IM- PROVEMENTS IN OBTAINING OXIDE OF MANGANESE FROM THE CHLORIDE, WHICH IMPROVEMENTS ARE APPLICABLE FOR MANUFACTURING NITRATES OF THE ALKALIES, AND FOR OBTAINING FREE CHLORINE PROM CHLORIDES
Year: 1875

page_text: LETTERS PATENT to Donald Dow and James Telfer, both of Glasgow,
in the County of Lanark, North Britain, for the Invention of " IM-
PROVEMENTS IN OBTAINING OXIDE OF MANGANESE FROM THE CHLORIDE, WHICH
IMPROVEMENTS ARE APPLICABLE FOR MANUFACTURING NITRATES OF THE
ALKALIES, AND FOR OBTAINING FREE CHLORINE PROM CHLORIDES."
Sealed the 9th December 1875, and dated the 8th September 1875.
PROVISIONAL SPECIFICATION left by the said Donald Dow and James
Telfer at the Office of the Commissioners of Patents, with their
Petition on the 8th September 1875.
We, DONALD Dow and JAMES TELFER, both of Glasgow, in the County
of Lanark, North Britain, do hereby declare the nature of the said
Invention of "IMPROVEMENTS IN OBTAINING OXIDE OF MANGANESE FROM THE
CHLORIDE, WHICH IMPROVEMENTS ARE APPLICABLE FOR MANUFACTURING NITRATES
OF THE ALKALIES, AND FOR OBTAINING FREE CHLORINE' FROM CHLORIDES," to be as
follows, that is to say :-
This Invention relates to improvements in obtaining oxide of man-
ganese from the chloride, and which improvements are also applicable

page_text: for manufacturing nitrates of the alkalies, and for obtaining free chlorine
from chlorides. generally:
In treating chlorides of manganese the chlorine residues (consisting
_of manganese chloride with excess_of_hydrochloric acid) are either
evaporated to dryness and mixed with manganese dioxide and nitric
acid, or the manganese oxide and nitric acid may be added to the liquor
consisting of chloride of manganese with excess of hydrochloric acid,
when the chlorine is liberated and may be collected in a vessel and
utilised. All the chlorine under either of these modes of treatment
being given off the residue, consisting of nitrate and oxide of man-
ganese, is evaporated and heated when the nitrate of manganese is
decomposed, the fumes or gases given off in the process being passed
into any suitable apparatus wherein they are condensed and form nitric
acid, which is employed in treating fresh quantities of the chlorine
residue. Black oxide of manganese remains in the vessel after the
nitric acid fumes have passed off, which substance may be mixed with
hydrochloric acid and again employed in obtaining chlorine.
In obtaining chlorine from the alkalies according to this Invention,
the chloride of the alkali is mixed with nitric acid and manganese
dioxide, when the chlorino is liberated and may be collected in a vessel
and utilised. The chlorine having thus passed off, the residue, consisting
of nitrate of the alkali and nitrate and oxide of manganese, is evaporated
and heated until all the nitrate of manganese is decomposed.
nitrate of the alkali is then separated by lixiviation.
The
The proportions which it is preferred to employ in practising this
Invention are equal weights of the chlorides with oxide of manganese,
and with twice the weight of the mixture of nitric acid having a specific
gravity of about 1:33-degrees; but although these are the proportions
preferred to be used it is to be understood that any other suitable pro-
portions may be adopted.