IMPROVEMENTS IN THE MANUFACTURE OF COLOURING MATTERS SUITABLE FOR DYEING AND PRINTING
Year: 1883

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 to him from abroad by Carl Rumpff of Elberfeld
in the Empire of Germany Manufacturing Chemist
PROVISIONAL SPECIFICATION left by the said John Erskine at the Office,
of the Commissioners of Patents on the 12th May 1883.
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 to him from
abroad by Carl Rumpff of Elberfeld in the Empire of Germany Manufacturing:
Chemist]
In the Specification filed in pursuance of Letters Patent granted to Joseph
Anthony Dixon, of Glasgow, as a communication from the aforesaid Cari Rumpff,.
N° 1225, A.D. 1881, there is described the process of preparing the neutral sodium
salts of the mono-sulpho-acid of the alpha-mono-sulpho-acid of Beta-napthol.-In
the said Specification there is also described the process of preparing new dye stuffs
by letting this salt act on Diazo compounds.
Under the present improvements the new alpha-mono-sulpho-acid appears in its
formation in inixture with the old or Beta-mono-sulpho-acid which is well known
and has been described by Schaeffer as stated in the aforesaid Specification of the
said Joseph Anthony Dixon and the two sodium potash lime or other salts also
appear in mixture.
In the aforesaid Specification N° 1225, A.D. 1881, it is then further mentioned
that these two acids can be easily separated by boiling the mixture of the two
salts with. alcohol,-the salta being previously dried by evaporation; the reason
for this being that the old mono-sulpho-acid of Schaeffer does not dissolve in the
alcohol, whilst the new alpha-mono-sulpho-acid does easily dissolve in the alcohol,

page_text: and therefore after boiling the mixture with alcohol, the insoluble mono-sulpho-
acid of Schaeffer is easily separated from the new alpha-mono-sulpho-acid by
filtration..
The present Invention consists of another method of separating these two
isomeric mono-sulpho-acids which hitherto after the aforesaid process have been
formed together, that is to say, unseparated.
The new method of separation of these two isomeric mono-sulpho-acids rests on
the fact that the old mono-sulpho-acid of the Beta-napthol of Schaeffer move easily
and quickly, forms a chemical combination with several Diazo compounds than is
the case with the new alpha-mono-sulpho-acid.
According to the present Invention then such Diazo compounds are used for
effeeting the separation of the two mono-sulpho acids and for this purpose Diazo-
Benzoles, Diazo-Toluols,. Diazo-Xylols, Diazo-Napthylins or their homologues are
employed.
The process consists as follows:-a liquid solution of the mixture of the two
salts herein before mentioned obtained in the manner described in the aforesaid
Specification No 1225, A.D. 1881, is tested carefully in order to ascertain the exact
quantity of the old mono-sulpho-acid of Schaeffer contained therein.-This being
ascertained by well known chemical means it is at once easily calculated how
much of one of the aforesaid Diazo compounds will be necessary to absorb the
Schaeffer's mono-sulpho acid contained in the solution.-To the said solution which
contains the salts of the two mono-sulpho acids which have to be made sufficiently
alkaline one of the hereinbefore named. Diazo compounds is then added in the
proportion as found in the aforesaid test and the whole is then well stirred
together..
It may be observed that it is not altogether injurious to add a surplus of the
Diazo compound but it is not advisable for the reason that as soon as all the
Schaeffer's mono-sulpho-acid is Diazotised the surplus of Diazo-Benzol, Diazo-
Toluol, Diazo-Xylol, Diazo-Napthalin or their homologues which has been used for
the purpose will also bind part of the new mono-sulpho-acid which will prove a
loss. It is also not desirable to use less of the Diazo compounds than will unite
with the old or Schaeffer mono-sulpho-acid because in that case part of the
Schaeffer mono-sulpho-acid would remain free and the result when using the rest
of the mixture would be to produce a crocein colour less pure than would result
from the pure new alpha-mono-sulpho-acid of Beta-Napthol.
After the aforesaid mixture is made by adding salt water or other precipitating
agent to it the colour formed by the Diazotising of the Schaeffer-mono-sulpho-acid
precipitates and is easily separated from the other liquid. by filtration.-The new
alpha-mono-sulpho-acid remains in the solution..
For the purpose of further treating the new alpha-mono-sulpho-acid which may
be either concentrated by evaporation or used in a more diluted state the process
described in the aforesaid Specification N° 1225, A.D. 1881, is used, the only
difference being that according to the present Invention we can avoid the drying
of the salt and directly work with the watery solution..

