The Manufacture or Froduction of Anthraquinone Dyestuffs.
Year: 1899

page_text: Date of Application, 15th Aug., 1899
Complete Specification Left, 30th Apr., 1900-Accepted, 16th June, 1900
[Communicated from abroad by THE FARBENFABRIKEN vormals FRIEDRICH BAYFR
& Co., of Elberfeld, Germany.]
The Manufacture or Froduction of Anthraquinone Dyestuffs.
I, HENRY EDWARD NEWTON, of the Office for Patents, 6, Bream's Buildings,
Chancery Lane, in the County of London, l'atent Agent, do hereby declare the
nature of this invention to be as follows:-
It is known that, by treating dinitroanthraquinones with sulphur sesquioxide
(that is to say, with a mixture prepared from fuming sulphuric acid and sulphur),
on the one hand, the nitro groups are transformed into amido groups, whilst on
the other hand, hydroxy groups are introduced into the anthracene nucleus, di-
amido-dioxyanthraquinones being thus obtained.
My foreign correspondents have now found that the reaction proceeds in a
different manner, if certain dinitro-dioxyanthraquinone sulphonic acids, viz.,
the dinitro-anthrarufine disulphonic acid and the dinitrochrysazine-disulphonic
acid (which acids have been described by my foreign correspondents in the
Specification to Letters Patent No. 12011), are subjected to the action of sul-
phur sesquioxide. In this case only the reduction of the nitro groups takes place,
diamido-anthrarufine disulphonic acid & diamidochrysazine-disulphonic acid
being produced, which acids have likewise been described in the above men-
tioned Letters Patent.
In order to illustrate the new process, the following example is given, the parts
being by weight.
EXAMPLE.
A mixture prepared from 10 parts of dinitro-anthrarufine-disulphonic acid,
200 parts of a fuming sulphuric acid containing 20 per cent. of SO, and 5 parts
of flowers of sulphur, is heated, with continuous stirring, at from 50 to 80 degrees
Centigrade, until, on testing, unchanged dinitro anthrarufine disulphonic acid is
no longer found to be contained therein. Subsequently, the mixture is poured
iuto ice-water. From the resulting solution, after previous filtering, the diamido
dye-stuff is separated by the addition of common salt.
The process proceeds in an analogous manner if, instead of the dinitro-anthra-
rufine-disulphonic acid, dinitro-chrysazine disulphonic acid is employed.
My foreign correspondents do not wish to confine themselves to the particulars
given in the above example, which is merely typical.
Dated this 13th day of August 1899.
NEWTON & SON,
Agents for the Applicant.

page_text: The Manufacture or Production of Anthraquinone Dyestuffs.
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:-
It is known that, by treating dinitroanthraquinones with sulphur sesquioxide
(that is to say, with a mixture prepared from fuming sulphuric acid and sulphur),
on the one hand, the nitro groups are transformed into amido groups, whilst, on
the other hand, hydroxy groups are introduced into the anthracene nucleus, di-
amido-dioxyanthraquinones being thus obtained.
My foreign correspondents have now found that the reaction proceeds in a
different manner, if certain dinitro-dioxyanthraquinone sulphonic acids, viz.,
the dinitro-anthrarufiue disulphonic acid and the dinitrochrysazine disulphonic
acid (which acids have been described by my foreign correspondents in the
Specification to Letters Patent No. 12011), are subjected to the action of sul-
phursesquioxide, and the mixtures thus obtained are poured into water. In this
ease, the reduction of the nitro groups takes place, diamido anthrarufine disul-
phonic acid and diamido-chrysazine disulphonic acid being produced, which acids
have likewise been described in the above mentioned Letters Patent.
In order to illustrate the new process, the following example is given, the parts
being by weight.
EXAMPLE.
A mixture prepared from 10 parts of dinitro-anthrarufine disulphonic acid,
200 parts of a fuming sulphuric acid containing 20 per cent. of SO, and 5 parts
of flowers of sulphur, is heated, with continuous stirring, at from 50 to 80 degrees
Centigrade, until, on testing, unchanged dinitro anthrarufine disulphonic acid is
no longer found to be contained therein. Subsequently, the mixture is poured
into ice-water. From the resulting solution, after previous filtering, the diamido
dye-stuff is separated by the addition of common salt.
The process proceeds in an analogous manner if, instead of the dinitro-anthra-
rufine disulphonic acid, dinitro chrysazine disulphonic acid is employed.
My foreign correspondents do not wish to confine themselves to the particulars
given in the above example, which is merely typical, and can be varied within
wide limits, without altering thereby the nature of the present invention.
Having now particularly described and ascertained the nature of the said
invention, and in what manner the same is to be performed, as communicated to
me from abroad, I declare that what I claim is:
The process for the production of diamido anthrarufine-disulphonic acid and
diamido-chrysazine-disulphonic acid, which process consists in treating dinitro-
anthrarufine disulphonic acid and dinitrochrysazine disulphonic acid, with sul-
phur-sesquioxide, and pouring the resulting mixture into water, substantially as
herembefore described.
DYDAL 1
1 1000
NEWTON & SON,
Agents for the Applicant.