IMPROVE- MENTS IN THE MANUFACTURE OF SOLID CUMIDINE AND THE PRODUCTION THEREFROM OF DIAZO CUMOLE AND THE SULFO ACIDS OF DIAZO CUMOLE FOR USE IN THE PREPARATION OF AZO COLORS
Year: 1882

page_text: LETTERS PATENT to Charles Denton Abel of N° 28 Southampton Buildings
Chancery Lane in the County of Middlesex for an Invention of "IMPROVE-
MENTS IN THE MANUFACTURE OF SOLID CUMIDINE AND THE PRODUCTION
THEREFROM OF DIAZO CUMOLE AND THE SULFO ACIDS OF DIAZO CUMOLE FOR
USE IN THE PREPARATION OF AZO COLORS " Communicated to him from
abroad by the Actien Gesellschaft für Anilin Fabrikation, an incorporated
company of Berlin in the German Empire
PROVISIONAL SPECIFICATION left by the said Charles Denton Abel at the
Office of the Commissioners of Patents on the 21st August 1882.
CHARLES DENTON ABEL of No 28. Southampton Buildings Chancery Lane in the
County of Middlesex "IMPROVEMENTS IN THE MANUFACTURE OF SOLID CUMIDINE
AND THE PRODUCTION THEREFROM OF DIAZOCUMOLE AND THE SULFO ACIDS OF
DIAZOCUMOLE FOR USE IN THE PREPARATION OF AZO COLORS
"3
[Communicated
to him from abroad by the Actien Gesellschaft für Anilin Fabrikation, an
incorporated company of Berlin in the German Empire]
The crude hydrochlorate of cumidine, obtained by heating hydrochlorate of
Xylidine with Methylic Alcohol in a closed digestor at 280° C. is converted into
the Nitrate.
The Nitrate, which dissolves with difficulty, is separated from the mother liquors
by a centrifugal apparatus and is washed with water.
A fine crystalline powder of Nitrates of the various modifications of the Cumidine
is obtained. If this Nitrate is converted by the usual process into the base and
then subjected to a fractional distillation, the parts boiling between 225 to 245° C
crystallize on cooling.

page_text: The crystals are separated from the non crystallizable mother liquors by means
of a centrifugal apparatus or by presses.
This crystallized Cumidine has a constant boiling point of from 235° to 236° C,
melts at 62° C and is advantageously used in the manufacture of Azo colors.
It is especially valuable, as its Diazocompounds give with the Disulfo acids of
Beta Naphthole colors, which are considerably superior in redness to similar
products at present on the market.
This
Another or angered colour is obtained by the combination of the Diazo compound
of the crystallized Cumidine with the Monosulfoacids of Beta Naphthole.
Cumidine is easily converted into a sulfoaid by means of sulphuric acid according
to the process well known in manufacturing Sulfanilic acid. The Diazo compound
of the Sulfo acid of the Cumidine likewise produces colors with Naphthole.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Charles Denton Abel in the Great Seal Patent Office on the
20th February 1883.
CHARLES DENTON ABEL of No: 28 Southampton Buildings, Chancery Lane, in the
county of Middlesex IMPROVEMENTS IN THE MANUFACTURE OF SOLID CUMIDINE
AND THE PRODUCTION THEREFROM OF DIAZOCUMOLE AND THE SULFO-ACIDS OF
DIAZOCUMOLE FOR USE IN THE PREPARATION OF Azo-COLORS" A communication
to me from abroad by the Actien Gesellschaft für Anilin Fabrikation, an
incorporated company of Berlin in the German Empire.
The crude bydrochlorate of cumidino, obtained by heating hydrochlorate of
Xylidine with Methylic Alcohol in a closed digestor at 280°. C is converted into
the Nitrate.
The Nitrate, which dissolves with difficulty, is separated from the mother liquors
by a centrifugal apparatus and is washed with water.
A fine crystalline powder of Nitrates of the various modifications of the
Cumidine is obtained. If this Nitrate is converted by the usual process into the
base, and then subjected to a fractional distillation, the parts boiling between 225°
to 245° C crystallize on cooling. The crystals are separated from the non-
crystallizable mother liquors by means of a centrifugal apparatus or by presses.
This crystallized Cumidine has a constant boiling point of from 235°. to 236° C,
melts at 62°. C and is advantageously used in the manufacture of Azo-colors.
It is especially valuable, as its diazo-compound gives, with the disulpho-acids of.
Beta Naphthole, colors which are considerably superior in redness to similar
products at present on the market.
Another orange red color is obtained by the combination of the diazo-compound
of the crystallized Cumidine with the Monosulpo-acids of Beta Naphthole. This
cumidine is easily converted into a sulfo-acids by means of sulphuric acid
according to the process well known in manufacturing sulfanilic acid. The diazo
compound of the sulfo-acid of the cumidine likewise produces colors with
naphthole.
Having thus described the nature of the said invention and in what manner
the same is to be performed, as communicated to me by any foreign correspondents,
I claim,
First: The hercin described manufacture of solid or crystallised cumidine.
Second: The production, from the solid or crystallized cumidine referred to in the
preceding claim, of diazo-cumole or the sulpho acid of diazo-cumole, and the
use of these substances for the production of Azo-colors.
In witness whereof, I the said Charles Denton Abel have hereunto set my
hand and seal this twentieth day of February in the year of our Lord, one
thousand, eight hundred and eighty three.