Improvements in the Production of Oxy-anthraquinone.
Year: 1893

page_text: Date of Application, 18th Sept., 1893
Complete Specification Left, 18th June, 1894-Accepted, 21st July, 1894
PROVISIONAL SPECIFICATION.
[Communicated from abroad by THE FARBWERKE vormals MEISTER LUCIUS
AND BRUNING, of Hoechst a/ Main, in the Empire of Germany, Chemical
Manufacturers.]
Improvements in the Production of Oxy-anthraquinone.
1, 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:-
My foreign correspondents have discovered that the mono-nitro-anthraquinone,
which is formed by nitrating anthraquinone in sulphuric solution, can be converted
in quite a simple way into oxy-anthra-quinone. Contrary to what has been
asserted in papers on this subject, the said body undergoes changes already by
continued boiling with aqueous alkalies. Amongst the products of the decom-
position can be traced amido-anthraquinone. On the other hand the reaction
proceeds under formation of oxy-anthraquinone when mono-nitro-anthraquinone is
submitted to a continued treatment with a large excess of caustic alkalies or
alkaline earths in acetonic or alcoholic solution.
The manner of carrying out the invention is explained more fully in the following
example:
-
Mono-nitro-anthraquinone is heated in a vessel, furnished with a return cooler.
to slight boiling for about 2 days together with about the equal quantity by
weight of caustic soda and from 10 to 20 times the quantity by weight of ethyl-
or methyl alcohol. Already after a short lapse of time the liquid assumes a
brown-red colour, and when the action is complete the sodium salt of the oxy-
anthraquinone separates in crystalline form ou cooling down. The mass is poured
into cold water, in which the sodiumn-salt is soluble with great difficulty, and it is
then filtered off from the diluted alcohol. The oxy-anthra-quinone is purified by
precipitation from its diluted alkaline solution.
A preparation recrystallised from alcohol has the qualities of the ortho-oxy-
anthraquinone and the analysis gives data in accordance with the formula of that
body.
Dated this 18th day of September 1893,
ABEL & IMRAY,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in the Production of Oxy-anthraquinone.
1, 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 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 discovered that the mono-nitro-anthraquinone,
which is formed by nitrating anthraquinone in sulphuric solution, can be converted
in quite a simple way into oxy-anthraquinone. Contrary to what has been
asserted in papers on this subject, the said body undergoes changes already by
continued boiling with aqueous alkalies.

page_text: Amongst the products of the decomposition can be traced amido-anthraquinone.
On the other hand the reaction proceeds under formation of oxy-anthraquinone
when mono-nitro-anthraquinone is submitted to a continued treatment with a large
excess of caustic alkalies or alkaline earths in acctonic or alcoholic solution.
The manner of carrying out the invention is explained more fully in the following
example :―
Mono-nitro-anthraquinone is heated in a vessel, furnished with a return cooler,
to slight boiling for about two days together with about the equal quantity by
weight of caustic soda and from 10 to 20 times the quantity by weight of ethyl
or methyl alcohol. Already, after a short lapse of time, the liquid assumes a
brown red colour, and when the action is complete the sodium salt of the oxy-
anthraquinone separates in crystalline form on cooling down. The mass is poured
into cold water, in which the sodium salt is soluble with great difficulty, and it is
then filtered off from the diluted alcohol. The oxy-anthra-quinone is purified by
precipitation from its diluted alkaline solution.
A preparation recrystallised from alcohol has the qualities of the ortho-oxy-
anthraquinone and the analysis gives data in accordance with the formulæ of that
body.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what
I claim is
The herein described process for production of oxy-anthraquinone by treating
nitroanthraquinone with caustic alkalies or alkaline earths in alcoholic or acetonic
solution.
Dated this 10th day 1007
ABEL & IMRAY,
Agents for the Applicant.