Manufacture of Blue Coloring Matters from Ortho-dinitro- 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.]
-
Manufacture of Blue Coloring Matters from Ortho-dinitro-
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:-
In the Specifications to German Letters Patent No. 6525 and English Letters
Patent No. 2177 of 1878 it is stated in the description of the process that blue
coloring matters are obtained by heating dinitro-anthraquinone with fuming
sulphuric acid of 40 per cent.
My foreign correspondents have discovered that this formation of coloring
matters takes place already at ordinary temperature when fuming sulphuric acid
of 70 per cent. is employed.
In this latter case the reaction proceeds more smoothly and the yield of coloring
matter is a greater one.
EXAMPLE.
10 parts of ortho-dinitro-anthraquinone are dissolved in 100 parts of fuming
sulphuric acid of 70 per cent. anhydride, and the mixture is allowed to rest at
ordinary temperature for several days or until a sample shows that a sufficient
quantity of coloring matter has been formed.
The mass is now poured into ice-water, boiled, filtered and washed neutral with
hot water.
The coloring matters dye chromed stuffs blue shades and excel by great
fastness to fulling and light.
Dated this 21st day of November 1892.
ABEL & IMRAY,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Manufacture of Blue Coloring Matters from Ortho-dinitro-
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 :-
In the Specifications to German Letters Patent No. 6525 and English Letters
Patent No. 2177 of 1878 it is stated in the description of the process that blue
coloring matters are obtained by heating dinitro-anthraquinone with fuming
sulphuric acid of 40 per cent.
My foreign correspondents have discovered that this formation of coloring
matters takes place already at ordinary temperature when fuming sulphuric acid
of 70 per cent. is employed.
In this latter case the reaction proceeds more smoothly and the yield of coloring
matter is a greater one.

page_text: EXAMPLE.
10 parts of ortho-dinitro-anthraquinone are dissolved in 100 parts of fuming
sulphuric acid of 70 per cent. anhydride, and the mixture is allowed to rest at
ordinary temperature for several days or until a sample shows that a sufficient
quantity of coloring matter has been formed.
The mass is now poured into, ice-water, boiled filtered and washed neutral with
hot water.
The coloring matters dye chromed stuffs blue shades and excel by great fastness
to fulling and light.
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 manufacture of blue coloring matters by treating ortho-dinitro-anthra-
quinone at ordinary temperature with fuming sulphuric acid.
2. The coloring matters manufactured as above set forth.
Dated this 21st day of August 1893.
ABEL & IMRAY,
Agents for the Applicant.