Year: 1885

page_text: I, HENRY HARRIS LAKE, of the firm of Haseltine, Lake & 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 par-
ticularly described and ascertained in and by the following statement:-
This invention has for its object
Firstly; The production of a new naphthol-monosulphonic acid, and
Secondly; The manufacture of red and yellow dye-stuffs from said new naphthol-
monosulphonic acid by the action of diazo compounds produced from Aniline,
Poluidine, Xylidine, alpha and beta naphthylamine and the corresponding sulphonic
acids and from the sulphonic acids of Amidoazobenzole and the homologues.
In producing the new naphthol-monosulphonic acid 100 parts by weight of the
alpha naphthaline-monosulphonic acid (which acid is made in the well known
manner) are mixed with two hundred (200) parts of sulphuric acid of 66 degrees
Baumé. To this mixture is then added forty five (45) pounds of nitric acid of
40 degrees Baumé whereby two naphthaline-mononitro-monosulphonic 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 acid which forms a
sodium salt easily soluble in water is the raw material for the production of the
new naphthol-monosulphonic acid. Two hundred and forty five (245) pounds of
the sodium salt of said naphthylamine-sulphonic acid are dissolved in four
thousand (4000) pounds of water and to it are added one hundred and fifty (150)
pounds of sulphuric acid of 66 degrees Baumé. The mixture is cooled down to
about 5 degrees centigrade and seventy (70) pounds of sodium nitrite dissolved in
three hundred (300) pounds of water is slowly added. The mixture is left at rest
for twenty four hours. It is then poured slowly into boiling water to which one
hundred and fifty (150) pounds of sulphuric acid of 50 degrees Baumé aré added,
whereby the diazo compound is broken up. and the new naphthol-monosulphonic
acid is formed. The soda salt of this new acid is now prepared in the usual
manner and can be used directly for producing colouring matters.

page_text: This new colour producing acid shews characteristic differences from all hitherto
known naphthol-monosulphonic acids principally by reaction upon the diazo
compounds of the benzole series and upon alpha and beta naphthylamine. All
known naphthol-monosulphonic acids produce when combined with diazobenzole
an orange colour, and when combined with diazotoluole an orange colour having
red shade; while this new acid produces with diazobenzole a bright yellowish
scarlet, and with diazotoluole an intensely red scarlet colour.
a
The manufacture of colouring matters from said new naphthol-monosulphonic
acids is as follows;-
1. Process for producing yellow scarlet.
Ninety three (93) pounds of aniline are dissolved in three hundred (300) pounds
of hydrochloric acid and to this solution are added about four thousand (4000)
pounds of water. The mixture is then cooled down to 5 degrees centigrade and
into it is slowly poured a solution of seventy (70) pounds of sodium nitrite.
When the diazo compound is formed it is slowly poured into a solution of two
hundred and sixty eight (268) pounds of the sodium salt of said new acid: Alkali
must be present throughout the whole operation. The new dye-stuff is precipi-
tated out of its solution by common salt and purified by again dissolving and
precipitating it.
2. Process for producing red scarlet.
By replacing in process 1., the aniline by its higher homologues red scarlet
colours are obtained.
3. Process for producing an intensely red scarlet..
One hundred and ninety (190) pounds of toluidine sulphonic acid are dissolved
in two thousand (2000) pounds of water, and to this three hundred (300) pounds
of hydrochloric acid are added. The mixture is then cooled down to about
5 degrees centigrade and into it is poured a solution of seventy (70) pounds of
sodium nitrite. When the diazo compound is formed it is poured into a solution
of two hundred and sixty eight (268) pounds of the sodium salt of said new acid..
Alkali must be present throughout the whole operation for neutralization. The
new dye-stuff is precipitated out of its solution by common salt and purified by
again dissolving and precipitating it.
4. Process for producing red scarlet colours.
By replacing in process 3., the toluidine sulphonic acid by the sulphonic acids of
aniline, xylidine, alpha and beta naphthylamine, bright scarlet colours of different
shades are produced.
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 berein described naphthol-
monosulphonic acid, substantially as set forth.
Second The herein described red and yellow dye-stuffs, being derivatives of
said naphthol monosulphonic acid, substantially as set forth.
Dated this 22nd day of December 1885.
HASELTINE, LAKE & Co.,
For the Applicant.