IMPROVEMENTS IN THE MODE OF PRODUCING OR OBTAINING AMMONIC CHLORIDE
Year: 1884

page_text: I, THOMAS HESKIN of 37 Cobden Street Preston in the County of Lancaster,
Solicitor's Clerk do hereby declare the nature of said Invention for "IMPROVEMENTS
IN THE MODE OF PRODUCING OR OBTAINING AMMONIC CHLORIDE." to be as
follows:-
This invention relates to improvements in the mode of producing or obtaining
ammonic chloride whereby that substance may be produced in a crystallized or
concentrated form instead of in dilute solution requiring evaporation as heretofore..
According to my invention a solution of sodic borate is caused to absorb
sulphuretted-hydrogen gas forced into it under pressure boric acid being thereby
precipitated. The boric acid is then treated with strong ammonic hydrate so as to
combine therewith being thereby converted into ammonic borate. The ammonic
borate is dissolved by being subjected to the action of heat and whilst hot as much
Bodic chloride is added thereto as will dissolve therein. The mixture is then
allowed to cool gradually but not too rapidly or the required result would not be
effected and after standing for some time a double decomposition takes place
resulting in a gradual deposition of sodic borate in a solid state and a liquid
consisting of a solution of ammonic chloride. The liquid is removed from the
deposited sodic borate and is heated to about a boiling temperature when as much
boric acid as was used for the preparation of the ammonic borate is added thereto
the required quantity being obviously determined by the amount of the ammonic
borate to be produced in the first instance. As much ammonia gas is then passed
into the heated solution as the latter will absorb whereupon as much sodic chloride
as can be held in solution is dissolved therein. The solution is then allowed to
cool gradually as before described when a double decomposition will take place and
ammonic chloride will crystallize out and the liquid may then be removed.
I would observe that for the purpose of my invention potassic chloride may be
substituted for sodic chloride if thought desirable.

page_text: I, THOMAS HESKIN, of 37 Cobden Street, Preston, in the County of Lancaster,
Solicitor's Clerk, do hereby declare the nature of my invention for "IMPROVEMENTS
IN THE MODE OF PRODUCING OR OBTAINING AMMONIC CHLORIDE" and in what
manner the same is to be performed to be particularly described and ascertained
in and by the following statement :—
This invention relates to improvements in the mode of producing or obtaining
ammonic chloride whereby that substance may be produced in a crystallized or
concentrated form instead of in dilute solution requiring evaporation as heretofore.
According to my invention a solution of sodic borate is caused to absorb,
sulphuretted-hydrogen gas forced into it under pressure, boric acid being thereby
precipitated. The boric acid is then treated with ammonic hydrate in the proportion
by weight of parts of boric acid to 6 parts of ammonic hydrate having a specific
gravity of about 0.950 so as to combine there with being thereby converted into
ammonic borate. The ammonic borate is dissolved by being subjected to the action
of heat, preferably about 140 to 150 degrees (Fahrenheit), and whilst hot as much
sodic chloride (common salt) is added thereto as will dissolve therein. In practice.
I find the quantity of sodic chloride required will be in the ratio by weight of
about 2 parts of sodic chloride to 3 parts of boric acid and 6 parts of ammonic
hydrate of the specific gravity above mentioned. The mixture is then allowed to
cool gradually and must not be subjected to other than ordinary conditions of
temperature or the required result would not be effected. The mixture must stand
for about twelve hours after having cooled down to its normal temperature when
a double decomposition will have taken place resulting in a gradual deposition of
sodic borate in a solid state and a liquid consisting of a solution of ammonic
chloride. The liquid is removed from the deposited sodic borate and is heated to
about a boiling temperature when as much boric acid as was use 1 for the preparation
of the ammonic borate is added thereto, the required quantity being obviously
determined by the amount of the ammonic borate to be produced in the first
instance. As much ammonia gas is then passed into the heated solution as the
latter will absorb whereupon as much sodic chloride as can be held in solution is
dissolved therein. The solution is then allowed to cool gradually as before described
when a double decomposition will take place and ammonic chloride will crystallize
out and the liquid may then be removed.
I would observe that for the purpose of my invention potassic chloride may be
substituted for sodic chloride if thought desirable.
The mode of producing or obtaining ammonic chloride as above described may
be modified so as to be adapted to the process known in the alkali trade as the
ammonia process.
To this end the brine used in the said process (and which for
the purpose of adapting my invention to it is deemed to have a specific gravity
of 1.210) is allowed to absorb as much ammonia gas as will reduce its specific
gravity from 1.210 to about 1·160 and so in proportion for brine having a greater
or less specific gravity than above stated. Then to every 8 parts by weight of the
brine which has absorbed ammonia gas as above described is added 3 parts by
weight of boric acid. The whole is then heated and dissolved and allowed to stand
and cool as before described.

page_text: 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 mode of producing or obtaining ammonic chloride substantially as described.