Improved Means for use in the Manufacture or Production of Sulphurous Acid and Sulphites.
Year: 1893

page_text: Date of Application, 5th May, 1893
Complete Specification Left, 11th Sept., 1893-Accepted, 14th Oct., 1893
PROVISIONAL SPECIFICATION.
Improved Means for use in the Manufacture or Production of
Sulphurous Acid and Sulphites.
I MANNING PRENTICE of Woodfield Stowmarket in the County of Suffolk
Manufacturing Chemist do hereby declare the nature of this invention to be as
follows:-
The object of my invention is to provide means whereby the manufacturé, or
production, of sulphurous acid and sulphites is facilitated and economy in the
manufacture, or production, effected.
In the production of sulphurous acid and of sulphites such as bi-sulphite of lime,
and sulphite of soda, or potash, for example it is customary to employ sulphuric
acid and to decompose it for the production of sulphurous acid gas for use in the
manufacture of the sulphites. According to my invention employ sulphur in
place of sulphuric acid and by burning the sulphur in the presence of atmospheric
air, or of oxygen, I produce sulphurous acid gas.
The gases are drawn off by a pump, or fan, or equivalent device, and by the said
pump, fan, or device, the gases are forced into water or other liquid which it is
desired to impregnate with sulphurous acid gas or into the liquid containing the
hydrate, carbonate, or other suitable compound of the base, or bases, which is, or
are, to be subjected to the action of the sulphurous acid gas for the production of
sulphites or passed through a chamber where the salts or substances to he actedł
upon by the sulphurous acid gas are contained being placed on shelves or in such
other manner as may be most conducive to the action desired.
In this way I can economically and with great facility produce sulphurous acid of
commerce, and sulphites, such for example, as bi-sulphite of lime, mono-sulphite of
soda, of potash, or of lime and the like. The solutions produced can be treated in
any customary or suitable manner and where necessary evaporated so as to separate
the valuable constituents by crystallisation.
By forcing the gases through a series of two or more vessels the pressure in the
earlier vessels of the series is naturally increased and such pressure facilitates the
absorption of the sulphurous acid gas by the water or other liquid or substance.
Dated this 5th day of May 1893.
J. H. JOHNSON & Co.,
47, Lincoln's Inn Fields, London, W.C., Agents.
COMPLETE SPECIFICATION.
Improved Means for use in the Manufacture or Production of
Sulphurous Acid and Sulphites.
I MANNING PRENTICE of Woodfield Stowmarket in the County of Suffolk
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 object of my invention is to provide means whereby the manufacture, or
production of sulphurous acid and sulphites is facilitated and economy in the
manufacture, or production effected.
In the production of sulphurous acid and of sulphites such as bi-sulphite of lime,
and sulphite of soda, or potash, for example, it is customary to employ sulphuric
acid and to decompose it for the production of sulphurous acid gas for use in the
manufacture of the sulphites. According to my invention I employ sulphur in

page_text: •
place of sulphuric acid and by burning the sulphur in the presence of atmospheric
air, or of oxygen I produce sulphurous acid gas.
The gases or fumes are drawn off by a pump, or fau, or equivalent device, and by
the said pump, fan, or device, the gases are forced into water or other liquid which
it is desired to impregnate with sulphurous acid gas or into the liquid containing
the hydrate, carbonate, or other suitable compound of the base, or bases, which is,
or are, to be subjected to the action of the sulphurous acid gas for the production of
sulphites or passed through a chamber where the salts or substances to be acted
upon by the sulphurous acid gas are contained on shelves cr in such other manner
as may be most conducive to the action desired.
In this way I can economically and with great facility produce sulphurous acid
of commerce, and sulphites, such for example, as bi-sulphite of lime, mono-sulphite
of soda, of potash, or of lime, and the like. The solutions produced can be treated
in any customary or suitable manner and where necessary evaporated so as to
separate the valuable constituents by crystallisation.
By forcing the gases through a series of two or more vessels the pressure in the
earlier vessels of the series is naturally increased and such pressure facilitates the
absorption of the sulphurous acid gas by the water or other liquid or substance.
The accompanying drawing represents in diagrammatic form an arrangement of
apparatus for carrying my invention into effect. A. is a chamber in which sulphur
is burnt in the presence of air or oxygen admitted by a pipe or an opening for
instance by raising a door as at a. a is the outlet from the said chamber leading
to the fan B, which is rotated in a direction to draw the fumes from the chamber A
and discharge them into the outlet band force them therealong to a chamber or
chambers or vessel or vessels (shewn at D) in which is contained the water which
is to be impregnated with the sulphurous acid gas or containing the salts or
substances or the liquid containing the hydrate carbonate or other suitable
compound of a base or of bases which are or is to be treated with the sulphurous
acid gas for the production of the sulphite or sulphites desired. In place of a fan
I may use a pump or other suitable forcing device.
It is desirable that the gases be cooled and purified before they enter the fan
and for effecting this I have shewn the cooler and purifier C through which the
gases pass from the outlet a² to the fan B.
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
―
In the manufacture of sulphurous acid or sulphites or both the combination with
a chamber in which sulphur is burnt in the presence of atmospheric air or of
oxygen a pump fan or other forcing device by which the fumes or gases produced
by the burning of the sulphur are drawn off and forced into chambers or vessels
containing the water or substances or matters to be treated with sulphurous acid
gas substantially as herein before described.
Dated this 11th day of September 1893.