Improvements in the Manufacture or Production of Anthraquinone Dye-stuffs.
Year: 1899

page_text: [Communicated from abroad by THE FARBENFABRIKEN vormals FRIEDRICH BAYER
& Co., of Elberfeld, Germany].
Improvements in the Manufacture or Production of Anthraquinone
Dye-stuffs.
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 corespondents have found that by treating monobiomedinitro-
anthrarufinemono-sulphonic acid and monobromedinitrochrysazinemonosulphonic
acid with reducing agents, monobromediamidoanthrarufinemono-sulphonic acid,
and monobromediamidochrysazinemonosulphonic acid are obtained, which acids
represent valuable dye-stuffs.
According to the researches of my foreign correspondents, the above mentioned
dinitro acids (hitherto unknown) can be obtained, for instance, from monobrome-
anthrarufine, or monobromechrysazine, by first sulphonating, and then nitrating,
in a suitable manner.
The monobromedinitroanthrarufinemonosulphonic acid thus obtained is an
orange crystalline powder which dissolves in water and in concentrated sulphuric
acid, with a yellow color... If boric acid is added to the sulphuric acid solution,
the color changes into red. On heating this solution, the color is transformed
into reddish-violet..
3
In order to produce the monobromediamidoanthrarufinemono-sulphonic acid,
my foreign correspondents may proceed as follows, the parts being by weight:
To a solution of 26 parts of monobromedinitroanthrarufinemonosulphonic acid,
in 2000 parts of water, a solution prepared from 48 parts of stannous chloride,
130 parts of concentrated hydrochloric acid, and 130 parts of water, is added at
about from 50 to 60 degrees Centigrade. After a short time. the color of the
mixture will change into blue, the greater part of the new diamido acid being
separated during the reaction. When the reduction is finished, a hundred parts
of hydrochloric acid are added. Subsequently the new dye-stuff is isolated by
filtration. It is-soluble in alkalies with a blue color. By concentrated sulphuric
acid, it is dissolved with a yellow color, which, on the addition of boric acid,
changes at first into red and then into blue. This blue solution exhibits a spec-
trum which is characterized by two lines in its red and in its vellow part. The
new coloring dyes unmordanted wool bright blue shades, whilst it yields on
chrome mordanted wool, bright and fast greenish-blue shades.
If, instead of the bromedinitroanthrarufinesulphonic acid, the above mentioned
bromedinitrochrysazinesulphonic acid is employed, monobromediamidochrysazine
monosulphonic acid is obtained, which exhibits properties analogous to those of
the corresponding anthrarufine derivative hereinbefore described.
It may be pointed out that my foreign correspondents do not intend to confine

page_text: themselves to the particulars given in the foregoing specification, as these can
be varied within wide limits. Thus, for instance, the reduction of the nitro acids
can be performed also with the aid of other acid, neutral, or alkaline reducing
agents. The reducing action of the electric current may likewise be employed.
Such or the like variations do not alter the nature of the present invention.
1
11.1 J 1900
NEWTON & SON,
Agents for the Applicant.
CUMPLEIE DI MULTICATION.
Improvements in the Manufacture or Production of Anthraquinone
Dye-stuffs.
T, 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 have found that, by treating monobromedinitro-
anthrarufinemono-sulphonic acid and monobromedinitrochrysazinemonosulphonic
acid, with reducing agents, monobromediamidoanthrarufine monosulphonic acid
and monobromediamidochrysazine monosulphonic acid are obtained, which acids
represent valuable dyestuffs.
According to the researches of my foreign correspondents the above mentioned
dinitro acids (hitherto unknown) can be obtained, for instance, by the action of
one molecule of bromine on dinitroanthrarufinedisulphonic acid and on dinitro-
chrysazinedisulphonic acid.
The monobromedinitroanthrarufine-monosulphonic acid thus obtained is an
orange crystalline powder, which dissolves in water, and in concentrated sulphuric
acid, with a yellow color. If boric acid is added to the sulphuric acid solution,
the color changes into red. On heating this solution, the color is transformed into
reddish-violet.
In order to produce the monobromediamidoanthrarufine monosulphonic acid,
my foreign correspondents may proceed, as follows, the parts being by weight:-
To a solution of 20 parts of monobromedinitroanthrarufine monosulphonic acid
in 2000 parts of water, a solution prepared from 48 parts of stannous chloride,
130 parts of concentrated hydrochloric acid and 130 parts of water, is added, at
about from 50 to 60 degrees Centigrade. After a short time, the color of the
mixture will change into blue, the greater part of the new diamido acid being
separated during the reaction. When the reduction is finished, a hundred parts
of hydrochloric acid are added. Subsequently, the new dye-stuff is isolated by
filtration. It is soluble in alkalies, with a blue color. By concentrated sulphuric
acid, it is dissolved with a yellow color, which, on the addition of boric acid,
changes at first into red, and then into blue. This blue solution exhibits a
spectrum which is characterized by two lines in its red and in its yellow part.
The new colouring matter dyes unmordanted wool bright blue shades, whilst it
yields on chrome mordanted wool, bright and fast greenish-blue shades.
If, instead of the bromedinitroanthrarufine sulphonic acid, the above mentioned
bromedinitrochrysazine sulphonic acid is employed, monobromediamidochrysazine
mono-sulphonic acid is obtained, which exhibits properties analogous to those of
the corresponding anthrarufine derivative hereinbefore described.
It may be pointed out that my foreign correspondents do not intend to confine
themselves to the particulars given in the foregoing specification, as these can be

page_text: varied within wide limits. Thus, for instance, the reduction of the nitro acids
can be performed also, with the aid of other acid, neutral, or alkaline reducing
agents. The reducing action of the electric current may likewise be employed.
Such or the like variations do not alter the nature of the present invention.
Having now particularly described and ascertained the nature of the said in-
vention and in what manner the same is to be performed, as communicated to
me from abroad, I declare that what I claim is:-
1. The process for the production of monobromediamidoanthrarufine mono-
sulphonic acid and monobromediamidochrysazine monosulphonic acid, by treating
monobromedinitroanthrarufine monosulphonic acid and monobrome-dinitrochry-
sazine monosulphonic acid with suitable reducing agents, substantially as here-
inbefore described.
2. As new articles of manufacture, the new dye-stuffs obtainable by the process
herein before described and claimed.
Dated this 0th dove of Fahmi 1000
NEWTON & SON,
Agents for the Applicant.