Improvements in the Production of Blue Coloring Matters from Amido-nitro-anthraquinone.
Year: 1892

page_text: Date of Application, 21st Nov., 1892
Complete Specification Left, 21st Aug., 1893-Accepted, 30th Sept., 1893
PROVISIONAL SPECIFICATION.
[Communicated from abroad by THE FARBWERKE vormals MEISTER LUCIUS
AND BRUNING, of Hoechst a/ Main, in the German Empire, Chemical.
Manufacturers.]
Improvements in the Production of Blue Coloring Matters from
Amido-nitro-anthraquinone.
I, OLIVER IMRAY, of No. 28 Southampton Buildings, Chancery Lane, in the
County of London, Chartered Patent Agent, do hereby declare the nature of this
invention to be as follows:-
The English Patent Specification No. 2177 of 1878, and the German Patent
No. 6526 have made it known, that by treating mono-nitro- or mono-amido-
anthraquinone, or dinitro or diamido-anthraquinone with fuming sulphuric acid
there are obtained colouring matters ranging in shade from red to blue.
At the date of these Patents the amido-bodies were produced by submitting
nitro-anthraquinone to the action of ammonia under pressure.
My foreign correspondents have discovered that the intermediate product
between ortho-dinitro and diamido-anthraquinone, the amido-nitro-anthraquinone,
on being subjected to the same treatment, furnishes a yield of similar colouring
matters, larger and also of more beautiful tint, than the bodies mentioned in the
Specifications above referred to.
This amido-nitro-anthraquinone, which has not hitherto been described, is
obtained by treating dinitro-anthraquinone with alcoholic or aqueous ammonia
under pressure.
In fuming sulphuric acid of 70 per cent. it dissolves with red-violet
colour, whereas the diamido anthraquinone in this solvent dissolves with pure blue
colour. In sulphuric acid of 66 per cent. both bodies dissolve with yellow colour,
but the amido-nitro-anthraquinone is of difficult solubility, whereas the diamido-
anthraquinone is of easy solubility in this solvent.
The amido-nitro-anthraquinone crystallises in the form of small reddish brown
PAAMPLES:
1) 10 parts by weight of amido-nitro anthraquinone are slowly dissolved in
100 parts by weight of fuming sulphuric acid of 70 per cent., and at ordinary
temperature and left to repose until a sample shews that a sufficient quantity of
colouring matter has been formed.
When the temperature is moderately raised, say to 30° or 35° C. the operation is
completed in less time.
2) 10 parts by weight of amido-nitro anthraquinone are dissolved in 200 parts by
weight of fuming sulphuric acid of 40 per cent. and heated for about 8 hours at
about 130° to 160° C. Also, in this case, the operation can be considered complete
as soon as a sample shews sufficient formation of colouring matter.
3) 10 parts by weight of amido-nitro-anthraquinone are dissolved in 100 parts by
weight of fuming sulphuric acid of 40 per cent., heated for 3 to 4 hours at 130° to
140° C., 100 parts by weight of sulphuric acid of 66 per cent. are added, and the
whole is then kept for several hours at the above temperature.
The colouring matter is recovered in a well known manner, by pouring the mass
into water, boiling, filtering the precipitate and neutral washing.
DO37

page_text: The colouring matters thus obtained dye chromed materials blue shades and
excel by great fastness in fulling.
Dated this 21st day of November 1892
ABEL & IMRAY,
Agents for the Applicant.

page_text: 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 production of blue coloring matters which are fast in fulling, by treating
with fuming sulphuric acid amido-nitro-anthraquinone obtained from ortho-dinitro-
anthraquinone.
2. The coloring matters produced in the manner above referred to.
ABEL & IMRAY,
Agents for the Applicant.