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said John Erskine in the Great Seal Patent Office on the 9th November
1883.
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 to me from
abroad by Carl Rumpff of Elberfeld in the Empire of Germany Manufacturing
Chemist
In the Specification filed in pursuance of Letters Patent granted to Joseph.
Anthony Dixon of Glasgow, as a communication from the aforesaid Carl Rumpff
No 1225 A D, 1881, there is described the process of preparing the neutral sodium
salts of the alpho-mono-sulpho-acid of Beta-napthol.-In the said Specification
there is also described the process of preparing new dye-stuffs by letting this salt
act on Diazo compounds.
Under the present improvements the new alpha-mono-sulpho acid appears in its
formation in mixture with the old or Beta-mono-sulpho-acid which is well known
and has been described by Schaeffer as stated in the aforesaid Specification of the;
said Joseph Anthony Dixon and the two sodium, potash, lime or other salts also.
appear in mixture
In the aforesaid Specification No 1225, A.D. 1881, it is therein further mentioned,
that these two acids can be easily separated by boiling the mixture of the two salts:
with alcohol, the salts being previously dried by evaporation the reason for this
being that the old mono-sulpho acid of Schaeffer does not dissolve in the alcohol,
whilst the new alpha-mono-sulpho acid does easily dissolve in the alcohol, and
therefore after boiling the mixture with alcohol the insoluble mono-sulpho acid of
Schaeffer is easily separated from the new alpha-mono-sulpho acid by filtration.
The present invention consists of another method of separating these two.
isomeric mono-sulpho acids which hitherto after the aforesaid process have been.
found together, that is to say, unseparated.
The new method of separation of these two isomeric mono-sulpho acids rests on
the fact that the old mono-sulpho acid of the Beta napthol of Schaeffer more easily
and quickly forms a chemical combination with several Diazo compounds than is
the case with the new alpha-mono-sulpho acid.
According to the present Invention, then, such Diazo compounds are used for
effecting the separation of the two mono-sulpho acids and for this purpose Diazo-
Benzoles, Diazo-Toluols, Diazo-Xylols, Diazo-Napthalines or their homologues are
employed.
The process consists as follows:-A liquid solution of the mixture of the two
salts hereinbefore mentioned obtained in the manner described in the aforesaid
Specification No 1225 A.D. 1881, is tested carefully in order to ascertain the exact
quantity of the old mono-sulpho acid of Schaeffer contained therein.-This being
ascertained by well known chemical means, it is at once easily calculated how
much of one of the aforesaid Diazo compounds. will be necessary to absorb the
Schaeffer's mono-sulpho acid contained in the solution.-To the said solution which
contains the salts of the two mono-sulpho acids which have to be made sufficiently
alkaline, one of the herein before named Diazo compounds is then added in the
proportion as found in the aforesaid test, and the whole is then well stirred
together.
It may be observed that it is not altogether injurious to add a surplus of the
Diazo compound, but it is not advisable, for the reason that as soon as all the

page_text: Schaeffer's mono-sulpho acid is diazotised, the surplus of Diazo-Benzol, Diazo-
Toluol, Diazo-Xylol, Diazo-Napthaline or their homologues which have been used
for the purpose will also bind part of the new mono-sulpho acid which will prove
a loss. It is also not desirable to use less of the Diazo compounds than will unite
with the old or Schaeffer mono-sulpho acid because, in that case, part of the
Schaeffer mono-sulpho acid would remain free and the result when using the rest
of the mixture would be to produce a crocëin colour less pure than would result
from the pure new alpha-mono-sulpho acid of Beta-napthol.
After the aforesaid mixture is made by adding salt water or other precipitating
agent to it, the colour formed by the diazotising of the Schaeffer mono-sulpho acid
precipitates and is easily separated from the other liquid by filtration.-The new
alpha-mono-sulpho acid remains in the solution.
For the purpose of further treating the new alpha-mono-sulpho acid which may
be either concentrated by evaporation or used in a more diluted state, the process
described in the aforesaid Specification N° 1225 A D. 1881, is used, the only
difference being that according to the present invention the drying of the salt is
avoided and it can be directly worked with the watery solution.
Having now described and particularly ascertained the nature of the said
Invention, and the system mode or manner in or under which the same is or may
be used or practically carried into effect it is to be observed in conclusion that
what is considered to be novel and original and therefore claimed as the Invention
secured by the hereinbefore in part recited Letters Patent is
First. The Separation of the old isomeric mono-sulpho acid of the Beta-Naptho!
of Schaeffer from the new isomeric alpha-mono-sulpho acid of Beta Napthol
described in the aforesaid Specification N° 1225 A.D. 1881, produced in mixture
with it, by the action of Diazo-benzol, Diazo-Toluol, Diazo-Xylol, Diazo-Napthaline
or their homologues or any of them on the watery and alkaline solution of both
salts, all in manner herein before described.
Second. The formation of colouring matter by the action of the said Diazo
compounds or their homologues or any of them on the alkaline mixture of the
said old Isomeric mono-sulpho acid of the Beta Napthol of Schaeffer and the said
new isomeric alpha-mono-sulpho acid of Beta Napthol in so far as the action of
the said Diazo compounds or their homologues or any of them affects the isomeric
mono-sulpho acid of the Beta Napthol of Schaeffer contained in the mixture, all in
manner hereinbefore described.
Third. The application of the separating process claimed by the preceding Claim
number one hereof to and in the colour-making processes described in the aforesaid
Specification N° 1225 A.D. 1881.
In Witness Whereof, I, the said John Erskine have hereunto set my hand and
seal this third day of November in the year of Our Lord One thousand eight
hundred and eighty-three