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

page_text: PROVIDIONAL DIECIFICATION
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 OF BI-CHROMATE OF SODA" to be as
follows:-
"
This Invention, which relates to Improvements in the manufacture of Bi-
Chromate of Soda, consists in using hydrochloric acid gas in a certain manner,
as hereinafter set forth, so as to produce Bi-chromate of Soda.
The neutral Chromate of Soda from lixiviating tanks is conveyed into tanks of
wood, brick, or stone, and the Hydrochloric acid gas from the furnaces wherein
Chloride of Potassium or Chloride of Sodium is being decomposed is conveyed by
pipes into a series of the tanks containing neutral Chromate of Soda by which it
is absorbed. The Hydrochloric acid gas converts the neutral Chromate of Soda
into Bi-Chromate of Soda and Chloride of Sodium is precipitated in the tanks,
thereby saving expense in evaporation. Should the neutral Chromate of Soda
liquors not absorb all the Hydrochloric acid gas in the tanks the remaining gas is
passed into a tower or condenser filled, with coke, flints, or bricks, and neutral
Chromate of Soda liquor is allowed to run down through the tower to absorb all
the remaining Hydrochloric acid gas. Should the Hydrochloric acid gas contain
any Sulphuric Acid vapour, a little Carbonate of Line is added to the neutral
Chromate of Soda liquors which removes all the Sulphuric Acid as Sulphate of
Lime.
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
IMPROVEMENTS IN THE MANUFACTURE 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 of Bi-
Chromate of Soda, consists in using hydrochloric acid gas in a certain manner
as hereinafter set forth, so as to produce Bi-Chromate of Soda.
The neutral Chromate of Soda from lixiviating tanks is conveyed into tanks of
wood, brick, or stone and the Hydrochloric acid gas from the furnaces wherein
Chloride of Potassium or Chloride of Sodium is being decomposed is conveyed by
pipes into a series of the tanks containing neutral "Chromate of Soda by which it
is absorbed. The Hydrochloric acid gas converts the neutral Chromate of Soda
into. Bi-Chromate of Soda and Chloride of Sodium is precipitated in the tanks
thereby saving expense in evaporation. Should the neutral Chromate of Soda
liquors not absorb all the Hydrochloric acid gas in the tanks, the remaining gas is
passed into a tower or condenser filled with coke, flints or bricks and neutral
Chromate of soda liquor is allowed to run down through the tower to absorb all
the remaining Hydrochloric acid gas. Should the Hydrochloric acid gas contain
any Sulphuric acid vapour a little Carbonate of Lime is added to the neutral
Chromate of Soda Liquors which removes all the Sulphuric acid as Sulphate of
Lime.
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 Manufacture of Bi-Chromate of Soda in the manner hereinbefore described.
J. H. JOHNSON, DAY, & JOHNSON,
Applicant's Agents.