Year: 1887

page_text: Date of Application, 8th June, 1887
Complete Left, 5th Mar., 1888.
Complete Accepted, 13th Apr., 1888
1, SYDNEY PITT of Sutton in the County of Surrey Gentleman (a communication
to me from Leopold Cassella and Company of Frankfort-on-Main, in the Empire of
Germany Manufacturing Chemists,) do hereby declare the nature of this invention to
be as follows:-
I have found that the ẞ naphtolmonosulphonic acid F described in the Provisional
Specification of October 9th 1886 No. 12908. can be transformed by further
sulphonation into a new disulphonic acid which I name ẞ naphtol ♪ disulphonic
acid.
In order to obtain this new acid I proceed as follows:-I introduce 50 kilos of
F naphtolmonosulphonate of soda into 100 kilos sulphuric acid of 66° Bé. at 120-
140° C. and keep the temperature at 120° C. until a sample combined with diazo-
naphtaline produces a claret red, which is of bluer shade than the known Bordeaux R.
The operation lasts about 12 hours.
In place of the sulphuric acid of 66° Bé. weaker acids may be used. When fuming
sulphuric acid is used or other sulphonating agents (pyrosulphate &c.) the temperature
is kept at a lower point and the sulphonation is sooner terminated.
The melt diluted with water is saturated with lime, and the lime-salt is transformed
by addition of soda to the filtered solution into the sodium salt. The latter is easily
soluble in water, difficulty in spirit-the aqueous solution has a greenish fluorescence,
the solution can be used directly for the production of azo colours. If however the
acid is to be separated in form of a pure combination, it is best to use the barium salt
which is very difficultly soluble in boiling water. For this purpose I mix the sodium
salt with a solution of an equivalent quantity of chlorhydrate of barium, heat to the
boil and filter the separated yellowish white salt of baryta.
The known ẞ naphtoldisulphonic acids are not formed in sulphonating the acid F.
Compared with the disulphonic acid known as acid R the acid & shows the same
differences, as the acid F compared with the ẞß naphtolmonosulphonic acid of Schaeffer.
Diazonaphtaline and acid & for instance produce a violet crystalline precipitate, whilst
diazonaphtaline and acid R produce a brownish-red, voluminous precipitate. The

page_text: so-called acid G-in its pure state named acid y-does not as is known, combine with
diazonaphtaline in aqueous solution.
"
The barium salt of the acid 8 dissolves in 185 times its quantity of boiling water
and crystallizes in small prisms of the formula.
OH
Co H, (SO), Ba + 2 H, O, whilst the barium salt of the acid R dissolves in
12 times its quantity of boiling water and crystallizes with 6 H, O.
The acid & forms with diazo compounds a series of valuable azo dyes, the shades
of which are bluer and purer than those of the corresponding dye stuffs of the
acid R.
EXAMPLE I.
9,3 kilos of aniline are transformed by means of 25 Kº muriatic acid and 7 K°
nitrite of soda into the diazo compound, and mixed with an alkaline solution of
36 K of ẞ naphtol & disulphonate of soda. The dye stuff separates in leaflets, it dyes
an orange red. If in this example the aniline is replaced by either:
107 TZ
Tal

page_text: Stuffs therefrom.
I, SYDNEY PITT, of Sutton, in the County of Surrey, Gentleman, (a communication
to me from abroad by Messrs. Leopold Cassella & Company, of Frankfort-on-Main, in
the Empire of Germany,) do hereby declare the nature of this invention and in what
manner the same is to be performed to be particularly described and ascertained in.
and by the following statement :-
I have found that the ẞ naphtolmonosulphonic acid F described in the Provisional
and Complete Specifications of an application lodged on October 9th 1886 No. 12908
can be transformed by further sulphonation into a new disulphonic acid which I name
ẞ naphtol & disulphonic acid.
In order to obtain this new acid I proceed as follows: I introduce 50 kilos of
F naphtolmonosulphonate of soda into 100 kilos sulphuric acid of 66° Bé. at 120°-
140° C., and keep the temperature at 120° C. until a sample combined with diazo-
naphtaline produces a claret red, which is of bluer shade than the known Bordeaux R.
The operation lasts about 12 hours.
When
In place of the sulphuric acid of 66° Bé. weaker acids may be used.
fuming sulphuric acid is used or other sulphonating agents (pyrosulphate &c.) the
temperature is kept at a lower point and the sulphonation is sooner terminated.
The melt diluted with water is saturated with lime, and the lime salt is transformed
by addition of soda to the filtered solution into the sodium salt. The latter is easily
soluble in water, difficultly in spirit-the aqueous solution has a greenish fluorescence,
the solution can be used directly for the production of azo colours. If however the
acid is to be separated in form of a pure combination, it is best to use the barium salt
which is very difficultly soluble in boiling water. For this purpose I mix the sodium
salt with a solution of an equivalent quantity of chlorhydrate of barium, heat to the
boil and filter the separated yellowish white salt of baryta.
The known naphtoldisulphonic acids are not formed in sulphonating the acid F.
Compared with the disulphonic acid known as acid R the acid 8 shows the same
differences, as the acid F compared with the naphtolmonosulphonic acid of Schaeffer.
Diazonaphtaline and acid & for instance produce a violet crystalline precipitate, whilst
diazonaphtaline and acid R produce a brownish-red voluminous precipitate. The so-
called acid G-in its pure state named acid y-does not as is known, combine with
diazonaphtaline in aqueous solution.
The barium salt of the acid & dissolves in 185 times its quantity of boiling water.
он
and crystallizes in small prisms of the formula. C₁ H. (S03), Ba + 4 H₂O, whilst
the barium salt of the acid I dissolves in 12 times its quantity of boiling water and
crystallizes with 6 H₂O.
The acid forms with diazo compounds a series of valuable azo dyes, the shades
of which are bluer and purer than those of the corresponding dye stuffs of the
acid R.

page_text: also blue dye stuffs are produced.
These dye stuffs show a characteristical difference from the corresponding dye-stuffs
hitherto produced from naphtoldisulphonic acids by their greenish shades and their
affinity to the cotton fibre.
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:
1. The method of sulphonating F-naphtolmonosulphonic acid, substantially as
herein described.
2. As a new article of manufacture the B-naphtoldisulphonic acid, which I call
B-naphtol & disulphonic acid.
3. As new articles of manufacture the azo colours produced substantially as herein
described from ẞ naphtol & disulphonic acid either crude or purified.
Dal AL: IL
T
1000
CARPMAEL & Co.,
Agents for the Applicant.