Improvement in the Manufacture of Sulphur Trioxide (Sulphuric Anhydride).
Year: 1899

page_text: Date of Application, 5th Jan., 1899
Complete Specification Left, 20th Sept., 1899-Accepted, 21st Oct., 1899
PROTIVNAL DREIFICATION
Improvement in the Manufacture of Sulphur Trioxide (Sulphuric
Anhydride).
I, OLIVER IMRAY, of Birkbeck Bank Chambers, Southampton Buildings, in
the County of London, Chartered Patent Agent, do hereby declare the nature
of this invention (as communicated to me from abroad by The Farbwerke vormals
Meister Lucius and Brüning, of Hoechst a/Main, in the Empire of Germany,
Chemical Manufacturers,) to be as follows: -
It is known, that in the manufacture of sulphur trioxide (sulphuric anhydride)
by the contact process, especially if the SO, gases to be treated are of great
concentration, so high a temperature of the reaction gases is produced, that, on the
one hand, the apparatus and the contact become damaged and in the course of
time are thus rendered useless, whilst on the other hand a reproduction of SO, is
liable to take place by the dissociation of SO,.
My foreign correspondents have found a method which permits within certain
limits exact regulation of the temperature of the gases in the contact chamber,
thus avoiding the above mentioned objections and permitting the employment
simultaneously of the heat of reaction evolved in the manufacture of sulphurio
anhydride.
For this purpose cold currents of gases containing SO₂, capable of being
regulated, are directed at different places into the contact chamber and are mixed
with the hot reaction gases, the temperature of which can thus be lowered to any
extent desired and a uniform heat advantageous for the process can be obtained.
The process is illustrated by the following example and accompanying drawing.
In the contact chamber K, the contacts c clc, care arranged in successive
floors. The gases containing SO, previously heated to the reaction temperature
enter the chamber at E and pass through the contact body placed on the
first floor. An oxidation of part of the SO, into SO, takes place, and the heat
of reaction thus evolved raises the temperature of the reaction gases. From
pipes R by means of a regulator valve cold SO, gas is allowed to enter the
contact chamber at r and to mix with the hot gases, by means of an appropriate
distributer in such quantities that the gas mixture thus obtained has a temperature
approaching that originally existing at E.
On each successive contact floor (c, c, c³ &c) the above described process is
repeated and the action can be closely watched by the heat indicators TT¹ T* &c.
and exactly regulated by the valves &c. The process in the upper compart-
ments is to be conducted in such a manner, that the gases leaving the contact
chamber at A are of a sufficiently high temperature to be utilised for heating
the 80, gases entering at E.
It is easily possible by this method to maintain throughout the contact chamber
and during the whole of the process a temperature favourable to the reaction,
which, however, is not confined within very close limits, and thus on the one hand
a thorough conversion of SO, into SO, is obtained, avoiding injurious overheating

page_text: of the contact and apparatus, whilst on the other hand not only is injurious excess
of heat in the contact chamber prevented, but the heat evolved can be utilised
in the conversion of further SO, gases into 80g.
Dani thin cah
T
1000
ABEL & IMRAY,
Agents for the Applicant.
Improvement in the Manufacture of Sulphur Trioxide (Sulphuric
Anhydride).
I, OLIVER INRAY, of Birkbeck Bank Chambers, Southampton Buildings, in
the County of London, Chartered Patent Agent, do hereby declare the nature
of this invention (as communicated to me from abroad by The Farbwerke vormals
Meister Lucius and Brüning, of Hoechst a/Main, in the Empire of Germany,
Chemical Manufacturers) and in what manner the same is to be performed to be
particularly described and ascertained in and by the following statement:-
It is known, that in the manufacture of sulphur trioxide (sulphuric anhydride)
by the contact process, especially if the SO, gases to be treated are of great
concentration so high a temperature of the reaction gases is produced, that, on the
one hand, the apparatus and the contact become damaged and in the course of
time are thus rendered useless, whilst on the other hand a reproduction of SO, is
liable to take place by the dissociation of SO..
My foreign correspondents have found a method which permits within certain
limits exact regulation of the temperature of the gases in the contact chamber,
thus avoiding the above mentioned objections and permitting the employment
simultaneously of the heat of reaction evolved in the manufacture of sulphuric
anhydride.
For this purpose cold currents of gases containing SO,, capable of being
regulated, are directed at different places into the contact chamber and are mixed
with the hot reaction gases, the temperature of which can thus be lowered to any
extent desired and a uniform heat advantageous for the process can be obtained.
The process is illustrated by the following example and the drawing accompany-
ing my Provisional Specification.
In the contact chamber K, the contacts calc³ ³ are arranged in successive
floors. The gases containing 80, previously heated to the reaction temperature
enter the chamber at E and pass through the contact body c placed on the
first floor. An oxidation of part of the SU, into SO, takes place, and the heat
of reaction thus evolved raises the temperature of the reaction gases. From
pipes R by means of a regulator valve cold SO, gas is allowed to enter the
contact chamber at r and to mix with the hot gases, by means of an appropriate
distributer in such quantities that the gas mixture thus obtained has a temperature
approaching that originally existing at E.
On each successive contact floor (c, c³, e³ &c) the above described process is
repeated and the action can be closely watched by the heat indicators TT T³ &c.
and exactly regulated by the valves &c. The process in the upper compart-
ments is to be conducted in such a manner, that the gases leaving the contact
chamber at A are of a sufficiently high temperature to be utilised for heating
the SO, gases entering at E.
It is easily possible by this method to maintain throughout the contact chamber
and during the whole of the process a temperature favourable to the reaction,
which, however, is not confined within very close limits, and thus on the one hand

page_text: a thorough conversion of 80, into SO, is obtained, avoiding injurious overheating
of the contact and apparatus, whilst on the other hand not only is injurious excess
of heat in the contact chamber prevented, but the heat evolved can be utilised
in the conversion of further SO, gases into SO..
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what
I claim is:-
In the manufacture of sulphuric anhydride by the contact process, regulating
the temperature in the contact chamber by mixing the reaction gases therein
with cold gases, substantially as described.
Dated this LL
1000
ABEL & IMRAY,
Agents for the Applicant.