Year: 1886

page_text: I, JAMES MACTEAR, of N° 2 Victoria Mansions, in the City of Westminster,
Chemist, do hereby declare the nature of this Invention (a communication from
J. Kolb, of Lille, France, Manufacturing Chemist), to be as follows, that is to
say:-
This Invention has for its object to obtain the chlorides of barium and strontium
by improved processes which yield them at less cost than that at which they are
obtained by the processes hitherto in use.
In carrying out the Invention natural sulphate of baryta is used this substance
being more abundant and less costly than the natural carbonate hitherto used;
whilst for the hydrochloric acid hitherto employed and which is becoming of
increased price, chloride of calcium is employed, this substance being a waste or
residuary product in many chemical manufactures.
The sulphate of barium and chloride of calcium mixed with charcoal or other
suitable carbon and a little lime or chalk are strongly heated in a furnace, the
waste fire gases of which are. by preference utilised for drying the chloride of
calcium. The resulting product consists of chloride of barium and sulphide or
oxysulphide of calcium, and by lixiviation yields the chloride of barium free
or almost free from the sulphides.
The chloride of strontium is obtained from the sulphate in a similar manner, by
furnacing it with chloride of calcium, carbon, and a little lime or chalk.
EDMUND HUNT,
Applicant's Agent.

page_text: I, JAMES MACTEAR, of No 2 Victoria Mansions, in the City of Westminster,
Chemist, do hereby declare the nature of this invention (a communication from
J. Kolb, of Lille, France, Manufacturing Chemist) and in what manner the same
is to be performed, to be particularly described and ascertained in and by the
following statement, that is to say :—
This Invention has for its object to obtain the chlorides of barium and strontium
by improved processes, which yield them at less cost than that at which they are
obtained by processes hitherto in use.
In carrying out the Invention, according to one modification, natural sulphate
of baryta is used, this substance being more abundant and less costly than the
natural carbonate hitherto used; whilst for the hydrochloric acid hitherto employed
and which is becoming of increased price, chloride of calcium is employed, this
substance being a waste or residuary product in many chemical manufactures.
The sulphate of barium and chloride of calcium mixed with charcoal or other
suitable carbon and a little lime or carbonate of lime are strongly heated in a
furnace, the waste fire gases of which are by preference utilised for drying the
chloride of calcium. The resulting product consists of chloride of barium and
sulphide or oxysulphide of calcium, and by lixiviation yealds the chloride of barium
free or almost free from sulphides.
The chloride of strontium is obtained from the sulphate in a similar manner, by
furnacing it with chloride of calcium, carbon, and a little lime or carbonate of lime.
In the operation herein before described there are combined the two reactions or
processes of reducing the sulphate to sulphide by means of the carbon and the
conversion of the sulphide of barium or strontium so obtained into chloride; and
it will be obvious that these two reactions or processes may be effected separately.
Or instead of beginning with a sulphate of baryta or of strontia, a sulphide or
hydrosulphide of barium or of strontium obtained in any convenient way may be
taken and furnaced along with chloride of calcium so as to obtain the chloride of
barium or of strontium.
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
1. The obtaining of chlorides of barium and strontium by heating their
sulphates with chloride of calcium and carbon, substantially as hereinbefore
described.
2. The obtaining of chlorides of barium and strontium by beating their sulphides
or hydrosulphides with chloride of calcium, substantially as herein before described.
Dated this twenty fourth day of March 1886.