IMPROVEMENTS IN THE PRODUCTION OF THE SULPHO-ACIDS OF ROSANILINE AND OF THE COLORING MATTERS DERIVED THEREFROM, AS ALSO OF ALIZARINE AND PURPURINE
Year: 1879

page_text: LETTERS PATENT to Charles Denton Abel, of Southampton Buildings, Chancery
Lane, in the County of Middlesex, for the Invention of "IMPROVEMENTS IN THE
PRODUCTION OF THE SULPHO-ACIDS OF ROSANILINE AND OF THE COLORING
MATTERS DERIVED THEREFROM, AS ALSO OF ALIZARINE AND PURPURINE"
A communication from abroad by Emil Jacobsen, of Berlin, in the German
Empire.
Sealed the 19th December 1879, and dated the 11th July 1879.
PROVISIONAL SPECIFICATION left by the said Charles Denton Abel at
the Office of the Commissioners of Patents on the 11th July 1879.
CHARLES DENTON ABEL, of Southampton Buildings, Chancery Lane, in the
County of Middlesex. "IMPROVEMENTS IN THE PRODUCTION OF THE SULPHO-
ACIDS OF ROSANILINE AND OF THE COLORING MATTERS DERIVED THEREFROM,
AS ALSO OF ALIZARINE AND PURPURINE." [A communication from abroad by
Emil Jacobsen, of Berlin, in the German Empire.]
The production of the sulpho-acids of rosaniline, and the violet and blue derivates
thereof is, as is well known, attended with difficulties because the action of sul-
phuric acid takes place either too violently or with too little energy.
These difficulties can be overcome by replacing the sulphuric acid by sulphuric-
monochlorhydrine. The action of this compound on the said coloring matters is
energetic and yet easily to be controlled. For producing the sulpho-acids in
question on a manufacturing scale I proceed as follows:
:-
Equivalent quantities of the dried bases rosaniline or its compounds with methyle,
ethyle, phenyle, and benzyle, or of alizarine, or purpurine are gradually introduced
into equivalent quantities of the sulphuric-monochlorhydrine which is contained in
a closed vessel furnished with a stirrer and an outlet for the hydrochloric gas, and
which is cooled with cold water. The formation of the sulpho-acids takes place for
the most part almost instantaneously during this operation. After having intro-
duced the whole quantity of the base the reaction is brought to an end by heating
in a water bath to about 100° C. The raw sulpho-acid thus obtained is
then cautiously introduced into a large excess of cold water, the mixture
heated to boiling and neutralised with lime. The precipitated sulphate of lime is
separated by a filter press, and the filtered solution evaporated to dryness and
purified or transformed into other salts in the usual way. In place of the free
bases also their salts, as for instance, the chlorides may be employed; also the
combination with bromine corresponding to sulphuric monochlorhydrine, namely,
the sulphuric-monobromhydrine may be employed.

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 7th
January 1880.
CHARLES DENTON ABEL, of Southampton Buildings, Chancery Lane, in the
County of Middlesex.: "IMPROVEMENTS. IN. THE PRODUCTION OF THE SULPHO-
ACIDS OF ROSANILINE AND OF THE COLOURING MATTERS DERIVED THEREFROM,
AS ALSO OF ALIZARINE AND PURPURINE." A communication from abroad by
Emil Jacobsen, of Berlin, in the German Empire.
The production of the sulpho-acids of rosaniline, and the violet and blue derivatives
thereof, is, as well known, attended with difficulties, because the action of sul-
phuric acid takes place either too violently or with too little energy. These
difficulties can be overcome by replacing the sulphuric acid by sulphuric mono-
chlorhydrine. The action of this compound on the said coloring matters is energetic,
and yet easily to be controlled. The sulpho-acids in question are produced on a
manufacturing scale as follows:―
One part of the dried base rosaniline or its compounds with methyle, ethyle,
phenyle, and benzyle, or of alizarine or purpurine is gradually introduced into
about 3-4 parts of the sulphuric monochlorhydrine which is contained in a closed
vessel furnished with a stirrer and an outlet for the hydrochloric gas, and which is
cooled with cold water. The formation of the sulpho-acids takes place for the
inost part almost instantaneously during this operation. After the whole quantity
of the base has been introduced the reaction is brought to an end by heating in a
water bath to about 100° C. The raw sulpho-acid thus obtained is then cautiously
introduced into a large excess of cold water, the mixture is heated to boiling and
neutralised with lime. The precipitated sulphate of lime is separated by a filter
press and the filtered solution evaporated to dryness and purified or transformed into
other salts in the usual way. In place of the free bases also their dried salts, as for
instance, the chlorides may be employed, also the combination with bromine cor-
responding to the sulphuric monochlorhydrine, namely, the sulphuric-monobrom-
hydrine may be employed.
Having thus described the nature of this Invention, and in what manner the
same is to be performed, as communicated to me by my foreign correspondent, I
claim,―
First. In processes for producing the sulpho-acids of rosaniline or its compounds
with methyle, ethyle, phenyle, and benzyle, as also of alizarine and purpurine, the
use of sulphuric monochlorhydrine or of sulphuric monobromhydrine as the re-agent
instead of sulphuric acid.
Second. The herein described process-for-producing the sulpho-acids referred to
in the preceding claim.
In witness whereof, I, the said Charles Denton Abel, have hereunto set my
hand and seal, this Seventh day of January, in the year of our Lord One
thousand eight hundred and eighty.
CHAº. D. ABEL.
(L.S.)