An Improvement in the Manufacture of Sulphate and other Salts of Ammonia.
Year: 1893

page_text: Date of Application, 3rd Jan., 1893
Complete Specification Left, 3rd Oct., 1893-Accepted, 4th Nov., 1893
PROVISIONAL SPECIFICATION.
An Improvement in the Manufacture of Sulphate and other Salts of
Ammonia.
We, FRANCIS MUDIE SPENCE, and DAVID DICK SPENCE, both of The
Manchester Alum Works, Manchester, in the County of Lancaster, Chemical
Manufacturers, and GEORGE SISSON, also of The Manchester Alum Works,
Manchester, in the County of Lancaster, Chemist, do hereby declare the nature
of this invention to be as follows:-
Our invention relates to the manufacture of sulphate and other salts of ammonia
and consists in an improvement in the treatment of the ammoniacal liquor from
gas or other works for the production of sulphate or other salts of ammonia.
In the manufacture of sulphate and other salts of ammonia from ammoniacal
liquor, lime is used to drive off from such liquor the "fixed" aminonia contained
therein and the lime is usually slaked and mixed with water before being added
to the liquor.
Our invention consists in using a portion of the waste liquor from the still in
which the ammoniacal liquor is distilled instead of water for the slaking and
mixing of the lime. We prefer to do this by means of a suitable lime-mixer
provided with an agitator, the waste liquor as it flows from the still being allowed
to run or pumped into such lime-mixer in sufficient quantity to form milk of lime
for use in the still.
By means of our invention the following advantages are obtained, (a), The
milk of lime produced according to our invention is introduced hot into the still.
Thus a saving of fuel is effected as less steam is required than when as hitherto
cold or only slightly warm water is used for slaking and mixing the lime.
(b). Less waste liquor is produced and therefore less ammonia is lost in the waste.
liquor than in the process as hitherto carried out. (c) Any excess of lime which
may be contained in the waste liquor employed is utilized and thus less lime is
required in the process when our invention is employed than has hitherto been
necessary.
Dated this Second day of January 1893.
HOWARD
CHEETHAM,
Manchester, Agent to the Applicants.
COMPLETE SPECIFICATION.
An Improvement in the Manufacture of Sulphate and other Salts of
Ammonia.
We, FRANCIS MUDIE SPENCE, and DAVID DICK SPENCE, both of The
Manchester Alum Works, Manchester, in the County of Lancaster, Chemical
Manufacturers, and GEORGE SISSON, also of The Manchester Alum Works,
Manchester, in the County of Lancaster, Chemist, 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 :-
Our invention relates to the manufacture of sulphate and other salts of
ammonia and consists in an improvement in the treatment of the ammoniacal
liquor from gas or other works for the production of sulphate or other salts of
ammonia.
In the manufacture of sulphate and other salts of ammonia from ammoniacal
liquor, lime is used to drive off from such liquor the "fixed ammonia contained
"

page_text: therein and the lime is usually slaked and mixed with water before being added to
the liquor.
Our invention consists in using a portion of the waste liquor from the still in
which the ammoniacal liquor is distilled instead of water for the slaking and
mixing of the lime. We prefer to do this by means of a suitable lime-mixer
provided with an agitator, the hot waste liquor as it flows from the still being
allowed to run or pumped into such lime-mixer in sufficient quantity to form milk
of lime for use in the still.
By means of our invention the following advantages are obtained, (a), The
milk of lime produced according to our invention is introduced hot into the still.
Thus a saving of fuel is effected as less steam is required than when as hitherto
cold or only slightly warm water is used for slaking and mixing the lime.
(b), Less waste liquor is produced and therefore less ammonia is lost in the waste
liquor than in the process as hitherto carried out. (c), Any excess of lime
which may be contained in the waste liquor employed is utilized and thus less
lime is required in the process when our invention is employed than has hitherto
been necessary.
It is obvious that when a still is being first put into operation, the milk of lime
for use in the treatment of the ammoniacal liquor first supplied to such still will
require to be made by the slaking and mixing of lime with water in the manner
hitherto usual, the application of our invention being possible as soon as any
waste liquor is available for use in the slaking and mixing of further quantities
of lime for use in the treatment of further quantities of ammoniacal liquor.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
The hereinbefore described improvement in the treatment of ammoniacal liquor
from gas or other works for the production of sulphate and other salts of ammonia,
which consists in using hot waste liquor from the still in which the ammoniacal
liquor is distilled for the slaking and mixing into a "milk" of the lime to be
employed in such treatment, for the purposes and substantially in the manner
hereinbefore described.
Dated this Second day of October 1893.
HOWARD CHEETHAM,
Manchester, Agent to the Applicants.