IMPROVEMENTS IN THE MANUFACTURE AND STORAGE OF BI-CHROMATE OF SODA
Year: 1884

page_text: I, CHARLES STUART GORMAN of Irvine in the County of Ayr, North Britain
Manufacturing Chemist do hereby declare the nature of the said invention for
"IMPROVEMENTS IN THE MANUFACTURE AND STORAGE OF BI-CHROMATE OF SODA"
to be as follows:-
-
This Invention which relates to improvements in the manufacture and storage of
Bi-Chromate of Soda consists in placing in a furnace a mixture of about 250 parts
by weight of Chrome iron ore, about 150 parts by weight of Chloride of Sodium.
and about 250 parts by weight of hydrated lime.-This mixture when in the
furnace is acted upon by superheated steam at a suitable temperature which for
example may vary from 1,000°, to 1,600° Fahrenheit;-the steam being blown into
or upon the mixture. The result of which treatment is that, Hydro-chloric acid is
evolved and for the purpose of being collected the hydro-chloric acid is conveyed
to condensers. The sesqui oxide of chromium is oxidised to Chromic acid which
combining with the soda forms Chromate of Soda.-The chromate of soda is then
lixiviated in the ordinary manner and evaporated down to a strong solution, in
which condition it is further treated by sulphuric acid in the ordinary manner for
converting the Chromate into Bi-Chromate. In this state the liquid mass is or may
be allowed to cool in open coolers for the purpose of enabling the Chloride of Sodium
and Sulphate of Soda to separate out.
The resulting product is finally reduced to any desired consistency through
evaporating it by means of air heated from about 400° to 700° Fahrenheit being
turned into the vessel containing the Bi-Chromate product.
When this operation is complete the Bi-chromate is in a fluid condition in which
state it is run into metallic drums wherein it is kept for commercial purposes, or
the bi-chromate may be run into open trays which are placed on the platform or
chains of a travelling oven in passing through which the Bi-chromate is or may be
evaporated to dryness.
Dated this twenty ninth day of February 1884.
J. H. JOHNSON, DAY & JOHNSON,
Petitioner's Agents,
115, St Vincent Street, Glasgow.

page_text: I, CHARLES STUART GORMAN, of Irvine, in the County of Ayr, North Britain,
Manufacturing Chemist do hereby declare the nature of my invention for IMPROVE-
MENTS IN THE MANUFACTURE AND STORAGE OF BI-CHROMATE OF SODA and in
what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement.:-
This Invention, which relates to Improvements in the manufacture and storage
of Bi-chromate of Soda, consists in placing in a furnace a mixture of about
250 parts by weight of Chrome iron ore, about 150 parts by weight of Chloride of
Sodium, and about 250 parts by weight of hydrated lime. This mixture when in
the furnace is acted upon by superheated steam at a suitable temperature which
for example may vary from 1,000° to 1,600° Fahrenheit; the steam being blown
into or upon the mixture. The result of this treatment is that Hydro-chloric acid
is evolved and for the purpose of being collected, the Hydro-chloric acid is conveyed
to condensers. The sesqui-oxide of Chromium is oxidised to Chromic acid which
combining with the Soda forms Chromate of Soda.-The Chromate of Soda is then
lixiviated in the ordinary manner and evaporated down to a strong solution, in
which condition it is further treated by sulphuric acid in the ordinary manner for
converting the Chromate into Bi-chromate.-In this state the liquid mass is or
may be allowed to cool in open coolers for the purpose of enabling the Chloride of
Sodium and Sulphate of Soda to separate out.
The resulting product is finally reduced to any desired consistency through
evaporating it by means of air heated from about 400° to 700° Fahrenheit being
turned into the vessel containing the Bi-chromate product.
When this operation is complete the Bi-chromate is in a fluid condition in which
state it is run into metallic drums wherein it is kept for commercial purposes, or
the Bi-chromate may be run into open trays which are placed on the platform or
chains of a travelling oven in passing through which the Bi-chromate is or may be
evaporated to dryness.
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:
First. The Manufacture of Bi-chromate of Soda in the manner hereinbefore
described.
Second. The storing of Bi-chromate of Soda in a fluid condition in drums
wherein it is kept for commercial purposes as hereinbefore described.
Dated this twelfth day of November 1884
J. H. JOHNSON, DAY & JOHNSON,
Applicant's Agents.