Improvements in the Preparation of Para-di-oxy-thiazine and Paramidoxy Thiazine.
Year: 1897

page_text: Date of Application, 3rd Mar., 1897
Complete Specification Left, 3rd Dec., 1897-Accepted, 8th Jan., 1898
.
Improvements in the Preparation of Para-di-oxy-thiazine and
Paramidoxy Thiazine.
I, HENRI RAYMOND VIDAL, of 95 Boulevard Beaumarchais, Paris, in the
Republic of France, Chemical Engineer, do hereby declare the nature of this
invention to be as follows:-
In heating paramido-phenol with sulphur, a liberation of ammonia is produced
which intervenes in the operation by reacting upon the para-di-oxy-thiazine formed
in order to condense it, molecule by molecule, and give para-di-oxy-tetra-phene-
tri-thiazine. In this reaction it is not possible to isolate more than very small
quantities of para-di-oxy-thiazine.
I have found that by causing sulphur to react upon equal parts of paramido-
phenol and hydroquinone, the ammonia liberated by the action of the sulphur
upon the paramido-phenol, exerted in presence of the sulphur its action upon the
hydroquinone so as to give para-di-oxy-thiazine upon its own account also. It
was thus no longer able to react upon the para-di-oxythiazine formed by the
paramido-phenol in order to condense it into para-di-oxy-tetra-phene-tri-thiazine.
The product of the reaction is constituted almost entirely by the para-di-oxy-
thiazine.
I heat, for example, in an iron cauldron provided with an agitator
Paramido-phenol
Hydroquinone
Sulphur
11 kilos
11
3
"
دو
200 grammes
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicant.
Improvements in the Preparation of Para-di-oxy-thiazine and
Paramidoxy Thiazine.
I, HENRI RAYMOND VIDAL, of 95 Boulevard Beaumarchais, Paris, in the
Republic of France, Chemical Engineer, do hereby declare the nature of this
[Price 8d.1

page_text: invention and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement:-
-
In heating paramido-phenol with sulphur, a liberation of ammonia is produced
which intervenes in the operation by reacting upon the para-di-oxy-thiazine formed
in order to condense it, molecule by molecule, and give para-di-oxy-tetra-phene-
tri-thiazine. In this reaction it is not possible to isolate more than very small
quantities of para-di-oxy-thiazine.
!
I have found that by causing sulphur to react upon equal parts of paramido-
phenol and hydroquinone, the ammonia liberated by the action of the sulphur
upon the paramido-phenol, exerted in presence of the sulphur its action upon the
hydroquinone so as to give para-di-oxy-thiazine unon its own account also. It
was thus no longer able to react upon the para-di-oxythiazine formed by the
paramido-phenol in order to condense it into para-di-oxy-tetra-phene-tri-thiazine.
The product of the reaction is constituted almost entirely by the para-di-oxy-
thiazine.
I heat, for example, in an iron cauldron provided with an agitator
Paramido-phenol
Hydroquinone
Sulphur
11 kilos
11
داد
3 200 grammes
وو
The solidification of the mass indicates, by the stoppage of the agitator, that
the reaction is terminated.
The product is purified by dissolution in carbonate of soda. It is almost
entirely constituted by para-di-oxy-thiazine.
"
In order to obtain under the same conditions paramidoxy-thiazine, I cause
the sulphur to react upon a mixture of equal parts of paramido-phenol; para-
phenylene-diamine and hydroquinone.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that, what
I claim is :
"'
1. A method of manufacturing paradioxythiazine consisting in, causing sulphur
in the heated state to act upon equal parts of paramidophenol and hydroquinone.
2. A method of manufacturing paradioxythiazine, consisting in causing sulphur
in the heated state to act upon equal parts of paramidophenol and hydroquinone
and in purifying the obtained product by dissolving the same in carbonate of
soda.
3. In the method ascertained in the first claim the union with the paramido-
phenol and the hydroquinone; of paraphenylenediamine, with the object to
obtain paramido-paraoxythiazine under the same conditions.
Dated this 3rd day of December 1897.
HASELTINE, LAKE & Co.;
45 Southampton Buildings, London, W.C., Agents for the Applicant.