THE MANUFACTURE OF ANHYDROUS OXIDE OF BARIUM follows
Year: 1885

page_text: We LEON QUENTIN BRIN and ARTHUR BRIN both of 7 Rue Gavarni Paris in
the Republic of France Civil Engineers do hereby declare the nature of said
Invention for "THE MANUFACTURE OF ANHYDROUS OXIDE OF BARIUM
follows:-
to be as
The object of our Invention is to prepare a chemically pure anhydrous oxide of
Barium in a manner which will render the process commercially available for use
in the process of separating the oxygen and nitrogen of atmospheric air or for
other purpose to which it is or may be applicable.
According to our Invention we take crystals of nitrate of Baryta which are dried
and placed in crucibles or equivalent vessels and heated to an exceedingly high
temperature (say 1000° to 1500° Centigrade)—This temperature should be gradually
attained and should be continued for such a time as will cause the contents of the
crucibles to become solid and assume a spongy appearance. We then close the
crucibles or vessels and keep the contents at a white heat for a considerable time
(say about 4 hours). The crucibles or vessels are then removed to an air tight
chamber in which a vacuum or partial vacuum is created and their contents are
allowed to cool therein-The chamber should be provided with testing and con-
trolling instruments such as a cock safety valve and manometer for testing and
controlling the vacuum and avoiding accidents-The material in the crucibles after
cooling in this vacuum chamber will be found to be a cohering spongy or porous
mass of very pure anhydrous oxide of Barium admirably suited for use in the
process for obtaining the oxygen and nitrogen of the atmosphere.
J. HENRY JOHNSON,
Agent for the said Leon Quentin Brin
and Arthur Brin.

page_text: We LEON QUENTIN BRIN and ARTHUR BRIN both of Paris in the Republic of
France Civil Engineers do hereby declare the nature of this invention for "THE
MANUFACTURE OF ANHYDROUS OXIDE OF BARIUM" and in what manner the same
is to be performed, to be particularly described and ascertained in and by the
following statement :—
The object of our invention is to prepare a chemically pure anhydrous oxide of
Barium or product of Baryta free from carbonic acid nitric acid and moisture in a
manner which will render the product commercially available for use in the process
of separating the oxygen and nitrogen of atmospheric air as described in the
Specification of our Application for a Patent numbered 157 of even date with this
but it may be used for any other purpose to which it is or may be applicable.
According to our Invention we take crystals of nitrate of Baryta which are
dried and placed in open crucibles or equivalent vessels (such for example as are
shewn in figure 1 of the accompanying drawings) and heated to an exceedingly
high temperature (say 1000° to 1500° Centigrade) This temperature should be
gradually attained and should be continued for such a time as will cause the
contents of the crucibles to become solid and assume a spongy appearance.
We
then close the crucibles or vessels and keep the contents at a white heat for a con-
siderable time (say about four hours) The crucibles or vessels are then removed to
an air tight chamber (such for example as is illustrated in figure 2) in which a
vacuum or partial vacuum is created or from which air or gases containing carbonic
acid or moisture are otherwise excluded for instance by filling the interior of the
chamber with a gas from which the baryta cannot take up carbonic acid or moisture.
The contents of the crucibles or vessels are allowed to cool in the said chamber
which should when a vacuum is employed be provided with testing or controlling
instruments such as a cock safety valve and manometer for testing and con-
trolling the vacuum and avoiding accidents-In the drawing an ordinary pump
is shewn for exhausting the air tight chamber-The material in the crucibles
after cooling in this chamber will be found to be a cohering spongy or porous
mass of very pure anyhydrous oxide of Barium or baryta free from carbonic acid
nitric acid and moisture and admirably suited for use in our aforesaid process for
obtaining the oxygen and nitrogen of the atmosphere.
Having now particularly described and ascertained the nature of our said
Invention and in what manner the same is to be performed we declare that what
we claim is
The manufacture of anhydrous oxide of Barium or baryta free from nitric acid
carbonic acid and moisture by heating nitrate of baryta and then cooling the same
or allowing it to cool in a vacuum or partial vacuum or in a space or chamber
from which moisture and carbonic acid are excluded substanstially as hereinbefore
described.