Improvements in the Production of Coloring Matters.
Year: 1885

page_text: Improvements in the Production of Coloring Matters.
I WILLIAM CLARK of the firm of A. M. and W Clark of 53 Chancery Lane
in the County of Middlesex, Fellow of the Institute of Patent Agents, do hereby
declare the nature of the said Invention for "IMPROVEMENTS IN THE PRODUCTION
OF COLORING MATTERS a communication to me from abroad by the Farbfabrik
vorm Brönner of Frankfort on the Main in the Empire of Germany through their
Agents, Wirth and Company also of Frankfort, aforesaid, to be as follows:-
"
This Invention relates to a process for the manufacture of Archil-red azo-dyeing
substances, and consists in combining the B naphthylaminmonosulpho-acids obtained
according to Claim 1 of former Letters Patent, No 3724 of 1882, with para-
diazonitrobenzol.
If a solution of a salt of para-diazonitrobenzol be allowed to act on the alkaline
or acetic acid solution of one of the B naphthylamin sulpho-acids manufactured
according to the Invention described in the specification of the above mentioned
Patent, an azo-coloring matter will be produced dyeing similarly to archil.
The process of manufacture is as follows:-
13.8 kilogrammes of para-nitraniline are dissolved in 1500 litres of water and
50 kilos of 20% hydrochloric acid and converted into the diazo compound by the
addition of 28 kilos of a 25% sodium nitrite solution. This is run into a solution
of 245 kilos of ẞ naphthylaminsulphonate of sodium and 30 kilos acetate of soda
dissolved in 500 litres of water. The solution is then stirred for a few hours
during which the formation of the coloring matter takes place. This is allowed
to stand for 24 hours and is then neutralised with soda heated to 80° and salted
out with a hot solution of common salt. The colouring matter is now filtered off,
pressed and dried..

page_text: I, WILLIAM CLARK, of the firm of A. M. and Wm. Clark, of 53, Chancery Lane,
in the County of Middlesex, Fellow of the Institute of Patent Agents, do hereby
declare the nature of this Invention (a communication to me from abroad by
the Farbfabrik vorm Brönner of Frankfort on the Main in the Empire of Germany
(through their agents Wirth and Company also of Frankfort aforesaid) and in
what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement:-
The present process relates to the process described in the Specification of Letters
Patent No 3724 of 1882 inasmuch as it involves the use of the Betanaphthylamin
sulpho acids which are protected by the said Patent and which are obtained
by treating naphtholsulpho acid salts by means of ammonia at an elevated
temperature..
The new coloring matters which are the object of the present Patent are
obtained as follows;-If a solution of a salt of para diazo nitrobenzol be allowed to
act on the alkaline or acetic acid solution of one of the ẞ naphthylaminsulpho acids
manufactured according to the Invention described in the Specification of the
above mentioned Patent, an azo-coloring matter will be produced dyeing similarly
to archil.
The process of manufacture is as follows;-13.8 kilogrammes of para nitraniline
are dissolved in 1500 litres of water and 50 kilos of 20 per cent hydrochloric acid,
and converted into the diazo-compound by the addition of 28 kilos of a 25% sodium
nitrite solution. This is run into a solution of 24-5 kilos of ẞ naphthylamin-
sulphonate of sodium and 30 kilos acetate of soda dissolved in 500 litres of water.
The solution is then stirred for a few hours, during which the formation of the
coloring matter takes place. This is allowed to stand for 24 hours, and is then
neutralized with soda heated to 80°, and salted out with a hot solution of common
salt. The coloring matter is now filtered off, pressed, and dried.
Having now particularly described: and ascertained the nature of the said
Invention and in what manner the same is to be performed I declare that what
I claim is ;-
The above described process for the manufacture of archil-red aro-coloring
matters, which process consists in the combination of the 3 naphthylamin-mono-
sulpho acids obtained according to Claim 1 of former Letters Patent N° 3724 of
1882 with para-diazo-nitro-benzol.