IMPROVEMENTS IN THE TREATMENT OF AMMONIACAL LIONOR OR GASWORKS
Year: 1862

page_text: LETTERS PATENT to Alexander Angus Croll, of Coleman Street, in the
City of London, Engineer, for the Invention of "IMPROVEMENTS IN THE
TREATMENT OF AMMONIACAL LIONOR OR GASWORKS"
PROVISIONAL SPECIFICATION left by the said Alexander Angus Croll at
the Office of the Commissioners of Patents, with his Petition, on the
27th June 1862.
I, ALEXANDER ANGUS CROLL, of Coleman Street, in the City of London,
Engineer, do hereby declare the nature of the said Invention for "IMPROVE-
MENTS IN THE TREATMENT OF AMMONIACAL LIQUOR OF GASWORKS," to be as
follows:-
The improvements have for their object economy in the treatment of
ammoniacal liquor of gasworks when obtaining salts of ammonia, as also the
avoidance or great mitigation of the inconvenience and annoyance arising from
the treatment of such liquor.
Steam from a suitable boiler is conveyed into ammoniacal liquor contained
in a suitable closed chamber, and the combined vapour and steam resulting
I are conveyed from the upper part of this chamber into other ammoniacal
liquor contained in another closed chamber placed somewhat higher than the
preceding, in order that as the ammoniacal liquor in the previous chamber
becomes spent it may be supplied from the second, and if desired other
number of such ammoniacal chambers may be employed. From the last
ammoniacal chamber the vapour resulting, combined with particles of steam,

page_text: are conveyed into a closed compartment or chamber of a vessel containing
acid adapted to the salt of ammonia desired to be obtained. Thus, supposing
the salt desired is sulphate of ammonia, then this last chamber will contain
sulphuric acid, and it is at its upper part divided into two compartiments, one
open at the top, the other closed by a cover, and a partition dipping below the
surface of the acid liquid therein and below the mouth of the pipe conveying
the vapour and steam thereto from the last ammoniacal chamber. Any vapour
arising from the closed compartment of this vessel is conveyed into similar
acid in another closed chamber used as a reservoir. From the upper part of
this last closed chamber the sulphuretted hydrogen liberated is conveyed to the
furnace supplying a vitriol chamber.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Alexander Angus Croll in the Great Seal Patent Office on
the 27th December 1862.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, ALEXANDER
ANGUS CROLL, of Coleman Street, in the City of London, Engineer, send
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twenty-seventh day of June, in the year of our Lord
One thousand eight hundred and sixty-two, in the twenty-sixth year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto me, the
said Alexander Angus Croll, Her special licence, that I, the said Alexander
Angus Croll, my executors, administrators, and assigns, or such others as I,
the said Alexander Angus Croll, my executors, administrators, and assigns,
should at any time agree with, and no others, from time to time and at all
times thereafter during the term therein expressed, should and lawfully might
make use, exercise and vend, within the United Kingdom of Great Britain
and Ireland, the Channel Islands, and Isle of Man, an Invention for "Im-
PROVEMENTS IN THE TREATMENT OF AMMONIACAL LIQUOR OF GASWORKS," upon. the
condition (amongst others) that I, the said Alexander Angus Croll, my execu-
tors or administrators, by an instrument in writing under my, or their, or one
of their hands and seals, should particularly describe and ascertain the nature
of the said Invention, and in what manner the same was to be performed,
and cause the same to be filed in the Great Seal Patent Office within six
calendar months next and immediately after the date of the said Letters
Patent.

page_text: NOW KNOW YE, that I, the said Alexander Angus Croll, 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 thereof, that is to say:
The improvements have for their object economy in the treatment of
ammoniacal liquor of gasworks when obtaining salts of ammonia, as also the
avoidance or great mitigation of the inconvenience and annoyance arising
from the treatment of such liquor.
Steam from a suitable boiler is conveyed into ammoniacal liquor contained
in a suitable closed chamber, and the combined vapour and steam resulting
are conveyed from the upper part of this chamber into other ammoniacal
liquor contained in another closed chamber placed somewhat higher than the
preceding, in order that as the ammoniacal liquor in the previous chamber
becomes spent it may be supplied from the second, and if desired other number
of such ammoniacal chambers may be employed. From the last ammoniacal
chamber the vapour resulting, combined with particles of steam, are conveyed
into a closed compartment or chamber of a vessel containing acid adapted to
the salt of ammonia desired to be obtained. Thus, supposing the salt desired is
sulphate of ammonia, then this last chamber will contain sulphuric acid, and
it is at its upper part divided into two compartments, one open at the top, the
other closed by a cover, and a partition dipping below the surface of the acid
liquid therein and below the mouth of the pipe conveying the vapour and
steam thereto from the last ammoniacal chamber. Any vapour arising from
the closed compartment of this vessel is conveyed into similar acid in another
closed chamber used as a reservoir. From the upper part of this last closed
chamber the sulphuretted hydrogen liberated is conveyed to the furnace sup-
plying a vitriol chamber.
By these means economy and the avoidance or great mitigation of the
inconvenience and annoyance arising from the treatment of the ammoniacal
liquor of gasworks is secured.
In witness whereof, I, the said Alexander Angus Croll, have hereunto
set my hand and seal, this Twenty-second day of December, in the
year of our Lord One thousand eight hundred and sixty-two.
A. ANGUS CROLL. (L.S.)