Steam Boilers and for Evaporating the Potash and Soda Leys.
Year: 1886

page_text: Date of Application, 27th May, 1886
Complete Left, 2nd Feb., 1887.
Complete Accepted, 15th Mar., 1887
[Communicated from abroad by MORITZ HONIGMANN, of Grevenberg, near Aachen,
in the Empire of Germany, Soda Manufacturer, through his Agents, Wirth and
Company, of Frankfort on the Main, Germany.]
Steam Boilers and for Evaporating the Potash and Soda Leys.
I, ALEXANDER MELVILLE CLARK, of the firm of A. M. and Wm. Clark, of
53, Chancery Lane, in the County of Middlesex, Fellow of the Institute of Patent
Agents, do hereby declare the nature of the said Invention to be as follows:-
:-
This Invention relates to a process for the preservation of the copper of which the
soda steam boiler and the vessels used for the evaporation of soda or potash leys are
made and the invention consists in the addition to the ley of metallic iron or a salt of
iron in order to decompose the soluble compounds of copper formed during the
working of the soda steam-boiler or the evaporation of the soda or potash ley's and
precipitate the copper. In working the soda steam boiler, it has been found that
copper as a material for the boiler is practically not attacked by soda-ley, but that
absolute immunity from attack is only obtained, provided the ley is quite free from
the oxides of copper as in that case only the ley has no solvent action on copper.
These oxides have a solvent property and appear to combine directly with copper,
and unless the leys be evaporated down with the utmost precaution it will be
impossible to prevent the formation of small quantities of copper oxides having a
solvent action on copper, the result being that the solubility of the copper speedily
increases especially as it is impossible to prevent all access of the oxygen of the
atmosphere.
.
By the addition, however to the leys of iron or a salt of this metal, such as sulphate
of iron, having the property of precipitating copper from its solutions, the ley is
deprived of all solvent power for copper.
A. M. CLARK.
By A. M. & Wm. Clark,
53, Chancery Lane, London,
Patent Agents.

page_text: Steam Boilers and for Evaporating the Potash and Soda Leys.
I, ALEXANDER MELVILLE CLARK, of the firm of A. M. and Wm. Clark, of
53, Chancery Lane, in the County of Middlesex, Fellow, of the Institute of Patent
Agents, do hereby declare the nature of this Invention (a communication to me from
abroad by Moritz Honigmann of Grevenberg near Aachen in the Empire of Germany,
Soda Manufacturer, through his Agents, Wirth and Company, of Frankfort on the
Main, Germany), 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 a method for the preservation of the copper of which the
soda steam boiler and the vessels used for the evaporation of soda or potash leys are
made and the invention consists in the addition to the ley, of metallic iron or a salt
of iron in order to decompose the soluble compounds of copper formed during the
working of the soda-steam boiler or the evaporation of the soda or potash leys and
precipitate the copper. In working the soda steam boiler, it has been found that
copper as a material for the boiler is practically not attacked by soda-ley, but that
absolute immunity from attack is only obtained provided the ley is quite free from
the oxides of copper as in that case only the ley has no solvent action whatever on
copper. These oxides when present have a solvent property and appear to combine
directly with the copper, and unless the leys be evaporated down with the utmost
precaution it will be impossible to prevent the formation of small quantities of copper
oxides having a solvent action on the copper of which the vessel is made, the result
being that the solubility of the copper speedily increases especially as it is impossible
to prevent all access of the oxygen of the atmosphere.
By the addition, however, to the leys, of iron or a salt of this metal, such as sulphate
of iron, having the property of precipitating copper from its solutions, the ley is
deprived of all solvent power for copper.
Having now particularly described and ascertained the nature of the said invention,
and in what manner the same is to be performed, I declare that what I claim is
--
The method of preserving or protecting the copper vessels used in the soda steam
boiler, or for the evaporation of soda or potash leys which consists in the addition to
the leys, of pieces of iron, or iron salts which possess the property of decomposing the
soluble copper compounds which may be formed, and precipitating the copper.
A. MELVILLE CLARK.
By A. M. & Wm. Clark,
53, Chancery Lane,
Patent Agents.