IMPROVEMENTS IN THE MANUFACTURE OF COLOURING MATTERS SUITABLE FOR DYEING AND PRINTING
Year: 1882

page_text: LETTERS PATENT to John Erskine of 151 St Vincent Street Glasgow in the
County of Lanark North Britain, Solicitor for an invention of IMPROVEMENTS
IN THE MANUFACTURE OF COLOURING MATTERS SUITABLE FOR DYEING AND
PRINTING A communication from abroad by the Farbwerke vorm: Meister,
Lucius and Brüning of Hoechst-am-Main in the Empire of Germany a
Company carrying on business as Chemical Manufacturers
(Void by reason of the Patentee having neglected to file a Specification in
pursuance of the conditions of the Letters Patent.)
PROVISIONAL SPECIFICATION left by the said John Erskine at the Office
of the Commissioners of Patents on the 12th April 1882.
JOHN ERSKINE of 151 St Vincent Street, Glasgow, in the County of Lanark,
North Britain, Solicitor, "IMPROVEMENTS IN THE MANUFACTURE OF COLOURING
MATTERS SUITABLE FOR DYEING AND PRINTING,"-[A communication from abroad
by the Farbwerke vorm: Meister, Lucius and Brüning of Hoechst-am-Main in the
Empire of Germany a Company carrying on business as Chemical Manufacturers.]
The nature of this Invention is the manufacture of colouring matters suitable
for dyeing and printing from the acetylised aromatic amido acids or mixtures which
yield them, by heating the said acids or mixtures with dehydrating agents.
I have found, that in all cases where colouring matters can be produced from
acetylised aromatic bases by dehydrating agents as described in the Provisional
Specification filed by Joseph Anthony Dixon No 5427 A.D. 1881, these bascs can
be replaced by their carboxyl substitution products without any change, or any
material change, in the result. Thus, for example, the three mono-acetylamido-
benzoic acids yield colouring matter indentical, or nearly identical, with the
colouring matter which is obtained from acetanilide. If the easy decomposition
of the amidobenzoic acids into aniline and carbonic acid is taken into consideration,
it is not surprising that the colouring matters should be the same as I believe
them to be,

page_text: I proceed to give, as an illustration of the mode in which this Invention is to bo
carried into operation, the new process for producing the Flaraniline" which is
the name I have chosen for the colouring matter produced from acetanilide, and
which also attach to the colouring matter produced by the new process, from tho
corresponding acetylised amido benzoic acids.-A mixture of equal parts of mono-
acetylamido benzoic acid (all three isomeric compounds are suitable) and chloride
of zinc are heated for several hours at about 482 Fahrenheit (250° Centigrade).-
The dark coloured smelt which forms is first separated from the Chloride of zinc
by boiling with water, the colour base is afterwards extracted from the remaining
tarry, or resinous, matter by muriatic acid, and finally the colouring matter is
precipitated from the solution of it thus obtained by an addition of common salt
to the same.
It is a matter of course, that instead of monoacetylamidobenzoic acid I can use
all those mixtures which are apt to form this acid, for example a mixture of glacial
acetic acid, or of acetylchloride, or of acetic-acid-anhydride, with amidubenzoic
acid, or of acetate of zinc-oxide with hydrochlorate of amido-benzoic acid, and there
are many other mixtures of the saine sort, which will readily occur to chemists, the
components of which by their mutual reaction will yield carboxylized compounds, or
derivatives, of acetylised aromatic basos.