Manufacture of Yellow to Red-brown Coloring Matters suitable for Dyeing Wool.
Year: 1893

page_text: Date of Application, 4th Jan., 1893
Complete Specification Left, 4th Oct., 1893-Accepted 4th Nov., 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 Yellow to Red-brown Coloring Matters suitable for
Dyeing Wool.
I, OLIVER IMRAY of No. 28 Southampton Buildings, in the County of London,
Chartered Patent Agent do hereby declare the nature of this invention to be as
follows:-
Anthrachrysone, which by itself is of no value as coloring matter, furnishes on
being treated with fuming. sulphuric acid valuable yellow to red-brown coloring
matters.
Experiments have shown that two sulphonic acid groups can be introduced into
anthrachrysone, and that the resulting disulphonic acid is a coloring matter, dyeing
non-mordanted as well as mordanted wool, shades fast against soap.
The invention is carried out as in the following example.
Purified anthrachrysone is mixed with about 3 to 4 times its weight of fuming
sulphuric acid of from 10 to 20 per cent. SO, and the mixture is heated at 100° C.
until a sample gives with water a perfectly clear solution.
The mass resulting from the reaction is poured into a large quantity of water,
the whole is boiled, and, in case a small quantity of anthrachrysone has remained
unchanged, this is removed by filtering.
The sulphonic acid can be separated by precipitating it from the solution by
means of common salt, or, preferably, it is separated in the form of its sodium salt
by supersaturating the solution with carbonate of soda. The sodium salt is
obtained from the hot solution in the form of an indistinctly crystalline rust-colored
precipitate which cannot be dissolved without very 'great difficulty in cold water.
By recrystallisation from very dilute acetic acid, the acid sodium salt is obtained
in beautiful golden leaflets with a green lustre ; its composition in sulphur and
sodium is in conformity with the formula of the sodium salt of anthrachrysone-
disulphonic acid C₁HO (SO,Na)2.
6
The anthrachrysone-disulphonic acid dyes non-mordanted wool yellow tints,
chromed wool red-brown tints, and alumined wool orange tints.
All these tints excel by the extraordinary vividness and purity of their
appearance; also they are fast against soap, and have remarkable capability of
producing uniform tints.
Dated this 4th day of January 1893.
ABEL & IMKAY,
Agents for the Applicant.
COMPLETE SPECIFICATION.
5 Manufacture of Yellow to Red-brown Coloring Matters suitable for
Dyeing Wool.
I, OLIVER IMRAY, of No. 28 Southampton Buildings, 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
O and by the following statement :—
Anthrachrysone, which by itself is of no value as coloring matter, furnishes, on

page_text: being treated with fuming sulphuric acid, valuable yellow to red-brown coloring
matters.
Experiments have shewn that two sulphonic acid groups can be introduced into
anthrachrysone, and that the resulting disulphonic acid is a coloring matter, dyeing
non mordanted as well as mordanted wool shades fast against soap. The invention
is carried out as in the following example.
Purified anthrachrysone is mixed with about 3 to 4 times its weight of fuming
sulphuric acid of from 10 to 20 per cent. SO, and the mixture is heated at 100° C.
until a sample gives with water a perfectly clear solution.
The mass resulting from the reaction is poured into a large quantity of water,
the whole is boiled, and, in case a small quantity of anthrachrysone has remained
unchanged, this is removed by filtering.
The sulphonic acid can be separated by precipitating it from the solution by
means of common salt, or, preferably, it is separated in the form of its sodium salt
by supersaturating the solution with carbonate of soda. The sodium salt is obtained
from the hot solution in the form of an indistinctly crystalline rust coloured pre-
cipitate, which cannot be dissolved without very great difficulty in cold water.
By recrystallisation from very dilute acetic acid, the acid sodium salt is obtained
in beautiful golden leaflets with a green lustre; its composition in sulphur and
sodium is in conformity with the formula of the sodium salt of anthrachrysone
disulphonic acid CHO. (SO,Na)2.
The anthrachrysone-disulphonic acid dyes non mordanted wool yellow tints,
chromed wool red brown tints, and alumined wool orange tints.
All these tints excel by the extraordinary vividness and purity of their
appearance; also they are fast against soap and have remarkable capability of
producing uniform tints..
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 :-
1. The manufacture of yellow to red brown colouring matters by converting
anthrachrysone by means of fuming sulphuric acid into anthrachrysone disulphonic
acid.
2. The colouring matters produced in the manner above referred to.
ABEL & IMRAY,
Agents for the Applicant.