Manufacture of Brown Colouring Matters directly Dyeing Cotton.
Year: 1899

page_text: Date of Application, 5th June, 1899
PROVISIONAL SPECIFICATION.
Manufacture of Brown Colouring Matters directly Dyeing Cotton.
I, CHARLES DENTON ABEL, of Birkbeck Bank Chambers, Southampton Buildings,
in the County of London, Consulting Engineer and Chartered Patent Agent,
do hereby declare the nature of this invention (as communicated to me from
abroad by The Actien Gesellschaft für Anilin Fabrikation, of Berlin, in the
Empire of Germany, Chemical Manufacturers) to be as follows:-
This invention relates to the production of brown colouring matters, directly
dyeing cotton, by treating with sulphur and sulphides of alkalies the con-
densation products obtained by allowing para- or ortho-nitrochlorobenzene mono-
sulphonic acid to act upon meta-toluylenediamine.
The condensation products referred to are obtained by heating together in a
vessel connected with a reflux condenser, 26 kilos. of the sodium salt of para-
or ortho-nitrochlorobenzenemonosulphonic acid, 122 kilos. of meta-toluylenedia-
mine, about 6 kilos. of calcium carbonate and 300 litres of water, until no
more carbonic acid is given off.
The reaction product is filtered and the nitrosulphonic acid formed is separated
by addition of a mineral acid to the filtrate. It is thus obtained in the form
of a yellow precipitate, which is little soluble in cold water more easily soluble
in hot water and dissolves in alkali lyes with brown-yellow or orange coloration.
The invention is illustrated by the following example:
20 kilos. of the condensation product from para- or ortho-nitrochlorobenzene-
monosulphonic acid and meta-toluylenediamine, 6 kilos. of sodium sulphide and
20 kilos. of sulphur are gradually heated to 180° C., until the mass is reduced
to complete dryness. The product thus obtained is pulverised and can then be
directly employed for dyeing. It dissolves in water with brown colour, which
on addition of sodium sulphide is turned a little more red. Mineral acids produce
in the aqueous solution of the dyestuff a brown precipitate. The dyestuff dissolves
in concentrated sulphuric acid with violet-brown colour.
It dyes unmordanted cotton dark brown shades, which by subsequent treat-
ment with a mixture of copper sulphate and potassium chromate are turned
bronze.
Dated this 5th day of June 1800

page_text: do hereby declare the nature of this invention (as communicated to me from
abroad by The Actien Gesellschaft für Anilin Fabrikation, of Berlin, in the
Empire of Germany, Chemical Manufacturers) and in what manner the same
is to be performed, to be particularly described and ascertained in and by the
following statement: —
This invention relates to the production of brown colouring matters, directly
dyeing cotton, by treating with sulphur and sulphides of alkalies the con-
densation products obtained by-allowing para- or ortho-nitrochlorobenzenemono-
sulphonic acid to act upon meta-toluylenediamine.
The condensation products referred to are obtained by heating together in a
vessel connected with a reflux condenser, 26 kilos. of the sodium salt of para-
or ortho-nitrochlorobenzenemonosulphonic acid, 122 kilos. of meta-toluylenedia-
mine, about 6 kilos. of calcium carbonate and 300 litres of water, until no
more carbonic acid is given off.
The reaction product is filtered and the nitrosulphonic acid formed is separated
by addition of a mineral, acid to the filtrate. It is thus obtained in the form
of a yellow precipitate, which is little soluble in cold water more easily soluble
in hot water and dissolves in alkali lyes with brown-yellow or orange coloration.
The invention is illustrated by the following example;
20 kilos. of the condensation product from para- or ortho-nitrochlorobenzene-
monosulphonic acid and meta-toluylenediamine, 60 kilos. of sodium sulphide and
20 kilos. of sulphur are gradually heated to 180° C. until the mass
is dry. The product thus obtained is pulverised and can then be
directly employed for dyeing. It dissolves in water with brown colour, which
on addition of sodium sulphide is turned a little more red. Mineral acids produce
in the aqueous solution of the dyestuff a brown precipitate. The dyestuff dissolves
in concentrated sulphuric acid with violet-brown colour.
It dyes unmordanted cotton dark brown shades, which by subsequent treat-
ment with a mixture of copper sulphate and potassium chromate are turned
bronze.
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 herein described manufacture of brown colouring matters directly
dyeing cotton by heating with sulphur and sulphides of alkali-metals the con-
densation products obtained by allowing either para- or ortho-nitrochlorobenzene-
monosulphonic acid to act upon meta-toluylenediamine.
2. The colouring matters manufactured as above set forth.
Dated this 14th day of February 1900.
ABEL & IMRAY,
Agents for the Applicant.
ABEL & IMRAY,
Agents for the Applicant.