Year: 1885

page_text: I, HENRY HARRIS LAKE, of the firm of Haseltine, Lake, and Co, Patent Agents,
Southampton Buildings, in the County of Middlesex 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 :-
This invention has reference.
Firstly To the production of a new napthol disulphonic acid.
Secondly To the manufacture of yellow, yellow scarlets, red scarlets and Bordeaux
dye stuffs from said new naphthol-disulphonic acid, by the action of nitric acid and
of diazo compounds produced from Aniline, Toluidine, Xylidine, Amidoazobenzole,
Amidoazotoluole, Napthylamine, and the corresponding sulphonic acids.
In the production of the new disulphonic acid one hundred (100) parts by weight
of alpha naphthaline monosulphonic acid (which acid is made in the well known
nanner) are mixed with two hundred (200) parts of sulphuric acid of 66 degrees
Baumé. To this mixture are then added forty five (45) parts of nitric acid of
40 degrees Baumé, whereby two Naphthaline mononitro-sulphonic acids are formed.
These acids are converted into their amido compounds, which conversion results in.
two new naphthylamine sulphonic acids. These acids are easily separated owing
to the unequal solubility of their salts in water. The naphthylamine sulphonic
acid which forms a sodium salt not easily soluble in water is converted into the
diazo compound by a solution of sodium nitrite in the following manner. Two
hundred and forty five parts of the sodium salt of said acid are dissolved in two
thousand parts of water and to this solution are added 250 parts of sulphuric acid
of 50 degrees Baumé. The solution is then cooled to about 6 degrees Centigrade
and sixty nine (69) parts of sodium nitrite dissolved in about seven hundred (700)
pounds of water are added slowly. This mixture is then allowed to rest for several
hours. This diazo compound is introduced into a boiling liquid composed of one
thousand (1000) parts of water and one hundred and fifty (150) parts of sulphuric
acid, whereby the diazo compound is broken up and a new naphthol-monosulphonic
acid is produced. This last acid is the raw material for the production of the new
naphthol disulphonic acid,

page_text: By replacing in process the Xylidine by Aniline Orange is obtained; and by
replacing it by toluidine, a yellow scarlet colour is obtained.
4. PROCESS FOR PRODUCING AN INTENSELY RED-SCARLET.
One hundred and thirty three (133) pounds of hydrochlorate of amidoazobenzole
in the condition of a fine powder. or fine crystals are mixed with three hundred
(300) pounds, of hydrochloric acid, the mixture is then diluted with two thousand
(2000) pounds of water and cooled down to 5 degrees Centigrade., A solution of
seventy (70) pounds of sodium nitrite is then slowly poured into the mixture.
When the diazo compound is formed it is slowly poured into a solution of three
hundred and forty eight (348) pounds of the sodium salt, of the new disulphonic

page_text: acid. Alkali must be present throughout the whole operation. The dye-stuff is
precipitated out of its solution by common salt and purified by again dissolving
and precipitating it.
5. PROCESS OF PRODUCING A DEEP RED-SCARLET AND BORDEAUX COLOURS.
By replacing in process N° 4 the amidoazobenzole by anidoazotoluole a scarlet
colour of a deep red shade is obtained and by replacing in the same process the
amidoazobenzole by naphthylamine a Bordeaux colour will be obtained.
Having now particularly described and ascertained the nature of the said
invention, and in what manner the same is to be performed as communicated to
me by my foreign Correspondents I declare that what I claim is
First. A colour producing acid consisting of the herein described naphthol-
disulphonic acid substantially as set forth.
•
Second. The herein described yellow and red dye stuffs, being derivatives of the
said naphthol-disulphonic acid, substantially as set forth.
Dated this 22nd day of December 1885
HASELTINE, LAKE & Co.,
For the Applicant.