Improvements in or appertaining to Apparatus for Drying Bicarbonate of Soda.
Year: 1893

page_text: Date of Application, 12th Dec., 1893
Complete Specification Left, 11th Oct., 1894-Accepted, 17th Nov., 1894
PROVISIONAL SPECIFICATION.
Improvements in or appertaining to Apparatus for Drying
Bicarbonate of Soda.
I, GUSTAV JÁRMAY of Winnington in the County of Chester, Manufacturing
Chemist, do hereby declare the nature of this invention to be as follows:-
The drying of bicarbonate of soda is a peculiarly delicate operation, as this
substance decomposes at a low temperature.
In order to carry out the drying of bicarbonate in an expeditious manner, I pass
it through a long trough, covered with a tight fitting lid, through which it is
transported by means of paddles, fixed to a shaft running inside for the whole
length of the trough.
In the same direction in which the bicarbonate travels, I pass hot air through this
trough which has been raised to a temperature of about 95 degrees centigrade, by
means of a suitable heating apparatus, preferably by steam in an apparatus of the
multitubular type.
The air is drawn or forced through this trough at a considerable speed by means
of a fan, and is passed through a dust-chamber or cyclone, and subsequently is
filtered through long bags or hoses made of jute or canvas or other suitable material
to retain all the fine dust which it carries with it.
It is advantageous to mix carbonic acid with the air, and in proportion to the
amount of the carbonic acid put in, it becomes possible to raise the temperature of
the air higher without fear of decomposition, and to obtain a more highly
carbonated product. The bicarbonate is fed in at one end of this trough by a
mechanical feeding arrangement, which delivers it in regular quantities, while
forming a sufficiently hermetic lute, so as neither to allow air to enter into or to
escape from the trough, and it falls at the other end of the trough into a discharging
screw so constructed that it also forms a hermetic seal.
I found it essential to pass the bicarbonate and hot air in the same direction
through the trough, as, otherwise, the cold bicarbonate fed in condenses water from
the air already charged with it.
Dated this 9th day of December 1893.
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool, Patent Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in or appertaining to Apparatus for Drying
Bicarbonate of Soda.
I, GUSTAV JARMAY, of Winnington, in the County of Chester, Manufacturing
Chemist, do hereby declare the nature of this invention and in what manner the
same is to be performed, to be particularly described and ascertained in and by the
following statement:―
The drying of bicarbonate of soda is a peculiarly delicate operation, as this
substance decomposes at a low temperature.
I pass
In order to carry out the drying of bicarbonate in an expeditious manner,
it through a long trough, covered with a tight fitting lid, through which it is
transported by means of paddles, fixed to a shaft running inside for the whole

page_text: length of the trough. In the same direction in which the bicarbonate travels, I
pass hot air through this trough which has been raised to a temperature of about
95 degrees centigrade, by means of a suitable heating apparatus, preferably by
steam in an apparatus of the multitubular type. The air is drawn or forced
through this trough at a considerable speed by means of a fan or its substitute and
is passed through a dust chamber or cyclone, and subsequently is filtered through
long dust bags or hoses made of jute or canvas or other suitable material to retain
all the fine dust which it carries with it. It is advantageous to mix carbonic acid
with the air, and in proportion to the amount of carbonic acid put in, it becomes
possible to raise the temperature of the air higher without fear of decomposition,
and to obtain a more highly carbonated product. The bicarbonate is fed in at one
end of this trough by a mechanical feeding arrangement, which delivers it in
regular quantities, while forming a sufficiently hermetic lute, so as neither to allow
air to enter into or to escape from the trough, and it falls at the other end of the
trough into a discharging door or screw so constructed that it also forms a
hermetic seal.
In the accompanying drawing which shows a sectional elevation of the apparatus
for drying bicarbonate of soda, A is the feeder for bicarbonate, A¹ the trough
covered with a tight fitting lid, B pipe for hot air, C transporting screw or paddles,
D the discharge for dried bicarbonate, E the exhaust fan for drawing hot air
through the trough, F dust settling box or cyclone and G dust bag or hose.
I have found it essential to pass the bicarbonate and hot air in the same
direction through the trough, as, otherwise, the cold bicarbonate fed in condenses
water from the air already charged with it, thereby becoming pasty and clogging
the apparatus.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is―
1. The combination, for the purpose of drying bicarbonate of soda, of a long
trough provided with paddles for transporting the bicarbonate through it with a
mechanical feeder at one end, and a discharging arrangement at the other end, both
so constructed as to form a hermetic seal and with means for drawing a current of
hot air through the said trough and a dust chamber or other suitable dust
separating device to collect fine bicarbonate dust carried along by the air current
substantially as described.
2. The process of drying bicarbonate of soda, which consists in causing it to
travel through a suitable apparatus in a continuous stream along with a current of
hot air, preferably mixed with a certain amount of carbonic acid in such manner as
to be largely exposed to that air, both air and bicarbonate moving in the same
direction.
Dated this 10th day of October 1894.
WM. P. THOMPSON & Co.,
Of Liverpool, Manchester, Birtningham, Nottingham, and London,
Patent Agents.