIDS AND THEIR SALTS" and in what manner the same is to be performed, to be
particularly described and ascertained in and by the following statement that is
to say :-
My said Invention has principally for its object the economical treatment of
sulphuric acid such as that known as pyrites acid and containing arsenic, iron,
and other impurities, in order to render the same sufficiently pure for various
important uses; my improvements are however also advantageously applicable in
the manufacture of sulphurous acid and its salts as well as the salts of sulphuric
acid;
and it is one recommendation of my Invention that in carrying it out an
objectionable waste or residuary product is utilised and got rid of.
My Invention consists in passing sulphureted hydrogen through the acid or
solution of acid or salt. The effect is to form a precipitate consisting of sulphides
of arsenic or other metals and this precipitate which is seperated by filtration may
be utilised by burning so as to yeild sulphurous acid.
Sulphuric acid purified by my improved process is well suited for making sulphate
of ammonia of good quality from the bye products of gas works and oil works
and in this application more sulphureted hydrogen than is required for treating the
sulphuric acid used therein is given off along with the ammonia from the stills.
The sulphureted hydrogen may however be obtained in any convenient known
way, and the acid or salt purified by its means may be used for various purposes.
Having now particularly described and ascertained the nature of my said
Invention and in what manner the same is to be performed I declare that what
I claim is
•
The purification of sulphuric and sulphurous acids and their salts by passing
sulphureted bydrogen through the acid or solution of acid or salt, as herein before
described.