Improvements in the Manufacture of Colouring Matters of the Safranine Series.
Year: 1898

page_text: Date of Application, 7th July, 1898
Complete Specification Left, 27th Mar., 1899-Accepted, 13th May, 1899
Improvements in the Manufacture of Colouring Matters of the
Safranine Series.
I, JOHN IMRAY, of Birkbeck Bank Chambers, Southampton Buildings, Chancery
Lane, in the County of London, Consulting Engineer and Chartered Patent Agent, do
hereby declare the nature of this invention (as communicated to me from abroad by
The Actien-Gesellschaft für Anilin-Fabrikation, of Berlin, in the Empire of
Germany, Chemical Manufacturers,) to be as follows:-
My foreign correspondents have discovered a new process for the production of
colouring matters of the safranine series, which consists in causing ammonia or
primary amines to react with the aposafraninesulpho-acids, which may be prepared
by treating aposafranines with sulphites or bisulphites.
The sulpho-group contained in these aposafranines is eliminated in this process
in the form of sulphurous acid, the imido-group, substituted or not, entering into
its place.
The process
is generally carried out by heating the aposafraninesulpho-acids with
ammonia or primary amines or diamines in an open or closed vessel, with or
without addition of a suitable solvent. The following example may illustrate the
new process.
9 kilos. of the isorosindulinesulphonic acid possessing the following constitution:
(obtained by the action of a sulphite on the aposafranine prepared from nitroso-
20 diethylaniline and phenyl-ẞ-naphthylamine), 90 kilos. of alcohol and 3 kilos. of
para-phenylene-diamine are heated to boiling in a reflux apparatus. As soon as the
isorosindulinesulpho-acid has dissappeared; the alcohol is distilled off and the colouring
Paine 1
3

page_text: matter which has been produced is precipitated from its aqueous solution by means
of salt.
It dves tannin-mordanted cotton a greenish-blue.
ABEL & IMRAY,
Agents for the Applicant.
Improvements in the Manufacture of Colouring Matters of the
Safranine Series.
I, JOHN IMRAY, of Birkbeck Bank Chambers, Southampton Buildings, Chancery
Lane, in the County of London, Consulting Engineer and Chartered Patent Agent,
do hereby declare the nature of this invention (as communicated to me from abroad
by The Actien-Gesellschaft für Anilin-Fabrikation, of Berlin, in the Empire of Ger-
many, Chemical Manufacturers,) and in what manner the same is to be performed to
be particularly described and ascertained in and by the following statement :-
My foreign correspondents have discovered a new process for the production of
colouring matters of the safranine series, which consists in causing ammonia or primary
amines to react with the aposafraninesulphonic-acids, which may be prepared by treating
aposafranines with sulphites or bisulphites. The sulphonic-group contained in these
aposafranines is eliminated in this process in the form of sulphurous acid, the imido-
group, substituted or not, entering into its place.
The process is generally carried out by heating the aposafraninesulphonic acids with
ammonia or primary amines or diamines in an open or closed vessel, with or without
addition of a suitable solvent. The following examples may illustrate the new
process.
(obtained by the action of a sulphite on the aposafranine prepared from nitrosodi-
ethylaniline and phenyl-ẞ-naphthylamine), 90 kilos. of alcohol and 3 kilos. of para-
phenylenediamine are heated to boiling in a reflux apparatus. As soon as the
isorosindulinesulphonic acid has disappeared, the alcohol is distilled off, the colouring
matter is dissolved in diluted hydrochloric acid and is precipitated from the solution
by means of common salt.
It dues tannin-mordanted cotton a greenish-blue.

page_text: 5 are heated with 100 kilos. of alcohol and 20 kilos. of concentrated ammonia during
four hours in a closed vessel at about 150° C. The alcohol is then distilled off, the
colouring matter is dissolved in diluted hydrochloric acid and precipitated from the
solution by means of common salt. It is identical with the dyestuff described in
Example I, of the Specification No. 24410 of 1897.
are heated with 20 kilos. of aniline up to 120° C. until no more sulphurous acid is
developed. The aniline is then removed in the usual way, the colouring matter is
converted into its hydrochloride which is precipitated from its aqueous solution by
means of common salt. It dyes tannin-mordanted cotton blue violet shades.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is:-
1. Manufacture of colouring matters of the safranine series by tresting with

page_text: ammonia or primary amines the aposafranine sulphonic acids obtained by the action
of sulphites or bisulphites on aposafranines.
2. The colouring matters of the safranine series manufactured as herein set forth.
ABEL & IMRAY,
Agents for the Applicant.