IMPROVEMENTS IN THE to be as MANUFACTURE OF RED AZO DYE STUFFS OR COLOURING MATTERS follows:-
Year: 1884

page_text: PROVISIONAL SPECIFICATION.
I, FRANCIS GAESS of Brögeler Strasse Barmen in the Kingdom of Prussia.
chemist to the firm of Dahl and Company in Barmen in the Kingdom of Prussia
do hereby declare the nature of my said Invention for "IMPROVEMENTS IN THE
to be as
MANUFACTURE OF RED AZO DYE STUFFS OR COLOURING MATTERS
follows:-
"
When Beta-naphtylamine is treated with fuming sulphuric acid according to the
method given by Dr Elscesser or with English sulphuric acid according to the
method given by the Badischen Aniline and Soda Fabrik in Ludwigshafen af Rhein
a mixture of three different mono-sulpho acids of Beta-Naphtylamine is obtained
as discovered by Dr Elsesser (see English Provisional Specification N° 7712 dated
14th May 1884 entitled "Improvements in the manufacture of several mono sulpho
acids of Beta-naphtylamine") and from which mixture the three analogous mono-
sulpho acids of Beta-naphtylamine can be separated out by Dr Elsoesser's method.
Certain azo-dye stuffs which are produced from these analogous mono-sulpho
acids of Beta-naphtylamine (obtained by Dr Elsossser's method) can also be obtained
as I have discovered from the dye stuffs which are produced by the direct action of
the Diazo-compounds of the mixture of the Beta-naphtylamine-mono-sulpho acids
on certain naphtol-sulpho acids.
Such are more particularly those dye-stuffs derived from the Alpha-naphtol-
mono-sulpho acids which acids are obtained according to known methods from the
Diazo compounds of Piria's Naphtion acid (see Liebig's Annalen der chemie Bd
78 pag: 31) and from the diazo-compounds of Laurents sulpho naphtalidam acid
(see Cpt rend. des trav. de chim. par Laurent et Gerhardt 1849 pag. 390 and
Cleve Bl d.l. ss.o chqe 24 pag 511).
My method of separation is based upon the facts that the azo dye-stuffs obtained
from the Beta-naphtylamine-mono-sulpho acid I described by Dr Elscesser (see the
above mentioned provisional Specification N° 7712-1884) and the above just
mentioned alpha-naphtolmono sulpho acids, are with more difficulty soluble in
water than those obtained from the acid III so that the former separate out from
the solution of the dye stuff by themselves, or on the addition of a little salt-
whilst the dye stuffs from the acid III remain in solution, and are first precipitated

page_text: on the addition of a considerable quantity of salt. The dyes in question are
produced by the action of the diazo compound of the Beta-naphthylamine-mono-
sulpho acid I upon the above-named alpha-naphtol-monosulpho acids.
The best method of proceeding is as follows:-
The dye stuff liquor which is obtained by the action on-the alpha-Naphtol
mono-sulpho acid of Piria's naphtion acid,-of the diazo compounds of the mixture
of the Beta-naphtylamine-mono-sulpho acids directly obtained according to
Dr Elscesser s method by acting on Beta-naphtylamine with sulphuric acid (or
according to the method given by the Badischen Anilin und Soda Fabrik) and which
liquor contains about 60 kilogrammes of dye stuff in 1000 Litres of water, is
allowed to stand two hours and then filtered.
The residue consists of the dye stuff of the Beta-naphtylamine-mono-sulpho
acid I.
Common Salt is gradually added to the filtrate until a test solution or filtrate
only gives a precipitate after standing some time; (about 100 to 120 kilogrammes
per 1000 litres of liquor are sufficient); whereby the dye stuff of the Beta
Naphtylamine-mono-sulpho acid III is obtained as a precipitate.
The dye stuffs are purified in the usual manner by redissolving.
In order to precipitate the dye stuff of the Beta-naphtylamine-mono-sulpho
acid I about 25 kilogrammes of salt are added to about 1000 litres of the liquor of
the dye stuffs of the alpha naphtol mono-sulpho acid from Laurents sulpho-
naphtalidam acid; the dye stuffs of the acid III are then separated out from the
filtrate in the manner above described.

