Improvements in Evaporating Brine and other Liquors and Apparatus therefor.
Year: 1893

page_text: Date of Application, 29th June, 1893
Complete Specification Left, 29th Mar., 1894-Accepted, 5th May, 1894
Improvements in Evaporating Brine and other Liquors and Apparatus
therefor.
We, FRANK WALTER SCOTT, of 44, Christian Street, Commercial Road, in
the County of London, Engineer, ERNEST GEORGE SCOTT, of 67, Lord Street,
Liverpool, in the County of Lancaster, Consulting Chemist, and FRANK
WALTER SCOTT, Junior, of 44, Christian Street aforesaid, Engineer, do hereby
declare the nature of this invention to be as follows:-
Our invention relates to the evaporation of brine and other liquids in vacuo.
The apparatus hitherto generally used for effecting such evaporation has had the
heating system contained within the evaporating vessel and it is found that with
certain liquors and under certain conditions the crystals deposit upon the tubes of
the heating system and so impair the efficiency of the same.
The object of our invention is to prevent this deposit upon the heating tubes and
we effect this by heating the liquid to be treated to the required temperature before
introducing it into the evaporating vessel (thereby dispensing with the usual
heating system in the vessel) so that, when the liquid does enter the said vessel and
come under the influence of the vacuum therein it will immediately vapourize,
crystallizable matter which it contains being deposited upon the bottom of the
vessel.
In carrying out our invention we employ an evaporating vessel of any ordinary
or desirable shape but without the system of heating tubes and in a second vessel
we place a system of heating tubes adapted to be heated by steam in the usual
manner.
The liquid to be evaporated is circulated through the heating vessel by a pump
or other feeding device and after being heated is discharged therefrom into the
evaporating vessel the discharge opening being so proportioned to the feeding
device that the liquid will always escape from the heating vessel to the evaporating
vessel under pressure whereby any vapourization in the heating vessel is avoided.
When our invention is applied to apparatus working with multiple effect each
evaporating vessel is provided with a heating vessel which is heated by the steam
escaping from the preceding evaporating vessel.
Dated the 29th day of June 1893.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicants.
Improvements in Evaporating Brine and other Liquors and Apparatus
therefor.
We, FRANK WALTER SCOTT, of 44, Christian Street, Commercial Road, in
the County of London, Engineer, ERNEST GEORGE SCOTT, of 67, Lord Street,
Liverpool, in the County of Lancaster, Consulting Chemist, and FRANK
WALTER SCOTT, Junior, of 44, Christian Street aforesaid, Engineer, do hereby
declare the nature of this invention and in what manner the same is to,
[Price 8d1
be

page_text: performed, to be particularly described and ascertained in and by the following
statement:-
Our invention relates to the evaporation of brine and other liquids in vacuo.
The apparatus hitherto generally used for effecting such evaporation has had the
heating system contained within the evaporating vessel and it is found that with
certain liquors and under certain conditions the crystals deposit upon the tubes of
the heating system and so impair the efficiency of the same.
The object of our invention is to prevent this deposit upon the heating tubes
and we effect this by heating the liquid to be treated to the required temperature
before introducing it into the evaporating vessel (thereby dispensing with the usual
heating system in the vessel) so that when the liquid does enter the said vessel and
come under the influence of the vacuum therein it will immediately vaporize,
crystallizable matter which it contains being deposited upon the bottom of the
.vessel.
In carrying out our invention we employ an evaporating vessel of any ordinary
or desirable shape but without the system of heating tubes and in a second vessel
we place a system of heating tubes adapted to be heated by steam in the usual
manner.
The liquid to be evaporated is circulated through the heating vessel by a pump
or other feeding device and after being heated is discharged therefrom into the
evaporating vessel, the discharge being so proportioned to the feed that the
liquid will always escape from the heating vessel to the evaporating vessel under
pressure.
To enable our invention to be fully understood we will describe the same by
reference to the accompanying drawings, in which :-
.
Figure 1 is a vertical section of an evaporating apparatus constructed according
to our invention; and,
Figure 2 is an elevation shewing several sets of such apparatus arranged for
multiple, effect.
a is the evaporating vessel proper which as shewn in the drawings is of ordinary
construction, except that it has no internal system. of heating tubes, and 6 is the.
heating vessel having extending through it a series of heating tubes c, c through
which the liquid to be heated is circulated, such liquid being introduced at the
bottom, of the vessel b through the pipe by means of a suitable pump and
discharged therefrom through the pipe e whence it flows into the vessel a through
the tube f g is the inlet for the steam for heating the vessel b, and h is a pipe
communicating with the steam space between the circulating tubes c, c and with
the jacket surrounding the lower part of the vessel a, the said pipe h serving to
carry off the water of condensation from the vessel b to the said jacket whence it
escapes through the pipe . j is a valve which is seated upon the top of the
discharge pipe e of the heating vessel 6 and which is acted upon by a spring k the
pressure of which is proportionate to the pressure which it is desired to maintain
in the said heating vessel b.
With the arrangement herein before described it will be understood that the
liquid in the heating vessel b being constantly full and under pressure no
vaporization can take place therein so that no crystallizable matter will be
deposited upon the tubes c, c, the deposit taking place in the vessel a.
7 is a pipe through which the liquid may be drawn from the evaporating vessel a
by the pump and returned to the heating vessel 6 in order that it may be
concentrated in the said vessel a to the required extent, and to prevent the
crystallized matter from being returned to the heating vessel by the pump we
provide the evaporating vessel with a discharge valve m of the kind described in
the Specification of former Letters Patent granted to us No. 6478 of 1892,
whereby the crystals are removed from time to time as they deposit.
The arrangement of a series of vessels for multiple effect will be readily
understood by reference to Figure 2, where it will be noticed that the heating

page_text: ressel 6 belonging to each evaporating vessel a except the first one is heated by
the steam escaping from the preceding evaporating vessel a through the pipe n.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
1. The improvements in evaporating brine and other liquors consisting in heating
such liquors in a vessel independent of the evaporating vessel proper and then
introducing such heated liquids into the evaporating vessel, substantially as
described.
2. The combination with an evaporating vessel without an internal system of
heating tubes of a second vessel provided with a system of heating tubes and
adapted to discharge the heated liquor therefrom into the evaporating vessel, the
liquor filling such heating vessel and being maintained under pressure in order that
no evaporation shall take place therein, substantially as described.
3. The manufacture and use of the improved evaporating apparatus hereinbefore
described and illustrated in the accompanying drawings.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicants.