IMPROVEMENTS IN APPARATUS EMPLOYED IN SEPARATING TAR FROM AMMONIACAL LIQUOR OR OTHER FLUIDS OF DIFFERENT SPECIFIC GRAVITIES" PROVISIONAL SPECIFICATION
Year: 1882

page_text: LETTERS PATENT to John Dempster and Robert Dempster the younger of
Elland in the County of York, Gas Engineers for an "Invention of
"IMPROVEMENTS IN APPARATUS EMPLOYED IN SEPARATING TAR FROM
AMMONIACAL LIQUOR OR OTHER FLUIDS OF DIFFERENT SPECIFIC GRAVITIES"
PROVISIONAL SPECIFICATION left by the said John Dempster and Robert
Dempster at the Office of the Commissioners of Patents on the 8th July
1882.
JOHN DEMPSTER and ROBERT DEMPSTER the younger of Elland in the County of
York Gas Engineers "IMPROVEMENTS IN APPARATUS EMPLOYED IN SEPARATING
TAR FROM AMMONIACAL LIQUOR OR OTHER FLUIDS OF DIFFERENT SPECIFIC
GRAVITIES,"
This Invention has reference to the vessel employed in separating tar from
ammoniacal liquor after they get into the said vessel, the specific gravity of the
two bodies causing them to separate by the tar sinking to the bottom of the vessel
and the liquor floating on the top of the tar. The object of our Invention is to
provide for the separation of these two bodies more effectually than is the case at
present, and this we accomplish by fixing to the opening out of which the liquor
(or tar) passes a suitable shaped box having a vertical pipe screwed therein with
an overflow cup on the top which can be raised and lowered by means of the screw
to suit the height of liquor in the vessel, so that it can flow over the edge of the
cup down the screwed pipe into the box and out at the outlet.
Instead of the pipe being screwed for regulating the height of cup a gland and
screw operated by hand wheel is employed.
Instead of employing the overflow cup we divide the vessel by a division plate
and connect thereto a sliding plate moved up and down by hand wheel and screw
same as a slide valve so as to regulate the point at which the tar or liquor may
overflow.
In somes cases light tary oil passes into the vessel along with the tar and
ammoniacal liquor and in order to prevent its getting into the cup and so pass out
with the ammoniacal liquor we place a cylindrical pipe around the overflow cup
whereby placing the top of the cup out of reach of the oily tar, but an opening is
made in the division plate so that it can escape out of the same opening as the tar
or an additional opening may be made in the side of the vessel so that the three
bodies may all be separate.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said John Dempster and Robert Dempster in the Great Seal Patent
Office on the 8th January 1883.
JOHN DEMPSTER and ROBERT DEMPSTER the Younger of Elland, in the County of
York, Gas Engineers, "IMPROVEMENTS IN APPARATUS EMPLOYED IN SEPARATING
TAR FROM AMMONIACAL LIQUOR%; OR OTHER FLUIDS OF DIFFERENT SPECIFIC
GRAVITIES
"B
This Invention has reference to the vessel employed in separating tar from
ammoniacal liquor after they get into the said vessel; the specific gravity of the
two bodies causing them to separate by the tar sinking to the bottom of the
vessel, and the liquor floating on the top of the tar.
The object of our Invention is to provide for the separation of these two bodies
more effectually than is the case at present; and this we accomplish by fixing to
the opening out of which the liquor (or tar) passes a suitable shaped box having a
vertical pipe screwed therein with an overflow cup on the top which can be raised
and lowered by means of the screw to suit the height of liquor in the vessel, so
- that it can flow over the edge of the cup down the screwed pipe into the box and
out at the outlet.
In order that our Invention may be better understood, we herein give reference
to the accompanying Sheet of Drawings wherein Fig 1 is section and Fig 2 plan
of tar separating vessel having our Improvements applied thereto. A. is the vessel
provided with inlets B and C in the usual manner. D is the outlet for the tar
and E is the outlet for the ammoniacal liquor provided with a box F and cup G,
the latter of which is capable of being raised and lowered by means of the screwed
pipe H. As is well known the tar on entering the vessel immediately sinks to the
bottom whilst the liquor floats on the surface of the tar, and in order that the
liquor may freely escape without being mixed with the tar, the upper edge of the
over flow cup G is screwed to any suitable level or height above the outlet D where
the tar escapes consequently the two bodies are effectually separated, both the
liquor and the tar escaping by different outlets in a pure state.
In some cases light tary oil passes into the vessel along with the ammoniacal
liquor and tar, and in order to prevent its getting into the cup G and so pass out
with the liquor, we place a cover I (see Figures 3 and 4) around the said cup,
thereby placing the top thereof out of reach of the oily tar, whereby the liquor is
kept pure. In order however to get rid of the oily tar, we make an opening J in
the division plate K so that it will escape by the outlet D along with the tar.
We may however make another opening in the side of the vessel A for the escape
of this oily-tar, so that instead of its passing out with the tar as described it may
escape separately, in which case the three bodies would be separated.
Instead of employing the overflow cup as shown and described we divide the
vessel by a plate; and connect thereto a sliding plate moved up and down by
hand wheel and screw, same as a slide valve so as to regulate the point at which
the liquor may overflow.
"
This part of our Invention is shown in Fig. 5 which is plan of vessel. Fig 6
section thereof through line a, b whilst Fig 7 is another section through line a. d.
A is the vessel provided with inlets B and C and outlets D and E as in the
previous case. The vessel is divided by a plate F extending from the bottom as
high as the part G. This division plate is provided with brackets H for supporting
screws I-
I employed for raising and lowering the sliding plate J the height or
position of which determines the point where the ammoniacal liquor shall over-
flow. The screws I are operated by hand wheels K,

page_text: Having now shown and described our Invention, and explained the manner of
carrying it into practice, we would have it understood that we do not confine
ourselves to the exact details herein shown and described, as some of them may be
varied without departing from the main features thereof, but what we believe to
be new and therefore claim is,
The means or methods for separating tar from ammoniacal liquors, or other
liquids of different specific gravities in the manner substantially as herein shown
and described.
In witness whereof we the said John Dempster and Robert Dempster the
younger have hereunto set our hands and seals this Sixth day of January
in the year of our Lord, one thousand eight hundred and eighty three.
JOHN DEMPSTER
TARR
(L.S.)