IMPROVEMENTS IN THE MANUFACTURE OF CERTAIN SULPHO ACIDS
Year: 1883

page_text: LETTERS PATENT to Frank Wirth of the firm of Wirth and Company, Patent
Solicitors at Frankfort on the Main, in the Empire of Germany for an
Invention of IMPROVEMENTS IN THE MANUFACTURE OF CERTAIN SULPHO ACIDS
a communication from the Farbfabrik vormals Brönner" of Frankfort on
the Main in the Empire of Germany
PROVISIONAL SPECIFICATION left by the said Frank Wirth at the Office
of the Commissioners of Patents on the 23rd July 1883.
FRANK WIRTH of the firm of Wirth and Company, Patent Solicitors at Frankfort
on the Main in the Empire of Germany "IMPROVEMENTS IN THE MANUFACTURE
OF CERTAIN SULPHO ACIDS." [a communication. from the Farbfabrik vormals
"Brönner of Frankfort on the Main in the Empire of Germany]
"
This Invention relates to a process for the preparation of betanaphthol sulpho
acids from betadinaphthylether
The process is based on the fact that the bye product resulting in the inanufacture
of naphthol, namely, betadinapthylether (Co H₁ U) when acted on by sulphurising
agents (concentrated sulphuric acid, anhydrite, pyrosulphate, etc, etc) at a high
temperature yields sulpho acids of the betanaphthol.
The reaction involved in the case of betanaphtholdisulpho acid is according to
the fallaming formala ·

page_text: The betanaphthodisulpho acids are produced by heating 1 part of betadinaphthyl-
ether to a temperature of from 100° to 120° C for from 5 to 6 hours with 3 parts
of oleum containing 10 per cent of the anhydride and afterwards adding 2 parts of
oleum containing 45 per cent of the anhydride and heating the whole for 3 or
4 hours at a temperature of from 140° to 150° C.
The betanaphthosulpho acids obtained by this method are just as suitable for
the manufacture of dyes as those made direct from betanaphthol.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
1 the said Frank Wirth in the Patent Office on the 19th January 1884.
FRANK WIRTH of the firm of Wirth and Company, Patent Solicitors at Frankfort
on the Main in the Empire of Germany. "IMPROVEMENTS IN THE MANUFACTURE
OF CERTAIN SULPHO-ACIDS." A communication from the Farbfabrik vormals
"Brönner" of Frankfort on the Main in the Empire of Germany
3
This Invention relates to a process for the preparation of betanaphthol sulpho
acids from betadinaphthylether. The process is based on the fact that the bye
product resulting in the manufacture of naphthol, namely, betadinapthylether
(CHO) when acted on by sulphurising agents (concentrated sulphuric acid,
anhydrite, pyrosulphate, etc, etc,) at a high temperature yields sulpho acids of the
betanaphthol.
The reaction involved in the case of betanaphtholdisulpho acid is according to
the following formula :—
B CHO+ 4 H₂ SO₁ 23 C, H, OH (SO, H), + 3 H, O.
2
Betadinaphthylether
Betanaphthodisulpho acids.
For instance, as regards betanaphthomonosulpho acids:-1 part of betadinaphthyl-
ether is heated with from two to three parts of concentrated sulphuric acid of
66° Beaumé at a temperature of from 90° to 100° Centigrade until a sample of the
mass dissolves in water to a clear solution.
To prepare betadisulpho acids, 1 part of betadinaphthylether is heated at a
temperature of from 110° to 120° C. for from 5 to 6 hours with 3 parts of oleum
containing about 10 per cent of the anhydride.
The betanaphthodisulpho acids are produced by heating one part of beta-
dinaphthylether to a temperature of from 100° to 120° C. for from 5 to 6 hours
with 3 parts of oleum containing 10 per cent of the anhydride and afterwards
adding 2 parts of oleum containing 45 per cent of the anhydride and heating the
whole for 3 or 4 hours at a temperature of from 140° to 150° C.
The betanaphthosulpho acids obtained by this method are just as suitable for the
manufacture of dyes as those made direct from betanaphthol.
Having described the nature of the said Invention and the manner of performing

page_text: the same, I declare that what I claim as the Invention to be protected by the
hereinbefore in part recited Letters Patent is
.
The preparation of Beta Naphthol-sulpho-acids by the action of sulphurising
agents on Beta Dinaphthylether.
In Witness whereof I the said Frank Wirth have hereunto set my hand and
seal this sixteenth day of January, A.D. 1884.
FRANK WIRTHT