IMPROVEMENTS IN THE MANUFACTURE OF COLORING MATTERS SUITABLE FOR DYEING AND PRINTING
Year: 1884

page_text: PROVISIONAL SPECIFICATION.
I, CHARLES DENTON ABEL of No 28 Southampton Buildings, Chancery Lane in
the county of Middlesex, Consulting Engineer and Patent Agent, do hereby declare
the nature of the said invention for "IMPROVEMENTS IN THE MANUFACTURE OF
COLORING MATTERS SUITABLE FOR DYEING AND PRINTING," to be as follows:-
This invention relates to the manufacture of azo-coloring matters suitable for
dyeing and printing from the amido-compounds of oxy-sulpho-benzide and its
derivatives; in carrying out the invention, I proceed, in the manner well known
to chemists, by first converting the diamido-oxy-sulpho-benzide or its derivatives
into the corresponding diazo-compound, and then allowing this body to act upon
aromatic phenols, phenolsulpho-acids, upon aromatic amines, imidos, or upon
tertiary bases.
ABEL & IMRAY,
Agents for the Applicant,
28, Southampton Buildings,
London, W.C.

page_text: COMPLETE SPECIFICATION.
I, CHARLES DENTON ABEL of No 28 Southampton Buildings, Chancery Lane, in
the county of Middlesex, Consulting Engineer and Patent Agent, do hereby declare
the nature of my invention for "IMPROVEMENTS IN THE MANUFACTURE OF
COLORING MATTERS SUITABLE FOR DYEING AND PRINTING" and in what manner
the same is to be performed to be particularly described and ascertained in and
by the following statement :-
This invention relates to the manufacture of azo-coloring matters suitable for
dyeing and printing from the amido-compounds of oxy-sulpho-benzide and its
derivatives; in carrying out the invention, I proceed, in the manner well known to
chemists, by first converting the diamido-oxy-sulpho-benzide or its derivatives into
the corresponding diazo-compound, and then allowing this body to act upon
aromatic phenols, phenolsulpho-acids, upon aromatic amines, imides, or upon
tertiary bases.
Before giving examples of the manner in which the new azo-coloring matters are
produced I will describe-
1, The process for producing diamido-oxysulpho-orthotoluide, one of the homo-
logues of the diamido-oxy-sulpho-benzide, and
2. The process for producing dibrome-diamido-oxysulpho-benzide, one of the
substitution products of the diamido-oxysulpho-benzide. For producing the first
named substance, two parts of ortho-kresol and one part of sulphuric acid are
heated on an oil bath to from 180° to 190° centigrade until á sample, on being
mixed with water forms a solid precipitate. The mass is then poured into water,
and the oxysulpho-orthotoluide, thus formed, collected on a filter and washed with
water; from this raw material which it is not necessary to purify any further,
1 produce the dinitro-oxysulpho-orthotoluide by boiling it with diluted nitric
acid. This nitro-compound, a yellowish powder dissolving in alkalies with yellow-
color, yields on being reduced with chlorido of tin, the diamido oxysulpho-ortho-
toluide, which is separated from the tin. in the usual manner. The hydrochlorate
of this base crystallises. out of water in long colorless needles. The substitution
products of the diamido-oxysulpho-benzide are best obtained by the reduction of
the corresponding nitro-compounds. The dibrome-diamido-oxysulpho-benzile, a
colorless base but sparingly soluble in water, for example, is obtained from
dibromo-dinitro-oxysulpho-benzide by treating this compound with chloride of tin
and hydrochloric acid or with another suitable reducing agent.
Production of the Coloring Matters.
First Example: 39 parts of hydrochlorate of diamido-oxysulpho-benzide in
dilute aqueous solution and after addition of the necessary quantity of hydro-
chloric acid, are converted into the diazo-compound in the usual manner by means
of nitrite of sodium. This diazo-compound I allow to flow into an alkaline solution
of 30 parts of betanaphthol, when the coloring matter will form instantaneously.
By the addition of hydrochloric acid, the coloring matter is precipitated, collected
on a filter and washed.

page_text: Second Exumple: 45 parts of hydrochlorate of diamido-oxysulpho-benzide are
converted into the diazo-compound in the manner described for the first example.
The diazo-compound brought into contact with an alkaline solution of 30 parts of
betanaphthol produces a very fine red azo-coloring matter.
It is well understood that in the place of betanaphthol other phenols, as well as
the sulpho-acids of phenols, aromatic amines, etc., etc., may be used.
The new azo-coloring matters produced according to this invention can be con-
verted into bisulphite compounds in the manner described in the specification to
patent No 5767 and be used for dyeing and printing as therein set forth.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is
The use for the production of azo-coloring matter in manner well known to
chemists of the diazo-compounds of
1, Dinmido-oxy-sulpho-benzide, its homologues and their methyl, ethyl and
amyl-ethers.
2, Dichloric-dibromic and di-iodic-diamido-oxysulpho-benzide and their methyl,
ethyl and amyl-ethers.
1002
ABEL & IMRAY,
Agents for the Applicant,
28, Southampton Buildings,
London, W.C.