page_text: COMPLETE SPECIFICATION.
I, FRANCIS GAESS of Brögler Strasse Barmen in the Kingdom of Prussia Chemist
to the firm of Dahl and Company in Barmen in the Kingdom of Prussia do hereby
declare the nature of my said Invention for "IMPROVEMENTS IN THE MANUFACTURE
OF RED AZO DYE STUFFS OR COLORING MATTERS and in what manner the same
is to be performed to be particularly described and ascertained in, and' by the
following statement:-/
"
.
When Beta-naphtylamine is treated with fuming sulphuric acid according to the
method given by Dr Elscesser or with English sulphuric acid according to the
method given by the Badischen Aniline and Soda Fabrik in Ludwigshafen af
Rhein a mixture of three different mono-sulpho acids of Beta-Naphtylamine is
obtained as discovered by Dr Elscesser (see English Provisional Specification
No 7712 dated 14th May 1884 entitled "Improvements in the manufacture of
several mono sulpho acids of Beta-naphtylamine") and from which mixture the
three analogous mono-sulpho acids of Beta-naphtylamine can be separated out by
Dr Elscesser's method.
Certain azo-dye stuffs which are produced from these analogous mono-sulpho
acids of Beta-naphtylamine (obtained by Dr Elscesser's method) can also be obtained
as I have discovered from the dye stuffs which are produced by the direct action of
the Diazo-compounds of the mixture of the Beta-naphtylamine-mono-sulpho acids
on certain naphtol sulpho acids.
Such are more particularly those dye-stuffs derived from the Alpha-naphtol-mono-
sulpho acids which acids are obtained according to known methods from the Diazo
compounds of Pirias Naphtion acid (see Liebigs Annalen der chemie Bd 78 page 31)
and from the diazo-compounds of Laurents sulpho naphtalidam acid (see Cpt rend.
des. trav. de. chim. par Laurent et Gerhardt 1849 pag. 390 and Cleve Bl d.l. s.s.e
chqe 24 pag 511).
My method of separation is based upon the facts that the azo dye stuffs obtained
from the Beta-naphtylamine-mono-sulpho acid I described by Dr Elsesser (see the
above mentioned provisional Specification No 7712-1884) and the above just
mentioned alpha-naphtolmono sulpho acids are with more difficulty soluble in
water than those obtained from the acid III so that the former separate out from
the solution of the dye stuff by themselves, or on the addition of a little salt-
whilst the dye stuffs from the acid III remain in solution and are first precipitated
on the addition of a considerable quantity of salt. The dyes in question are
produced by the action of the diazo compound of the mixture of the Beta-
naphthylamine-mono-sulpho acid I upon the above named alpha-naphtol mono-
sulpho acids.
The best method of proceeding is as follows:-
The dye stuff liquor which is obtained by the action on the alpha-naphtol mono-
sulpho acid of Pirias naphtion acid,-of the diazo compound of the mixture of the
Beta-naphtylamine-mono-sulpho acids directly obtained according to Dr Elscesser's
method by acting on Beta-naphtylamine with sulphuric acid (or according to the

page_text: method given by the Badischen Anilin and Soda Fabrik) and which liquor contains
about 60 kilogrammes of dye stuff in 1000 Litres of water, is allowed to stand two
hours and then filtered.
The residue consists of the dye stuff of the Beta-naphtylamine-mono-sulpho
acid I.
Common Salt is gradually added to the filtrate until a test solution or filtrate
only gives a precipitate after standing some time; (about 100 to 120 kilogrammes
per 1000 litres of liquor are sufficient) whereby the dye stuff of the Beta
Naphtylamine-mono-sulpho acid III is obtained as a precipitate.
The dye stuffs are purified in the usual manner by redissolving.
In order to precipitate the dye stuff of the Beta-naphtylamine-mono-sulpho
acid I about 25 kilogrammes of salt are added to about 1000 litres of the liquor of
the dye stuffs of the alpha naphtol mono-sulpho acid from Laurents Sulpho-
naphtalidam acid; the dye stuffs of the acid III are then separated out from the
filtrate in the manner above described.
:
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.'
"
The method of producing or manufacturing red azo dye stuffs or coloring matters
substantially as herein set forth.