IMPROVE- MENTS IN THE PRODUCTION OF COLORING MATTERS
Year: 1881

page_text: LETTERS PATENT to Charles Denton Abel, of No. 28, Southampton Buildings,
Chancery Lane, in the County of Middlesex, for an Invention of "IMPROVE-
MENTS IN THE PRODUCTION OF COLORING MATTERS." A communication from
abroad by Messrs. Bindschedler and Busch, of Basle, in the Republic of
Switzerland.
PROVISIONAL SPECIFICATION left by the said Charles Denton Abel at the
Office of the Commissioners of Patents on the 4th March 1881.
CHARLES DENTON ABEL, of No. 28, Southampton Buildings, Chancery Lane, in
the County of Middlesex. "IMPROVEMENTS IN THE PRODUCTION OF COLORING
MATTERS." [A communication from abroad by Messrs. Bindschedler and Busch, of
Basle, in the Republic of Switzerland.]
This Invention relates to the production of coloring matters by the action of
the halogenes upon the azo-derivatives of resorcine.
The process for this purpose consists,―
I. In the preparation of the azoderivatives.
II. In the action of the halogenes upon the azoderivatives.
I.
0. Example for the pronaration of the
ARA dominations
a. Example for the properation of the are derivatives of resereine by direct
azotising of the resorcine.
To 5 parts by weight of sulphuric acid having admixture of 4 per cent. of nitrous
acid is added one part of resorcine; the solution is heated to 100° centigrade, and
the azobody formed is precipitated by water.
b. Example for the preparation of the azoderivatives by the action of nitroso-
compounds of the phenoles on resorcine.
10 kilogrammes (22 lbs.) of resorcine are dissolved in 90 litres (158.5. pints) of
alcohol and treated with as much soda lye as is necessary for the formation of
[Price 4d.]

page_text: mono-sodium resorcine, and 10 kilogrammes (22 lbs.) of amylnitrite are added. The
separated nitroso sodium compound is mixed in a dry state with half the weight of
resorcine, then added to ten parts by weight of concentrated sulphuric acid, and
heated for about one hour to 100° cent., whereupon the substance resulting from the
reaction is precipitated by water.
In example Ib there may be substituted for the nitrosoresorcine other nitroso
ompounds of the. phenoles, such as nitrosophenole.
Treatment of the azoderivatives with the halogenes.
The respective azoderivatives in solution or in suspension are subjected to the
action of halogenes.
In order, for example, to produce the bromine derivatives the following process
may be employed :-
The azoderivatives are dissolved in diluted soda-lye, treated with an alkaline
bromine solution, and upon then acidulating the solution the coloring matter is
precipitated.
By converting the said coloring matter into the potash or soda salts they are
rendered available for trade.
The product of the bromine reaction from azoderivatives produced according to
I a or Ib forms, for example, a coloring matter, varying from blue-violet to blue,
with beautiful red fluorescence.

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 14th
June 1881.
CHARLES DENTON ABEL, of No. 28, Southampton Buildings, Chancery Lane, in
the County of Middlesex. "IMPROVEMENTS IN THE PRODUCTION OF COLOURING
MATTERS." A communication from abroad by Messrs. Bindschedler and Busch, of
Basle, in the Republic of Switzerland.
TL
VISING
To 5 parts by weight of sulphuric acid having admixture of 4 per cent. of nitrous
acid is added one part of resorcine; the solution is heated to 100° centigrade, and
the azobody formed is precipitated by water.
b. Example for the preparation of the azo-derivatives by the action of nitroso-
compounds of the phenoles on resorcine.
10 kilogrammes (22 lbs.) of resorcine are dissolved in 90 litres (158.5 pints) of
alcohol, and treated with as much soda lye as is necessary for the formation of
mono-sodium-resorcine, and 10 kilogrammes (22 lbs.) of amylnitrite are added.
The separated nitroso-sodium compound is mixed in a dry state with half the
weight of resorcine, then added to 10 parts by weight of concentrated sulphuric
acid, and heated for about one hour to 100° centigrade, whereupon the substance
resulting from the reaction is precipitated by water.
In example I b there may be substituted for the nitroso-resorcine other nitroso-
compounds of the phenoles, such as nitrosophenole.
Treatment of the azo-derivatives with the halogenes.
The respective azo-derivatives in solution or in suspension are subjected to the
action of the halogenes.
In order, for example, to produce the bromine derivatives the following process
may be employed :-
--
The azoderivatives are dissolved in diluted soda-lye treated with an alkaline
bromine solution, and upon then acidulating the solution the colouring matter is
precipitated.
By converting the said colouring matter into the potash or soda salts they are
rendered available for trade.
The product of the bromine reaction from azoderivatives produced according to
Ia or Ib forms, for example, a colouring matter varying from blue-violet to blue,
with beautiful red fluorescence.
Having thus described the nature of the said Invention, and in what manner
the same is to be performed, as communicated to me by my foreign correspondent,
I claim,

page_text: The production of colouring matters by the action of the halogenes upon the
azo-derivatives of resorcine.
In witness whereof, I, the said Charles Denton Abel, have hereunto set my
hand and seal, this Fourteenth day of June, in the year of our Lord One
thousand eight hundred and eighty one.
CHA. D. ADEL.
(L.S.)