Improvements relating to the Preparation of Diazo Salts, and to the Use of the same for Dyeing and Printing.
Year: 1894

page_text: Date of Application, 28th Sept., 1894
. Complete Specification Left, 26th June, 1895-Accepted, 27th July, 1895
PROVISIONAL SPECIFICATION.
Improvements relating to the Preparation of Diazo Salts, and to the
Use of the same for Dyeing and Printing.
Ì, Dr. ADOLF FEER, of Mülhauson, Alsace, in the Empire of Germany, do
hereby declare the nature of this invention to be as follows:-
I have discovered a general method for the isolation of aromatic diazo-
compounds in a form sufficiently stable to admit of the introduction of the same
into commerce.
For this purpose I prepare the diazo-salts of the following acids; viz.:
Carboxylic, sulphonic and di-sulphonic acids of the aromatic hydrocarbons, and
the derivatives of these acids; ethylsulphuric acid, phenolsulphonic acids, phenyl-
carboxylic acids and the homologues of these acids.
As an example I give here a description of the preparation of a new derivative
of parabitranilin :
26.6 kilogramms of paranitranilin are diazotized by 60 kgrs. of hydrochloric
acid (19 Bé.) and 14 kgrs. of nitrite of soda. The solution thus obtained is poured
into a concentrated solution of 72-4 kgrs. of a naphthalene sulphonate of sodium.
The voluminous precipitate is filtered off, pressed and dried at about 30° C.
As a second example I mention the preparation of the dianisidine derivative
34.2 kgrs. of sulphate of diauisidine are diazotized by means of '36 kgrs. of
hydrochloric acid and 14 kgrs. of nitrite of sodium.
The solution thus obtained is poured into a solution of 74-8 kgrs. of paranitro-
toluol-sulphonate of sodium, and the precipitation completed by addition of common
salt. The precipitate is filtered off and dried as above described.
The salts thus obtained are soluble in the quantities of water generally used for
dyeing.
The dye-bath is a simple solution of my products, whilst the printing colour is a
simple mixture of my salts with the thickening.
Dated this 28th day of September 1894.
D
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicant.
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements relating to the Preparation of Diazo Salts, and to the
Use of the same for Dyeing and Printing.
I, Dr. ADOLF FEER, of Mülhausen, Alsace, in the Empire of Germany, 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:—
I have discovered a general method for the isolation of aromatic diazo
compounds in a form sufficiently stable to admit of the introduction of the same
into sommares

page_text: For this purpose, I prepare the diazo salts of the following acids, viz. :
Carboxylic, sulphonic and disulphonic acids of the aromatic hydrocarbons and
the derivations of these acids; methyl-sulphuric acid, phenylsulphuric acids and
the homologues of these acids.
As an example I give here a description of the preparation of a new derivative
of paranitraniline :
27.6 kilogrammes of paranitraniline are diazotised by 28 kgrs, of sulphuric acid
and 14 kgrs. of nitrite of sodium. The solution thus obtained is poured into a
concentrated solution of 72.4 kgrs. of alphanaphthalinesulphonate of sodium. The
voluminous precipitate is filtered off, pressed' and dried at about 30° C.
As a second example, I mention the preparation of the dianisidine derivative :
34.2 kgrs. of sulphate of dianisidine are diazotised by means of 36 kgrs. of
hydrochloric acid and 14 kgrs. of nitrite of sodium. The solution thus obtained
is poured into a solution of 74:8 kgrs..of paranitrotoluosulphonate of sodium and
the precipitation made complete by adding common salt. The precipitate is
filtered off and dried as described above.
The salts thus obtained are soluble in the amount of water generally used for
dyeing. The dye-bath is a simple solution of my products, to which is added some
acotate of sodium, the printing colour is a simple mixture of my salts with the
thickening.
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 :
1. The preparation of the salts, formed by the diazo-bases with the carboxylic,
sulphonic and polysulphonic acids of benzol,, naphthaline, anthracene and their
derivatives, the methylsulphuric and phenylsulphuric acids and their homologues.
2. The application of the diazo salts prepared as described in the above claim,
for dyeing and printing.
DL: 00 11005
1005
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicant.
HASELTINE, LAKE & Co.;
45 Southampton Buildings, London, W.C., Agents for the Applicant.