An Improved Process for Manufacturing Nitrate of Ammonia or Chloride of Ammonia, Simultaneously Obtaining either Precipi- tated Phosphate of Lime or an Enriched Phosphate of Lime.
Year: 1891

page_text: Date of Application, 24th Oct., 1891-Accepted, 28th Nov., 1891
COMPLETE SPECIFICATION.
An Improved Process for Manufacturing Nitrate of Ammonia or
Chloride of Ammonia, Simultaneously Obtaining either Precipi-
tated Phosphate of Lime or an Enriched Phosphate of Lime.
We LUDWIG BRUNNER of Wetzlar in the Empire of Germany, and ADOLF
ZANNER of Laeken in the Kingdom of Belgium both Doctors of Medicine, 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 :-
This invention refers to an improved process for manufacturing nitrate of
ammonia or chloride of ammonia and of obtaining at the same time either precipi-
tated phosphate of lime or an enriched phosphate of lime. Poor phosphates,
especially such as are contaminated by carbonic lime or carbonate of lime or bones
are treated suinmarily or burned with nitric acid or hydrochloric acid, and the
quantity of the acid to be employed depends on whether it is desired only to enrich
the phosphate or to make a precipitate. In the first case only as much acid is
employed as is necessary for the decomposition of the carbonate of lime, so that
the residuum shows an enriched phosphate and usually also some of the phosphate
of lime which has not been taken up.
IV.
CaH (PO) + CаH₂O, = C₁₂H,(PO), + 2H,O, or
V.
-
CaH (PO), + 2NH, + Ca(NO), = C₁₂H,(PO₁), + 2NH.NO.
If it is desired to combine the enriching and precipitation of phosphate of lime,
the operations expressed by the formulæ I and IV or V should take place one after
[Price 4d.]

page_text: the other and in the same vessel. The precipitate being filtered a solution of
nitrate of calcium (IV) or of nitrate of calcium and nitrate of ammonia (V) remains,
from which the nitrate of calcium may be separated in three ways.
First. The nitrate of calcium may be precipitated by carbonate of ammonia or
by carbonic acid in a solution of ammonia.
Third. If the quantity of the nitrate of calcium is unimportant relatively to the
nitrate of ammonia, as it may be, especially after having treated the original
phosphate with a mixture of nitric or hydrochloric acid and sulphuric acid (III) and
after having precipitated the phosphoric acid by ammonia (V) it is also possible
to precipitate the remains of the nitrate of calcium by phosphoric acid in presence
of ammonia.
VIII.
2Ca(NO₂), + 2H,PO + 4NH, = Ca,H,(PO), + 4NHNO.
In this case it may be best to combine this operation with that expressed in the
formula V and to make both in the same vessel. The solution of nitrate of
ammonia filtered from the precipitate is then evaporated until crystallization
takes place.
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 :-
I. An improved process for developing nitrate of ammonia (or chloride of
ammonia) and for obtaining at the same time enriched phosphate or a precipitated
phosphate of lime in the following methods.
a. By treating natural phosphates or burnt phosphates or bones with nitric
acid (or hydrochloric acid) or both mixed with sulphuric acid.
b. By precipitating the phosphates of lime when in a solution by means of milk
of lime or ammonia or coal gas water.
c. By changing the resulting nitrate of lime into nitrate of ammonia or
chloride of calcium into chloride of ammonia by decomposing with carbonate
of ammonia, (coal gas water,) sulphate of ammonia or phosphate of ammonia,
as herein described and explained.
Dated this 24th day of October 1891
S. S. BROMHEAD,
97, Newgate Street, London, Agent for Applicants.