IMPROVEMENTS IN MANUFACTURING CHLORINE FROM HYDROCHLORIC ACID
Year: 1884

page_text: PROVISIONAL SPECIFICATION.
I, WALTER WELDON, of Rede-Hall, Burstow, in the County of Surrey, Fellow
of the Royal Society,. do hereby declare the nature of the said Invention for
IMPROVEMENTS IN MANUFACTURING CHLORINE FROM HYDROCHLORIC ACID to be
as follows:-
i
The patent, numbered 967, which was granted to me in 1881, relates in part to
the manufacture of chlorine from chloride of magnesium.
Recently, my present correspondents and myself have applied for various further
patents relating to the manufacture of chlorine from chloride of magnesium,
The present invention relates to the manufacture of ehlorine from hydrochloric
acid, by first converting the chlorine of that acid into chloride of magnesium.
At present, chlorine is manufactured solely from hydrochloric acid, by. a process
which yields in the free state only one third of the chlorine contained in the acid
employed.
By neutralizing bydrochloric acid by magnesia, thus obtaining its chlorine as
chloride of magnesium, and then treating that chloride of magnesium by one or
other of the processes for obtaining chlorine from chloride of magnesium which are
the subject of the patent and of the applications for patents aforesaid, the whole
of the chlorine of the hydrochloric acid so treated may be obtained in the free
state.
It is not necessary that I should here describe the methods of obtaining chlorine
from chloride of magnesium, as they constitute no part of the present invention.
What is new in the present invention consists in first neutralizing by magnesia
the hydrochloric acid from which it is desired to obtain free chlorine, and then
treating the resulting chloride of magnesium for the obtainment of free chlorine
from it.
1001

page_text: I, WALTER WELDON, of Rede Hall, Burstow, in the County of Surrey, Fellow
of the Royal Society, do hereby declare the nature of the said Invention for
"IMPROVEMENTS IN MANUFACTURING CHLORINE FROM HYDROCHLORIC ACID,"
and in what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement
The present invention relates to the manufacture of chlorine from hydrochloric
acid, and it consists in neutralizing by magnesia the bydrochloric acid from which
it is desired to manufacture chlorine, and then treating the magnesium chloride so
obtained for the separation of free chlorine from it.
No particular method or methods of treating the said magnesium chloride for
the separation of free chlorine from it constitute any part of the present invention;
but the method which is believed to be the best consists in the following
operations!
Firstly, concentrating by evaporation solution of magnesium chloride until it
contains about six or not very much more than six equivalents of water.
Secondly, obtaining solid hydrated magnesium oxychloride by adding magnesia
to the said concentrated solution of magnesium chloride.
Thirdly, heating such solid magnesium oxychloride to a low temperature, to
drive off a portion of its water.
Fourthly, heating the product of the third operation to a high temperature in a
current of either air or oxygen.
This method of manufacturing cblorine from magnesium chloride, other available
methods of manufacturing chlorine from the same raw material, and appliances
and modes of procedure for carrying the said methods into effect, are the subjects
or among the subjects of the patents and applications for patents which are
numbered 967 and 968 of A.D. 1881; and 9304, 9305, 9306, 9307,9688, and 11305
of A,D. 1884,
What is new in the present invention is the use of hydrochloric acid as the
starting-point of the process of manufacturing chlorine from magnesium chloride,
by whatever method the manufacture of chlorine from the said magnesium chloride
may be performed, the manner of performing the present invention being to
neutralize hydrochloric acid by magnesia, and then, having obtained in the solid
state, either combined with magnesia or not, the magnesium chloride so produced,
to treat that magnesium chloride for the separation of chlorine from it by heating
it in contact with air or oxygen.

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
Manufacturing chlorine from hydrochloric acid by first neutralizing hydrochloric
acid by magnesia, and then, having obtained the resulting magnesium chloride in
the solid state, treating it for the separation from it of free chlorine by the reaction
upon it at an elevated temperature of air or oxygen.