The Manufacture or Production of Coloring Matters derived from Anthraquinone.
Year: 1897

page_text: Date of Application. 8th Sept., 1897
Complete Specification Left. 31st May, 1898-Accepted, 30th July, 1898
[Communicated from abroad by THE FARBENFABRIKEN VORMALS FRIEDRICH BAYER &
Co., of Elberfeld, Germany.]
The Manufacture or Production of Coloring Matters derived from
Anthraquinone.
I, HENRY EDWARD NEWTON, of the Office for Patents, 6, Bream's Buildings,
Chancery Lane, in the County of London, Patent Agent, do hereby declare the nature
of this invention to be as follows:-
My foreign correspondents discovered some time since that valuable anthraquinone
5 dye-stuffs could be produced by the reduction of dinitro-anthrarufine and dinitro-
chrysazine disulphonic acid, diamido anthrarufine and diamido chrysazine disulphonic
acid being thus obtained, which dye unmordanted wool, in acid baths, blue shades.
My foreign correspondents have now found that the said reluction takes place in
two stages, and that the intermediate products formed in the first stage can be
isolated, if, in effecting the reduction, only that quantity of the reducing agent
which corresponds with 8 atoms of hydrogen is used.
The intermediate products thus isolated are hydroxylamine compounds, which most
probably have the following general formula:-
HO.HN
CO
NH.OH
HO- CH
CH
OH
HOS
CO
SO₂H
5
They represent colouring matters which dye unmordanted wool, in acid baths, blue
shades, and yield greenish-blue shades on chromium mordants.
The new products, which can easily be obtained in a crystalline state, are
characterized as hydroxylamine compounds by the facts that, on the one hand, they
can be transformed by reducing agents into the diamido compounds above referred
0 to, and that, on the other hand, they are easily changed by oxidizing into the same
dinitro compounds as the original ingredients used in the new process herein before
defined

page_text: chloride is added. On cooling, the ammonium salt of paradihydroxylamine.
anthrarufine disulphonic acid separates in the shape of small needles.
In an analogous manner, the paradihydroxylaminechrysazine disulphonic acid is
obtained from paradinitro chrysazine disulphonic acid. It exhibits properties similar
to those of the above described new compound derived from anthrarufine.
My foreign correspondents do not intend to confine themselves to the particulars
given in the above example, which are merely typical, and can be varied within wide
limits, without altering thereby the nature of the present invention, which, in general
terms, relates to the production of the herein before defined hydroxylamine compounds
by a partial reduction of the corresponding dinitro compounds, and to the
transformation of the new compounds into the corresponding diamido bodies.
Dated this 8th day of September 1897.
NEWTON & SON,
Agents for the Applicant.
DIEUIT ICATION.
The Manufacture or Production of Coloring Matters derived from
Anthraquinone.
I, HENRY EDWARD NEWTON, of the Office for Patents, 6, Bream's Buildings,
Chancery Lane, in the County of London, 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 :-
My foreign correspondents discovered some time since that valuable anthraquinone
dyestuffs could be produced by the reduction of dinitro-anthrarufine and dinitro-
chrysazine disulphonic acid, diamido anthrarufine, and diamido chrysazine disulphonic
acid being thus obtained, which dye unmordanted wool, in acid baths, blue shades.
My foreign correspondents have now found that the said reduction takes place in
two stages, and that the intermediate products formed in the first stage can be
isolated, if, in effecting the reduction, only that quantity of the reducing agent which
corresponds with 8 atoms of hydrogen, is used.
The intermediate products thus isolated are hydroxylamine compounds, which
most probably have the following general formula:-
HOHN
HO-
HOS
>NH.OH
CH
-OH
CO
S'O,H
and are valuable coloring matters.
The new products, which can easily be obtained in a crystalline state, are
characterized as hydroxylamine compounds from the fact that (on the one hand) they g
can be transformed by reducing agents into the diamido compounds above referred
to, and that (on the other hand) they are easily changed by oxidizing into the same
dinitro compounds as the original ingredients used in the new process hereinbefore
defined.
In order to illustrate this new process, the following example is given, the parts 4
being by weight :-