Improvements in or connected with the Concentration of Sulphuric Acid.
Year: 1895

page_text: Date of Application, 27th Nov., 1895
Complete Specification Left, 28th Sept., 1896-Accepted, 24th Oct., 1896
PROVISIONAL SPECIFICATION.
Improvements in or connected with the Concentration of Sulphuric
Acid.
I, RICHARD ENGLAND, of 36, Mark Lane, in the City of London, Chemical.
Manufacturer, do hereby declare the nature of this invention to be as follows:-
My invention relates to the concentration of sulphuric acid and has for its object
to effect an economy in such concentration.
According to my invention instead of cooling the concentrated acid by means of
water as heretofore frequently practised I effect the cooling by means of the cold
dilute acid to be concentrated whereby such cold acid is more or less heated before
passing to the concentrating vessel. This arrangement has the further advantage
that in places where water has to be purchased it enables the use of water for
cooling as described to be dispensed with.
In some cases instead of proceeding as above described I cause the steam and
acid vapour given off during the concentration to pass through coils or the like in
the cold acid tanks whereby such cold acid is partially heated and the steam and
acid vapour condensed without the use of water, but it is to be understood that
both of the above described methods can be used in combination.
Dated the 27th day of November 1895.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.
Improvements in or connected with the Concentration of Sulphuric
Acid.
I, RICHARD ENGLAND, of 36, Mark Lane, in the City of London, Chemical
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 :-
My invention relates to the concentration of sulphuric acid and has for its object
to effect an economy in such concentration.
According to my invention I effect the cooling of the concentrated acid by
means of cold acid dilute (by which I mean chamber or weak acid) to be concen
trated, in place of using water (either wholly or in part) for this cooling which
heretofore has generally been employed. By this means I not only cool concen-
trated acid but the cold acid used for the purpose becomes more or less heated
before passing to the concentrating vessels whereby considerable economy is
effected by thus utilizing the heat taken up by the acid employed for cooling.
The dispensing of the necessity of using water either wholly or in part is of
considerable importance where water has to be purchased. Any suitable con-
struction of cooler may be employed.
I also utilize the heat of the steam and acid vapour, given off from the
concentrating vessels, by passing the said steam and acid vapour through coils or

page_text: the like in tanks into which cold acid is run whereby such acid is partially heated
preparatory to being passed to the concentrating vessels and the steam and acid
vapour condensed practically without the use of water.
It will be obvious that either of the above methods can be used either alone or
in combination.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. The cooling of concentrated sulphuric acid by means of cold chamber or weak
-sulphuric acid thereby utilizing the heat of the concentrated acid for heating acid
to be concentrated as herein before described.
2. Condensing the steam and acid vapour given off from acid concentrating
vessels by passing the said steam and acid vapour through coils or the like in
tanks into which cold acid is run, thereby utilizing the heat of the steam and acid
vapour for heating acid to be concentrated, substantially as described.
Dated the 28th day of Sentember 1806
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.