IMPROVE- MENTS IN THE PRODUCTION OF COLORING MATTERS
Year: 1881

page_text: LETTERS PATENT to Charles Denton Abel, of No. 28, Southampton,
Chancery Lane, in the County of Middlesex, for an Invention of "IMPROVE-
MENTS IN THE PRODUCTION OF COLORING MATTERS." A communication
from abroad by Carl Alexander Martius, of the Actien Gesellschaft fuer Anilin
.
PROVISIONAL SPECIFICATION left by the said Charles Denton Abel at the
Office of the Commissioners of Patents on the 22nd February 1881.
CHARLES DENTON ABEL, of No. 28, Southampton, Chancery Lane, in the
County of Middlesex. "IMPROVEMENTS IN THE PRODUCTION OF COLORING
MATTERS." [A communication from abroad by Carl Alexander Martius, of the
Actien Gesellschaft fuer Anilin Fabrikation, of Berlin, in the German Empire.]
The non-crystallising portions of the hydrocarbons contained in coal-tar which
boil between 225° and 250° centrigrade consist principally of methyle- and dime-
thyle-napthaline substances which up to the present time have not been employed
for the manufacture of colors.
According to the present Invention orange, red, and brown coloring matters are
produced from these hydrocarbons or mixtures thereof (which I will call generally
methylenaphthaline) by the following processes :———
1. Methylenaphthaline is converted by nitric acid into nitromethylenaphthaline.
2. Nitromethylenaphthaline is then converted by heating with sulphuric acid into
the sulfoacid of nitromethylenaphthaline.
3. This sulfoacid of nitromethylenaphthaline is then reduced by treating it with
zinc or iron and hydrochloric acid into the sulfoacid of amidomethylenaphthaline.
Instead of converting the nitromethylenaphthaline into the sulfo-acid, the nitro-
methylenaphthaline may first be converted into amidomethylenaphthaline, and then
converted into the sulfoacid.

page_text: 4. The sulfoacid of amidomethylenaphthaline is then converted in the ordinary
way with nitrite of soda into the sulfoacid of diazomethylenaphthaline.
This diazo-compound combined with betanaphthole, or with the sulfo acid of
betanaphthole in alkaline solution yields in the well known way azocolors, which
separated from their solutions by chloride of sodium can be used directly for dyeing
and printing.

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
19th August 1881.
.
CHARLES DENTON ABEL, of No. 28, Southampton Buildings, Chancery Lane,
in the County of Middlesex. "IMPROVEMENTS IN THE PRODUCTION OF COLORING
MATTERS." A communication from abroad by Carl Alexander Martius, of the
Actien Gesellschaft fuer Anilin Fabrikation, of Berlin, in the German Empire.
The non crystallizing portions of the hydrocarbons contained in coal-tar which
boil between 225 and 250° cent. consist principally of methyle and dimethyle-
naphthaline substances which up to the present time have not been employed for
the manufacture of colours.
According to the present Invention orange, red, and brown coloring matters are
produced from these hydrocarbons or mixtures thereof (which I will call generally
methylenaphthaline) by the following processes :—
1. Methylenaphthaline is converted by nitric acid into nitromethylenaphthaline.
2. Nitromethylenaphthaline is then converted by heating with sulphuric acid into
the sulfo acid of nitromethylenaphthaline.
3. This sulfoacid of nitromethylenaphthaline is then reduced by treating it with
zinc or iron and hydrochloric acid into the sulfoacid of amidomethylenaphthaline.
Instead of converting the nitromethylnaphthaline into the sulfoacid, the nitro-
methylenaphthaline may first be converted into amidomethylenaphthaline and then
converted into the sulfoacid.
4. The sulfoacid of a amidomethylenaphthaline is then converted in the ordinary
way with nitrite of soda into the sulfoacid of diazomethylenaphthaline.
This diazocompound combined with betanaphthole or with the sulfoacid of
betanaphthole in alcaline solution yields in the well known way azocolours, which
separated from their solutions by chloride of sodium can be used directly for dyeing
and printing.

page_text: Second. The production of orange, red, and brown coloring matter by combining
methylenaphthole or its sulfoacids with diazobenzole, diazoxylole, diazocumole,
diazonaphthaline or diazomethylenaphthaline or their sulfoacids.
In witness whereof, I, the said Charles Denton Abel, have hereunto set my
hand and seal, this Nineteenth day of August in the year of our Lord
One thousand eight hundred and eighty one.
CITAS D ADRI
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D. ADENT