Manufacture of a New 1, 8 Amidonaphtholdisulpho Acid from 1, 8 Naphthylendiaminetrisulpho Acid.
Year: 1894

page_text: Date of Application, 7th July, 1894
Complete Specification Left, 16th Feb., 1895-Accepted, 16th Mar., 1895
PROVISIONAL DE MULTICATION.
[Communicated from abroad by ALFRED FISCHESSER & Co., of Lutterbach,
Alsace, Germany, Chemical Manufacturers.]
Manufacture of a New 1, 8 Amidonaphtholdisulpho Acid from
1, 8 Naphthylendiaminetrisulpho Acid.
I, CHARLES DENTON ABEL, of No. 28 Southampton Buildings, Chancery Lane,
in the County of London, Consulting Engineer and Chartered Patent Agent, do
hereby declare the nature of this invention to be as follows:-
-
On boiling the aqueous solution of the acid salt of the 1,8 naphthylendiamine
trisulpho acid prepared from peridinitronaphthalin by means of an aqueous solution
of sulphites, a peculiar change takes place; a sulpho group and an amido group
are simultaneously excluded, and a 1, 8 amidonaphtholdisulpho acid is produced
which is different from those hitherto known.
For producing this acid the process may be carried out as follows:-
One part of acid 1, 8 naphthylendiamine trisulphonate of soda is boiled with
5 parts of water for 48 hours with reflux.
On the cooled liquid being allowed to stand for some time, the new amido-
naphtholdisulpho acid crystallises out in the form of the acid soda salt.
The concentration of the solution, as also the duration of the heating may vary
between wide limits without altering the result; also, in order to shorten the
duration of the reaction, the process can be carried on at a higher temperature, in
the following manner.
1 part of acid 1, 8 naphthylendiamine trisulphonate of soda is heated together
with 4 parts of water in a digester to a temperature of 120° to 130° C. for 10 hours.
The farther operations are effected as.above described. Instead of water dilute
mineral acids may be employed with the same result, as in the following example :
One part of acid 1, 8 naphthylendiamine trisulphonate of soda is boiled with
7 parts of 10 per cent. sulphuric acid for 24 hours with reflux. The farther
operations remain as before."
The acid 1, 8 amidonaphtholdisulphonate of soda thus obtained has, after drying
at 130°C a composition, corresponding to the formula

page_text: colouring matters produced therefrom by diazo compounds, and which are
distinguished by their extraordinary purity and beauty of tone.
The compound is intended for the inanufacture of azo colouring matters.
Dated this 7th day of July 1894.
ABEL & IMRAY,
Agents for the Applicant.
Manufacture of a New 1, 8 Amidonaphtholdisulpho Acid: from
1, 8 Naphthylendiaminetrisulpho Acid.
I, CHARLES DENTON ABEL of No. 28 Southampton Buildings, Chancery
Lane, in the County of London, Consulting, Engineer and Chartered Patent
Agent, 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 :-
On boiling the aqueous solution of the acid salt of the 1, 8 naphthylendiamine
trisulpho acid prepared for instance from peridinitronaphthalin by means of an
aqueous, solution, of sulphites as described in the Specification to my application
dated 6th July 1894 No. 13156, a peculiar change takes place; a sulpho group
and an amido group are simultaneously excluded, and a 1, 8 amidonaphtholdisulpho
acid is produced which is different from those hitherto known.
For producing this acid the process may be carried out as follows:-
One part of acid 1, 8 naphthylendiamine trisulphonate of soda is boiled with
5 parts of water for 48 hours with reflux.
On the cooled liquid being allowed to stand for some time, the new amido-
naphtholdisulpho acid crystallises out in the form of the acid soda sult.
The concentration of the solution, as also the duration of the heating may vary
between wide limits without altering the result; also, in order to shorten the
duration of the reaction; the process can be carried on at a higher temperature, in
the following manner.
1 part of acid. 1, 8 naphthylendiamine trisulphonate of soda is heated together
with 4 parts of water in a digester to a temperature of 120° to 130° C. for 10 hours.
The farther operations are effected as above described. Instead of water dilute
mineral acids may be employed with the same result, as in the following example:
One part of acid 1, 8 naphthylendiamine trisulphonate of soda is boiled with
7 parts of 10 per cent. sulphuric acid for 24 hours with reflux. The farther
operations remain as before.
The acid 1, 8 amidonaphtholdisulphonate of soda thus obtained has, after drying
at 130° C. a composition, corresponding to the formula

page_text: colouring matters produced therefrom by diazo compounds, and which are
listinguished by their extraordinary purity and beauty of tone.
The compound is intended for the manufacture of azo colouring matters.
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 :-
Manufacture of a new 1, 8 amidonaphtholdisulpho acid by heating the acid salts
of the 1,8 naphthylendiaminetrisulpho acid described in Application No. 13156
of 1894 with water or dilute mineral acids, substantially as described.
ABEL & IMRAY,
Agents for the Applicant.
ABEL & IMRAY,
Agents for the Applicant.